Jaehyun Hur - Academia.edu (original) (raw)
Papers by Jaehyun Hur
Batteries
Aqueous rechargeable zinc-ion batteries (ARZIBs) are potential candidates for grid-scale energy s... more Aqueous rechargeable zinc-ion batteries (ARZIBs) are potential candidates for grid-scale energy storage applications. In addition to its reversible chemistry in aqueous electrolytes, Zn metal is stable in water and air. However, there are critical challenges, such as non-uniform plating, hydrogen evolution, corrosion, and the formation of a passivation layer, which must be addressed before practical applications. In this study, the surface of Zn metal was coated with room-temperature bulk liquid-metal and liquid-metal nanoparticles to facilitate the uniform plating of Zn–ions during cycling. A simple probe ultrasonication method was used to prepare the liquid-metal nanoparticles, and a nanoparticle suspension film was formed through spin coating. At an areal capacity and current density of 0.5 mAh cm−2 and 0.5 mA cm−2, respectively, symmetric cells composed of bare Zn metal electrodes were prone to short-circuiting after ~45 h of deposition/striping cycles. However, under the same o...
Applied Materials Today
Abstract Carbon-free niobium silicide (NbSi2)-based composites, starting from silicon monoxide an... more Abstract Carbon-free niobium silicide (NbSi2)-based composites, starting from silicon monoxide and niobium metal elements, are synthesized by a simple top-down approach with a high-energy mechanical milling process facilitating the manufacture of nanosized materials, and are employed as anode materials for lithium-ion batteries. The final product has three phases comprising Nb, NbSi2, and Nb2O5, whose structures and morphologies are thoroughly examined using advanced characterization techniques. Although the as-prepared Nb/NbSi2@Nb2O5 composites do not contain carbon, the volume expansion is mitigated during the (de)alloying process with Li ions and the composites possess good electrical conductivity. The carbon-free Nb/NbSi2@Nb2O5 composites, specifically the Nb/NbSi2@Nb2O5 (2:8 & 3:7) electrodes, exhibit stable electrochemical performance (430 & 400 mAh g−1 after 300 cycles) as well as remarkable rate performance with discharge capacities of 699 & 491 mAh g−1 at a high current density of 10 A g−1 with 86 & 80% of normalized capacity retentions. This noticeable improvement can be due to the presence of Nb in the NbSi2 phase and the amorphous Nb2O5 matrix in the composites, which provide high electrical conductivity (for Nb) in addition to forming stable structural stability (for Nb and Nb2O5). Therefore, the novel Nb/NbSi2@Nb2O5 composites presented here provide potential for viable application in high-performance anodes for lithium-ion cells.
Nanomaterials
C-decorated intermetallic InSb (InSb–C) was developed as a novel high-performance anode material ... more C-decorated intermetallic InSb (InSb–C) was developed as a novel high-performance anode material for lithium-ion batteries (LIBs). InSb nanoparticles synthesized via a mechanochemical reaction were characterized using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray spectroscopy (EDX). The effects of the binder and buffering matrix on the active InSb were investigated. Poly(acrylic acid) (PAA) was found to significantly improve the cycling stability owing to its strong hydrogen bonding. The addition of amorphous C to InSb further enhanced mechanical stability and electronic conductivity. As a result, InSb–C demonstrated good electrochemical Li-ion storage performance: a high reversible specific capacity (878 mAh·g−1 at 100 mA·g−1 after 140 cycles) and good rate capability (capacity retention of 98% at 10 A·g−1 as compared to 0.1 A·g−1). The effect...
Nanomaterials
Nanomaterials offer opportunities to improve battery performance in terms of energy density and e... more Nanomaterials offer opportunities to improve battery performance in terms of energy density and electrochemical reaction kinetics owing to a significant increase in the effective surface area of electrodes and reduced ion diffusion pathways [...]
Nanomaterials, 2021
An AlGaN/GaN heterostructure based hydrogen sensor was fabricated using a dual catalyst layer wit... more An AlGaN/GaN heterostructure based hydrogen sensor was fabricated using a dual catalyst layer with ZnO-nanoparticles (NPs) atop of Pd catalyst film. The ZnO-NPs were synthesized to have an average diameter of ~10 nm and spin coated on the Pd catalyst layer. Unlike the conventional catalytic reaction, the fabricated sensors exhibited room temperature operation without heating owing to the photocatalytic reaction of the ZnO-NPs with ultraviolet illumination at 280 nm. A sensing response of 25% was achieved for a hydrogen concentration of 4% at room temperature with fast response and recovery times; a response time of 8 s and a recovery time of 11 s.
Materials, 2021
Owing to their intrinsic properties, such as deformability, high electrical conductivity, and sup... more Owing to their intrinsic properties, such as deformability, high electrical conductivity, and superior electrochemical performance, room-temperature liquid metals and liquid metal alloys have attracted the attention of researchers for a wide variety of applications, including portable and large-scale energy storage applications. In this study, novel gallium-indium-tin eutectic (EGaInSn) room-temperature liquid metal nanoparticles synthesized using a facile and scalable probe-ultrasonication method were used as anode material in lithium-ion batteries. The morphology, geometry, and self-healing properties of the synthesized room-temperature liquid metal nanoparticles were characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) with energy-dispersive X-ray spectroscopy (SEM/EDS and TEM/EDS). The synthesized room-temperature liquid metal nanoparticles delivered a specific capacity of 474 mAh g–1 and retained 77% of the stable reversible capacity...
Nanomaterials, 2021
To enhance the performance of lithium-ion batteries, zinc oxide (ZnO) has generated interest as a... more To enhance the performance of lithium-ion batteries, zinc oxide (ZnO) has generated interest as an anode candidate owing to its high theoretical capacity. However, because of its limitations such as its slow chemical reaction kinetics, intense capacity fading on potential cycling, and low rate capability, composite anodes of ZnO and other materials are manufactured. In this study, we introduce binary and ternary composites of ZnO with other metal oxides (MOs) and carbon-based materials. Most ZnO-based composite anodes exhibit a higher specific capacity, rate performance, and cycling stability than a single ZnO anode. The synergistic effects between ZnO and the other MOs or carbon-based materials can explain the superior electrochemical characteristics of these ZnO-based composites. This review also discusses some of their current limitations.
Applied Surface Science, 2021
Recently, ZnO-based photodetectors have gained immense attention for ultraviolet detection applic... more Recently, ZnO-based photodetectors have gained immense attention for ultraviolet detection applications owing to their abundance and cost-effective synthesis. However, low responsivity, slow speed, and complicated fabrication limit the applications of these detectors. Herein, we report a high-performance UV photodiode based on n-type graphene quantum dot-decorated ZnO (ZnO:GQD) and p-type poly(N,N'-bis-4-butylphenyl-N,N'-bisphenyl)benzidine (Poly-TPD) heterojunction. First, we demonstrate the incorporation of GQD in ZnO not only reduces the ZnO surface roughness and ZnO nanoparticle size but also promotes the transport of photogenerated carriers and increases the charge lifetime of ZnO. The effect of GQD content on the physical and chemical characteristics of the ZnO film is investigated using Raman spectroscopy, XRD, SEM, AFM, UV-vis spectroscopy, and PL. Second, under the appropriate GQD concentration condition, the performances of various ZnO:GQDbased devices are compared to understand the charge transport mechanism. As a result, the photodiode based on ZnO:GQD/Poly-TPD shows the most balanced energy structure, enhanced mobility, and alleviation in charge recombination relative to the other devices. The ZnO:GQD/Poly-TPD photodetector exhibits excellent performance under 365-nm UV illumination: a rise/decay time of 0.37/0.78 s and a specific × detectivity of 2.1 10 11 Jones (at −3 V bias) with outstanding stability at least for 10 weeks without significant photocurrent degeneration.
Applied Surface Science, 2021
Abstract Floating photocatalysts (FPCs) have recently attracted considerable interest for water t... more Abstract Floating photocatalysts (FPCs) have recently attracted considerable interest for water treatment owing to their uniform light utilization regardless of their location in water and facile recycling. Various materials (e.g., polystyrene, silica gel, and glass) have been explored as self-floating substrates; however, these materials have certain limitations such as a low light transmittance, mechanical instability during floating, and insufficient adhesion with the active photocatalyst nanoparticles (NPs). Herein, we propose three-dimensionally interconnected porous poly(dimethylsiloxane) (3D-p-PDMS) as a new potential self-floating substrate with high transparency, elasticity, and chemical stability for FPCs. 3D-p-PDMS was fabricated using sacrificial alginate hydrogel beads, which could be easily removed by heat treatment. On the internal surface of 3D-p-PDMS, Prussian blue (PB) NPs were conformally deposited using polydopamine (PDA) as an adhesion-promoting layer (3D-p-PDMS@PDA@PB). The 3D-p-PDMS@PDA@PB photocatalyst can be a promising solar-active photo-Fenton catalyst because of its broadband absorbance and the presence of iron (in PB), along with its excellent mechanical and optical properties. With optimized conditions (pore size and density), 3D-p-PDMS@PDA@PB showed a high photo-Fenton performance for degrading model dye contaminants (methylene blue, methyl orange, and Congo red). Furthermore, 3D-p-PDMS@PDA@PB exhibited excellent recyclability and an insignificant decrease in photo-Fenton activity over five cycles of reuse.
Energy Storage Materials, 2021
Selfhealing gallium phosphide embedded in a hybrid matrix for high-performance Li-ion batteries, ... more Selfhealing gallium phosphide embedded in a hybrid matrix for high-performance Li-ion batteries, Energy Storage Materials (2020), doi:
Journal of Nanoscience and Nanotechnology, 2021
In this study, a UVC sensor was implemented using CH3NH3PbI3, a perovskite material. The UV senso... more In this study, a UVC sensor was implemented using CH3NH3PbI3, a perovskite material. The UV sensor made with a p–i–n structure uses PEDOT:PSS as the p-type material and ZnO as the n-type material. The fabricated device shows a responsivity of 1.60 mA/W and a detectivity of 2.25×1010 Jones under 254 nm illumination with a power density of 1.02 mW/cm2 at 2 V. In addition, the manufactured UV sensor is a self-powered perovskite-based UV sensor that can operate without external bias. Therefore, this UVC sensor can have applications in various fields.
Journal of Nanoscience and Nanotechnology, 2020
Titanium dioxide (TiO2) is a semiconductor photocatalyst widely applied in numerous fields due to... more Titanium dioxide (TiO2) is a semiconductor photocatalyst widely applied in numerous fields due to possessing prominent photocatalytic properties. However, its practical applications in the form of nanoparticles or powders still have remained several limitations. Recently, novel photocatalytic porous composites have been discovered to be potential alternative approaches. In the present study, nanostructured magnesium-aminoclay-based TiO2 (MgAC–TiO2) was successfully deposited on an activated carbon fiber (ACF) matrix using the sol–gel approach followed by calcination at 350°C in an air atmosphere. The structure and photocatalytic activity of this as-prepared photocatalyst composite were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), the Brunauer-Emmett-Teller (BET), and UV-vis diffuse reflectance spectral analysis. The photocatalytic activity of MgAC–TiO2/ACF was investigated under batch conditions for the removal of methylene blue (MB) i...
Korean Journal of Chemical Engineering, 2020
Cellulose (CNC) has smoother surfaces, better optical transparency and higher mechanical strength... more Cellulose (CNC) has smoother surfaces, better optical transparency and higher mechanical strength in comparison with various cellulose fibers. These properties combined with their low cost, light weight, and flexiblility indicate CNC's great potential as an attractive candidate for preparation of carbon materials, which can be promising electrode for Lithium-ion batteries. However, CNC cannot be directly used in battery fabrication because of its electrically non-conductive property. Wherefore, using pyrolysis to convert CNC into conductive materials is extensively investigated. In our study, high temperature range is used to convert nanocrystalline cellulose into highly conductive carbon material and used in Lithium-ion batteries. The nanocellulose powder after pyrolysis from 800 o C and 1,600 o C is used as active material in Lithium-ion battery electrodes, and the results obtained show a good electrochemical performance with stable cycling capacity. Following, the carbon network obtained through the pyrolysis (800 o C and 1,600 o C) of nanocrystalline cellulose incorporation with tin dioxide (SnO 2) was also used as electrode material in Lithium-ion batteries, resulting in stability, outstanding capacity and better performance in comparison with other carbon-based materials.
Journal of Nanoscience and Nanotechnology, 2020
A facile and scalable wet ball-milling method was employed to reduce the size of two-dimensional ... more A facile and scalable wet ball-milling method was employed to reduce the size of two-dimensional (2D) materials (MoS2, MoSe2 , and NbSe2) and distribute these particles on a graphite surface. Herein, we discuss the effects of graphite matrix addition on the performance of each of the 2D materials prepared via a wet ball-milling process, and demonstrate that these composites can be used as high-performance anode materials for sodium-ion batteries. As compared to the MoSe2@graphite and NbSe2@graphite composites, the MoS2@graphite electrode exhibited superior electrochemical performance, with high specific capacity (i.e., ~300 mAh g−1 after 100 cycles, corresponding to ~77% of charge capacity retention relative to the initial charge capacity), high cyclic stability, and excellent rate capability (~85% capacity retention at 10 A g−1 relative to the capacity at 0.1 A g−1).
Applied Surface Science, 2019
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Chemical Engineering Journal, 2019
• Few-layer NbSe 2 @graphene heterostructure was synthesized via wet milling. • Effectiveness of ... more • Few-layer NbSe 2 @graphene heterostructure was synthesized via wet milling. • Effectiveness of wet milling to form few-layer NbSe 2 @graphene was firstly studied. • Phase transition, conversion, and Li intercalation of NbSe 2 @graphene were studied. • NbSe 2 @graphene showed great cyclic life and rate performance in half and full cell.
Nanomaterials, 2019
Synergism between the alloy materials and the carbon support matrix, in conjunction with the bind... more Synergism between the alloy materials and the carbon support matrix, in conjunction with the binder and electrolyte additives, is of utmost importance when developing sodium-ion batteries as viable replacements for lithium-ion batteries. In this study, we demonstrate the importance of the binder and carbon support matrix in enhancing the stabilities, cyclabilities, and capacity retentions of bimetallic anodes in sodium-ion batteries. SbTe electrodes containing 20%, 30%, and 40% carbon were fabricated with polyvinylidene fluoride (PVDF) and polyacrylic acid (PAA) binders, and electrochemically evaluated at a current rate of 100 mA g−1 using electrolytes with 0%, 2%, and 5% added fluoroethylene carbonate (FEC). The electrodes with the PVDF binder in cells with 5% FEC added to the electrolyte showed capacity retentions that increased with increasing carbon percentage, delivering reversible capacities of 34, 69, and 168 mAh g−1 with 20%, 30%, and 40% carbon; these electrodes retained 8....
Journal of Nanoscience and Nanotechnology, 2019
Zinc selenide-based hybrid carbon composites were synthesized by a high-energy mechanical milling... more Zinc selenide-based hybrid carbon composites were synthesized by a high-energy mechanical milling process under an Ar atmosphere. The as-synthesized ZnSe-based carbon composites were characterized by X-ray diffraction and transmission electron microscopy. First, we examined the effect of single-component carbon matrices on the electrochemical performance of ZnSe. The results showed the best performance for graphite (G), followed by carbon nanotubes (CNTs), and amorphous carbon. Based on these results, in order to further enhance the performance of ZnSe, we introduced a binary-carbon matrix consisting of graphite and CNTs at various ratios of 1:1, 1:3, and 3:1, respectively. As a result, ZnSe@G/CNT (1:3) exhibited the best performance in terms of cyclic life and rate capability. Specifically, ZnSe@G/CNT (1:3) delivered a specific capacity of 1041 mAh g −1 at a current density of 100 mA g −1 after 300 cycles with a coulombic efficiency of over 99% with high rate performance.
Journal of Energy Chemistry, 2018
Surface and chemical diffusion effects of nanowire electrodes in lithium-ion batteries SCIENCE CH... more Surface and chemical diffusion effects of nanowire electrodes in lithium-ion batteries SCIENCE CHINA Technological Sciences Carbon matrix/SiNWs heterogeneous block as improved reversible anodes material for lithium ion batteries
Batteries
Aqueous rechargeable zinc-ion batteries (ARZIBs) are potential candidates for grid-scale energy s... more Aqueous rechargeable zinc-ion batteries (ARZIBs) are potential candidates for grid-scale energy storage applications. In addition to its reversible chemistry in aqueous electrolytes, Zn metal is stable in water and air. However, there are critical challenges, such as non-uniform plating, hydrogen evolution, corrosion, and the formation of a passivation layer, which must be addressed before practical applications. In this study, the surface of Zn metal was coated with room-temperature bulk liquid-metal and liquid-metal nanoparticles to facilitate the uniform plating of Zn–ions during cycling. A simple probe ultrasonication method was used to prepare the liquid-metal nanoparticles, and a nanoparticle suspension film was formed through spin coating. At an areal capacity and current density of 0.5 mAh cm−2 and 0.5 mA cm−2, respectively, symmetric cells composed of bare Zn metal electrodes were prone to short-circuiting after ~45 h of deposition/striping cycles. However, under the same o...
Applied Materials Today
Abstract Carbon-free niobium silicide (NbSi2)-based composites, starting from silicon monoxide an... more Abstract Carbon-free niobium silicide (NbSi2)-based composites, starting from silicon monoxide and niobium metal elements, are synthesized by a simple top-down approach with a high-energy mechanical milling process facilitating the manufacture of nanosized materials, and are employed as anode materials for lithium-ion batteries. The final product has three phases comprising Nb, NbSi2, and Nb2O5, whose structures and morphologies are thoroughly examined using advanced characterization techniques. Although the as-prepared Nb/NbSi2@Nb2O5 composites do not contain carbon, the volume expansion is mitigated during the (de)alloying process with Li ions and the composites possess good electrical conductivity. The carbon-free Nb/NbSi2@Nb2O5 composites, specifically the Nb/NbSi2@Nb2O5 (2:8 & 3:7) electrodes, exhibit stable electrochemical performance (430 & 400 mAh g−1 after 300 cycles) as well as remarkable rate performance with discharge capacities of 699 & 491 mAh g−1 at a high current density of 10 A g−1 with 86 & 80% of normalized capacity retentions. This noticeable improvement can be due to the presence of Nb in the NbSi2 phase and the amorphous Nb2O5 matrix in the composites, which provide high electrical conductivity (for Nb) in addition to forming stable structural stability (for Nb and Nb2O5). Therefore, the novel Nb/NbSi2@Nb2O5 composites presented here provide potential for viable application in high-performance anodes for lithium-ion cells.
Nanomaterials
C-decorated intermetallic InSb (InSb–C) was developed as a novel high-performance anode material ... more C-decorated intermetallic InSb (InSb–C) was developed as a novel high-performance anode material for lithium-ion batteries (LIBs). InSb nanoparticles synthesized via a mechanochemical reaction were characterized using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray spectroscopy (EDX). The effects of the binder and buffering matrix on the active InSb were investigated. Poly(acrylic acid) (PAA) was found to significantly improve the cycling stability owing to its strong hydrogen bonding. The addition of amorphous C to InSb further enhanced mechanical stability and electronic conductivity. As a result, InSb–C demonstrated good electrochemical Li-ion storage performance: a high reversible specific capacity (878 mAh·g−1 at 100 mA·g−1 after 140 cycles) and good rate capability (capacity retention of 98% at 10 A·g−1 as compared to 0.1 A·g−1). The effect...
Nanomaterials
Nanomaterials offer opportunities to improve battery performance in terms of energy density and e... more Nanomaterials offer opportunities to improve battery performance in terms of energy density and electrochemical reaction kinetics owing to a significant increase in the effective surface area of electrodes and reduced ion diffusion pathways [...]
Nanomaterials, 2021
An AlGaN/GaN heterostructure based hydrogen sensor was fabricated using a dual catalyst layer wit... more An AlGaN/GaN heterostructure based hydrogen sensor was fabricated using a dual catalyst layer with ZnO-nanoparticles (NPs) atop of Pd catalyst film. The ZnO-NPs were synthesized to have an average diameter of ~10 nm and spin coated on the Pd catalyst layer. Unlike the conventional catalytic reaction, the fabricated sensors exhibited room temperature operation without heating owing to the photocatalytic reaction of the ZnO-NPs with ultraviolet illumination at 280 nm. A sensing response of 25% was achieved for a hydrogen concentration of 4% at room temperature with fast response and recovery times; a response time of 8 s and a recovery time of 11 s.
Materials, 2021
Owing to their intrinsic properties, such as deformability, high electrical conductivity, and sup... more Owing to their intrinsic properties, such as deformability, high electrical conductivity, and superior electrochemical performance, room-temperature liquid metals and liquid metal alloys have attracted the attention of researchers for a wide variety of applications, including portable and large-scale energy storage applications. In this study, novel gallium-indium-tin eutectic (EGaInSn) room-temperature liquid metal nanoparticles synthesized using a facile and scalable probe-ultrasonication method were used as anode material in lithium-ion batteries. The morphology, geometry, and self-healing properties of the synthesized room-temperature liquid metal nanoparticles were characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) with energy-dispersive X-ray spectroscopy (SEM/EDS and TEM/EDS). The synthesized room-temperature liquid metal nanoparticles delivered a specific capacity of 474 mAh g–1 and retained 77% of the stable reversible capacity...
Nanomaterials, 2021
To enhance the performance of lithium-ion batteries, zinc oxide (ZnO) has generated interest as a... more To enhance the performance of lithium-ion batteries, zinc oxide (ZnO) has generated interest as an anode candidate owing to its high theoretical capacity. However, because of its limitations such as its slow chemical reaction kinetics, intense capacity fading on potential cycling, and low rate capability, composite anodes of ZnO and other materials are manufactured. In this study, we introduce binary and ternary composites of ZnO with other metal oxides (MOs) and carbon-based materials. Most ZnO-based composite anodes exhibit a higher specific capacity, rate performance, and cycling stability than a single ZnO anode. The synergistic effects between ZnO and the other MOs or carbon-based materials can explain the superior electrochemical characteristics of these ZnO-based composites. This review also discusses some of their current limitations.
Applied Surface Science, 2021
Recently, ZnO-based photodetectors have gained immense attention for ultraviolet detection applic... more Recently, ZnO-based photodetectors have gained immense attention for ultraviolet detection applications owing to their abundance and cost-effective synthesis. However, low responsivity, slow speed, and complicated fabrication limit the applications of these detectors. Herein, we report a high-performance UV photodiode based on n-type graphene quantum dot-decorated ZnO (ZnO:GQD) and p-type poly(N,N'-bis-4-butylphenyl-N,N'-bisphenyl)benzidine (Poly-TPD) heterojunction. First, we demonstrate the incorporation of GQD in ZnO not only reduces the ZnO surface roughness and ZnO nanoparticle size but also promotes the transport of photogenerated carriers and increases the charge lifetime of ZnO. The effect of GQD content on the physical and chemical characteristics of the ZnO film is investigated using Raman spectroscopy, XRD, SEM, AFM, UV-vis spectroscopy, and PL. Second, under the appropriate GQD concentration condition, the performances of various ZnO:GQDbased devices are compared to understand the charge transport mechanism. As a result, the photodiode based on ZnO:GQD/Poly-TPD shows the most balanced energy structure, enhanced mobility, and alleviation in charge recombination relative to the other devices. The ZnO:GQD/Poly-TPD photodetector exhibits excellent performance under 365-nm UV illumination: a rise/decay time of 0.37/0.78 s and a specific × detectivity of 2.1 10 11 Jones (at −3 V bias) with outstanding stability at least for 10 weeks without significant photocurrent degeneration.
Applied Surface Science, 2021
Abstract Floating photocatalysts (FPCs) have recently attracted considerable interest for water t... more Abstract Floating photocatalysts (FPCs) have recently attracted considerable interest for water treatment owing to their uniform light utilization regardless of their location in water and facile recycling. Various materials (e.g., polystyrene, silica gel, and glass) have been explored as self-floating substrates; however, these materials have certain limitations such as a low light transmittance, mechanical instability during floating, and insufficient adhesion with the active photocatalyst nanoparticles (NPs). Herein, we propose three-dimensionally interconnected porous poly(dimethylsiloxane) (3D-p-PDMS) as a new potential self-floating substrate with high transparency, elasticity, and chemical stability for FPCs. 3D-p-PDMS was fabricated using sacrificial alginate hydrogel beads, which could be easily removed by heat treatment. On the internal surface of 3D-p-PDMS, Prussian blue (PB) NPs were conformally deposited using polydopamine (PDA) as an adhesion-promoting layer (3D-p-PDMS@PDA@PB). The 3D-p-PDMS@PDA@PB photocatalyst can be a promising solar-active photo-Fenton catalyst because of its broadband absorbance and the presence of iron (in PB), along with its excellent mechanical and optical properties. With optimized conditions (pore size and density), 3D-p-PDMS@PDA@PB showed a high photo-Fenton performance for degrading model dye contaminants (methylene blue, methyl orange, and Congo red). Furthermore, 3D-p-PDMS@PDA@PB exhibited excellent recyclability and an insignificant decrease in photo-Fenton activity over five cycles of reuse.
Energy Storage Materials, 2021
Selfhealing gallium phosphide embedded in a hybrid matrix for high-performance Li-ion batteries, ... more Selfhealing gallium phosphide embedded in a hybrid matrix for high-performance Li-ion batteries, Energy Storage Materials (2020), doi:
Journal of Nanoscience and Nanotechnology, 2021
In this study, a UVC sensor was implemented using CH3NH3PbI3, a perovskite material. The UV senso... more In this study, a UVC sensor was implemented using CH3NH3PbI3, a perovskite material. The UV sensor made with a p–i–n structure uses PEDOT:PSS as the p-type material and ZnO as the n-type material. The fabricated device shows a responsivity of 1.60 mA/W and a detectivity of 2.25×1010 Jones under 254 nm illumination with a power density of 1.02 mW/cm2 at 2 V. In addition, the manufactured UV sensor is a self-powered perovskite-based UV sensor that can operate without external bias. Therefore, this UVC sensor can have applications in various fields.
Journal of Nanoscience and Nanotechnology, 2020
Titanium dioxide (TiO2) is a semiconductor photocatalyst widely applied in numerous fields due to... more Titanium dioxide (TiO2) is a semiconductor photocatalyst widely applied in numerous fields due to possessing prominent photocatalytic properties. However, its practical applications in the form of nanoparticles or powders still have remained several limitations. Recently, novel photocatalytic porous composites have been discovered to be potential alternative approaches. In the present study, nanostructured magnesium-aminoclay-based TiO2 (MgAC–TiO2) was successfully deposited on an activated carbon fiber (ACF) matrix using the sol–gel approach followed by calcination at 350°C in an air atmosphere. The structure and photocatalytic activity of this as-prepared photocatalyst composite were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), the Brunauer-Emmett-Teller (BET), and UV-vis diffuse reflectance spectral analysis. The photocatalytic activity of MgAC–TiO2/ACF was investigated under batch conditions for the removal of methylene blue (MB) i...
Korean Journal of Chemical Engineering, 2020
Cellulose (CNC) has smoother surfaces, better optical transparency and higher mechanical strength... more Cellulose (CNC) has smoother surfaces, better optical transparency and higher mechanical strength in comparison with various cellulose fibers. These properties combined with their low cost, light weight, and flexiblility indicate CNC's great potential as an attractive candidate for preparation of carbon materials, which can be promising electrode for Lithium-ion batteries. However, CNC cannot be directly used in battery fabrication because of its electrically non-conductive property. Wherefore, using pyrolysis to convert CNC into conductive materials is extensively investigated. In our study, high temperature range is used to convert nanocrystalline cellulose into highly conductive carbon material and used in Lithium-ion batteries. The nanocellulose powder after pyrolysis from 800 o C and 1,600 o C is used as active material in Lithium-ion battery electrodes, and the results obtained show a good electrochemical performance with stable cycling capacity. Following, the carbon network obtained through the pyrolysis (800 o C and 1,600 o C) of nanocrystalline cellulose incorporation with tin dioxide (SnO 2) was also used as electrode material in Lithium-ion batteries, resulting in stability, outstanding capacity and better performance in comparison with other carbon-based materials.
Journal of Nanoscience and Nanotechnology, 2020
A facile and scalable wet ball-milling method was employed to reduce the size of two-dimensional ... more A facile and scalable wet ball-milling method was employed to reduce the size of two-dimensional (2D) materials (MoS2, MoSe2 , and NbSe2) and distribute these particles on a graphite surface. Herein, we discuss the effects of graphite matrix addition on the performance of each of the 2D materials prepared via a wet ball-milling process, and demonstrate that these composites can be used as high-performance anode materials for sodium-ion batteries. As compared to the MoSe2@graphite and NbSe2@graphite composites, the MoS2@graphite electrode exhibited superior electrochemical performance, with high specific capacity (i.e., ~300 mAh g−1 after 100 cycles, corresponding to ~77% of charge capacity retention relative to the initial charge capacity), high cyclic stability, and excellent rate capability (~85% capacity retention at 10 A g−1 relative to the capacity at 0.1 A g−1).
Applied Surface Science, 2019
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Chemical Engineering Journal, 2019
• Few-layer NbSe 2 @graphene heterostructure was synthesized via wet milling. • Effectiveness of ... more • Few-layer NbSe 2 @graphene heterostructure was synthesized via wet milling. • Effectiveness of wet milling to form few-layer NbSe 2 @graphene was firstly studied. • Phase transition, conversion, and Li intercalation of NbSe 2 @graphene were studied. • NbSe 2 @graphene showed great cyclic life and rate performance in half and full cell.
Nanomaterials, 2019
Synergism between the alloy materials and the carbon support matrix, in conjunction with the bind... more Synergism between the alloy materials and the carbon support matrix, in conjunction with the binder and electrolyte additives, is of utmost importance when developing sodium-ion batteries as viable replacements for lithium-ion batteries. In this study, we demonstrate the importance of the binder and carbon support matrix in enhancing the stabilities, cyclabilities, and capacity retentions of bimetallic anodes in sodium-ion batteries. SbTe electrodes containing 20%, 30%, and 40% carbon were fabricated with polyvinylidene fluoride (PVDF) and polyacrylic acid (PAA) binders, and electrochemically evaluated at a current rate of 100 mA g−1 using electrolytes with 0%, 2%, and 5% added fluoroethylene carbonate (FEC). The electrodes with the PVDF binder in cells with 5% FEC added to the electrolyte showed capacity retentions that increased with increasing carbon percentage, delivering reversible capacities of 34, 69, and 168 mAh g−1 with 20%, 30%, and 40% carbon; these electrodes retained 8....
Journal of Nanoscience and Nanotechnology, 2019
Zinc selenide-based hybrid carbon composites were synthesized by a high-energy mechanical milling... more Zinc selenide-based hybrid carbon composites were synthesized by a high-energy mechanical milling process under an Ar atmosphere. The as-synthesized ZnSe-based carbon composites were characterized by X-ray diffraction and transmission electron microscopy. First, we examined the effect of single-component carbon matrices on the electrochemical performance of ZnSe. The results showed the best performance for graphite (G), followed by carbon nanotubes (CNTs), and amorphous carbon. Based on these results, in order to further enhance the performance of ZnSe, we introduced a binary-carbon matrix consisting of graphite and CNTs at various ratios of 1:1, 1:3, and 3:1, respectively. As a result, ZnSe@G/CNT (1:3) exhibited the best performance in terms of cyclic life and rate capability. Specifically, ZnSe@G/CNT (1:3) delivered a specific capacity of 1041 mAh g −1 at a current density of 100 mA g −1 after 300 cycles with a coulombic efficiency of over 99% with high rate performance.
Journal of Energy Chemistry, 2018
Surface and chemical diffusion effects of nanowire electrodes in lithium-ion batteries SCIENCE CH... more Surface and chemical diffusion effects of nanowire electrodes in lithium-ion batteries SCIENCE CHINA Technological Sciences Carbon matrix/SiNWs heterogeneous block as improved reversible anodes material for lithium ion batteries