Ankur Soam - Academia.edu (original) (raw)

Papers by Ankur Soam

Advanced Materials Proceedings, Apr 1, 2017

Russian Journal of Electrochemistry, 2020

Bismuth iron oxide (BFO) nanoparticles film prepared by electrophoretic deposition (EPD) process ... more Bismuth iron oxide (BFO) nanoparticles film prepared by electrophoretic deposition (EPD) process has been explored for supercapacitor application. EPD process has several benefits compared to other techniques such as vacuum free, controllability over nanofilms and suitable method to prepare electrodes. The structure of the as-deposited film was characterized using X-ray diffraction and high-resolution transmission electron microscopy. The morphology of the as-deposited BFO nanoparticles film was examined with scanning electron microscopy. Cyclic voltammetry and constant current charging/discharging methods were employed to study the electrochemical properties of BFO nanoparticles films. The BFO nanoparticles film exhibited a specific capacitance of 7.4 mF/cm2 determined at a scan rate of 10 mV/s.

Journal of Nanoparticle Research, 2020

The size of silicon nanowires (SiNWs) plays an important role for their application in nanoelectr... more The size of silicon nanowires (SiNWs) plays an important role for their application in nanoelectronic and nanophotonic systems. Therefore, it is of great interest to study the synthesis conditions of SiNWs in order to grow SiNWs with well-controlled manner to be integrated into a device. This paper includes a systematic study of the dependence of diameter and length of the SiNWs on the growth conditions. SiNWs were synthesized via vapor–liquid–solid (VLS) mechanism using a catalyst film of Sn nanoparticles on stainless steel (SS) substrate. The morphology and microstructure of SiNWs synthesized at different parameters were investigated with scanning electron microscopy and Raman spectroscopy. In this study, we have observed that there exists a minimum size of the catalyst to initiate the growth of SiNWs for a given set of process parameters. Furthermore, this work also addresses the difficulties associated with the growth of long SiNWs. Effect of filament temperature on the morpholo...

Applied Physics A, 2021

Bimagnetic α-Fe2O3/NiFe2O4 nanocomposite was synthesized via a simple and cost-effective approach... more Bimagnetic α-Fe2O3/NiFe2O4 nanocomposite was synthesized via a simple and cost-effective approach, and the effect of the annealing temperature on the nanocomposite properties was discussed. Structural characterizations confirm the formation of α-Fe2O3/NiFe2O4 nanocomposite. Transmission electron microscope (TEM) characterization reveals the bimodal distribution of particles in the nanocomposites. Thermal annealing favours for the improvement of phase fraction along with the structural phase transformation of NiFe2O4 phase. Existence of percolation threshold phase fraction of NiFe2O4 in the composite sample could be responsible for the enhancement of optical band gap and magnetization. Beyond the percolation phase fraction, the magnetization decreased along with the coercivity and exchange bias. The appearance of enhanced optical property, single domain structure, ferromagnetic behaviour and high-energy product suggests the usefulness of the sample for photocatalyst, magnetic sensor and magnetic refrigerator applications.

International Journal of Nano and Biomaterials, 2017

Lanthanum complex Bis (5-choloro-8hydroxyquinoline) (2-2'bipyridine) lanthanum La(Bpy) (5-Clq) 2 ... more Lanthanum complex Bis (5-choloro-8hydroxyquinoline) (2-2'bipyridine) lanthanum La(Bpy) (5-Clq) 2 has been synthesised and characterised for its structural, thermal and photoluminescence analysis. Structure analysis of the complex was performed by Fourier transformed infrared spectroscopy (FTIR). Thermal analysis of the lanthanum complex was done by thermal gravimetric analysis (TGA) and complex is stable up to 370°C. Absorption and emission spectra of the complex was measured by UV-visible spectroscopy and photoluminescence spectroscopy, respectively. Solution of this complex in ethanol showed two absorption peaks at 402 and 334 nm, which may be attributed due to (π-π*) transitions. The photoluminescence spectra of La(Bpy)(5-Clq) 2 in ethanol solution showed intense peak at 510 nm.

Journal of Energy Storage, 2021

Inorganic Chemistry Communications, 2021

Journal of Inorganic and Organometallic Polymers and Materials, 2020

In the present work, Nickel ferrite and graphene nanocomposite has been synthesized and investiga... more In the present work, Nickel ferrite and graphene nanocomposite has been synthesized and investigated as flexible electrodes for supercapacitor application in an aqueous electrolyte with sodium sulfate (Na 2 SO 4). The structural properties of the asprepared nanocomposite electrode were analyzed by X-ray diffraction and Raman spectroscopy. Scanning electron microscopy was used to study the surface morphology and particles size in the nanocomposite. Elemental analysis of the electrode was performed using Energy dispersive spectroscopy. Supercapacitor performance of the nickel ferrite/graphene nanocomposite was evaluated using cyclic voltammetry. We have observed that specific capacitance depends significantly on the charging/ discharging voltage window of the device. A maximum specific capacitance of 22 mF/cm 2 (73 F/gm) was achieved between voltage range of − 0.5 to + 0.5 V. Nanocomposite electrodes showed the power density in the range of 200-900 W/kg.

Materials Advances, 2021

Carbon coated cobalt oxide (CC-Co3O4) was synthesized using sucrose and cobalt oxide. CC-Co3O4 ca... more Carbon coated cobalt oxide (CC-Co3O4) was synthesized using sucrose and cobalt oxide. CC-Co3O4 can be used as electrode material for supercapacitor applications

Materials Today: Proceedings, 2021

Zinc Oxide has important role in solar cell as it may enhance the absorption of light into the de... more Zinc Oxide has important role in solar cell as it may enhance the absorption of light into the device and improve the electrical transportation. In the present work, we have used drop casting approach to fabricate the nanocrystalline ZnO film on a glass substrate. Zinc acetate dehydrate and ethanol were used as a starting material and solvent, respectively. The zinc oxide solution was prepared by using a magnetic hot plate with a magnetic stirrer. X-Ray Diffraction (XRD) and UV-Visible were employed to characterize structure and optical properties of the as-deposited film. The XRD results confirm the nanocrystalline structure of the deposited ZnO films. From the UV-visible analysis it was observed that the optical transmittance form the ZnO film is around 80% in the wave length range from 400 nm À 1100 nm and it exhibited the energy band gap to be 3.10 eV.

Materials Advances, 2020

Sucrose-derived carbon-coated nickel oxide (SDCC-NiO) was successfully synthesized via a colloida... more Sucrose-derived carbon-coated nickel oxide (SDCC-NiO) was successfully synthesized via a colloidal method.

Surfaces and Interfaces, 2020

Herein, we report the silicon micro-particles for supercapacitor application. Electrochemical pro... more Herein, we report the silicon micro-particles for supercapacitor application. Electrochemical properties of silicon particles were studied in the present work. Firstly, the microstructure of the silicon particles was studied by Xray diffraction and Raman spectroscopy. Scanning electron microscopy was used to study the surface morphology of the sample. The electrochemical properties of the prepared electrode were investigated in 1 M Na 2 SO 4 electrolyte. Cyclic voltammetry, constant current changing/discharging and electrochemical impedance spectroscopy were chosen to evaluate electrochemical properties of the electrode. The as-fabricated electrode of silicon particles exhibited a specific capacitance of 0.58 mF/cm 2 at a scan rate of 10 mV/sec.

Nanoscale Advances, 2020

Supercapacitors have attracted significant attention in the last few years as they have the capab... more Supercapacitors have attracted significant attention in the last few years as they have the capability to fulfill the demand for both power and energy density in many energy storage applications.

ChemistrySelect, 2019

This study presents a fabrication and electrochemical properties of nickel ferrite/graphene nanoc... more This study presents a fabrication and electrochemical properties of nickel ferrite/graphene nanocomposite as electrodes material for supercapacitor application. The as-prepared electrode was characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and Xray photoelectron spectroscopy. The electrochemical properties were measured using cyclic voltammetry, galvanostatic charging/discharging methods and electrochemical impedance spectroscopy. Graphene nanosheets play an important role of governing the morphology of the electrode material and thereby enhancing the electrochemical performance of the composite electrode. The specific capacitance of 207 F/g is obtained for nickel ferrite/graphene nanocomposite, which is almost 4 times larger than pure nickel ferrite. The nanocomposite showed a stable capacitance of 95% after 1000 cycles in 1 M Na 2 SO 4 electrolyte. Electrochemical impedance spectroscopy results indicate that graphene nanosheets reduced the charge transfer resistance on the composite electrode. The obtained results show that the nanocomposite has a great potential to be used in supercapacitor with good electrochemical performance and longer cycle stability.

Journal of Alloys and Compounds, 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.

Ceramics International, 2019

The aim of the present work is to develop a novel electrode material for micro-supercapacitor (μ-... more The aim of the present work is to develop a novel electrode material for micro-supercapacitor (μ-SC) application, which must be compatible with the fabrication of Si microelectronic. A simple, cost-effective and scalable approach has been proposed to enhance the electrochemical capacitance of silicon nanowires (SiNWs). SiNWs grown using hot wire chemical vapor process (HWCVP) at low temperature were encapsulated with manganese dioxide (MnO 2) nanoparticles film. The prepared hybrid nanostructure of SiNW@MnO 2 core-shell showed stable electrochemical performance in an aqueous electrolyte of 1 M Na 2 SO 4. The MnO 2 shell was deposited on SiNWs by electrophoretic process (EPD) at room temperature. The synthesized SiNW@MnO 2 core-shell structure exhibited a specific capacitance of 2.1 mF/cm 2 , which is larger than to other Si-based materials reported in literature. The scalability and simplicity of the process make it useful to fabricate SiNW@MnO 2 electrodes based on-chip μ-SC with enhanced electrochemical performance.

Diamond and Related Materials, 2019

The fabrication of energy storage devices with lowering the cost and improving the performance ha... more The fabrication of energy storage devices with lowering the cost and improving the performance has always been the need for society. Therefore, supercapacitors with special features such as lightweight , easy portability and remarkable charging/discharging rate capability have widely been studied in the literature. In the present work, In-situ carbon coated manganese oxide nanorods (ISCC-MnO 2 NRs) have been studied for the supercapacitor application. ISCC-MnO 2 NRs were prepared by slip casting method followed by annealing at 1200°C. During heat treatment, sucrose has transformed into conducting carbon and coated on the surface of MnO 2. ISCC-MnO 2 NRs were examined by FEG-SEM, FEG-TEM, XRD, FT-IR, BET and Raman spectroscopy. The measurement of the electrochemical properties of the material was carried out in the two-electrode configuration using 1 M Na 2 SO 4 aqueous solution as an electrolyte. The specific capacitance of ISCC-MnO 2 NRs was found to be 28.24 F/g at the current density of 1 A g −1 with energy density of 0.98 Wh/kg. This work suggests ISCC-MnO 2 NRs may be a promising electrode material for the supercapacitor.

Functional Materials Letters, 2019

The graphene nanosheets have been deposited on silicon nanowires (SiNWs) at room temperature. SiN... more The graphene nanosheets have been deposited on silicon nanowires (SiNWs) at room temperature. SiNWs were grown by hot-wire chemical vapor process (HWCVP). A simple and room temperature approach known as electrophoretic deposition (EPD) process was adopted for the deposition of graphene sheets on SiNWs. GO sheets on SiNWs were converted to reduced graphene oxide (rGO) by photo-reduction method. EPD parameters were optimized to get a uniform coating of rGO on SiNWs. It was observed that the rGO deposition is greatly influenced by the deposition time and the applied voltage in the EPD process. rGO deposition was confirmed by FEG-SEM and FEG-TEM, and the reduction of GO to rGO was verified by Raman, UV–Vis and Fourier transform infrared (FTIR) spectroscopy.

Journal of Materials Science: Materials in Electronics, 2018

In the present work, bismuth iron oxide-graphene composite has been explored as electrode materia... more In the present work, bismuth iron oxide-graphene composite has been explored as electrode material for electrochemical supercapacitor application. Bismuth iron oxide (BFO) nanoparticles, synthesized by sol-gel process, are mixed with the graphene sheets in a solution. The electrodes are prepared by coating the resulted slurry on stainless steel (SS) substrate, by drop casting process. The morphology and structure of the BFO-graphene composite are characterized by XRD, FIB-SEM, HRTEM and Raman spectroscopy, which show that the nanoparticles with diameter 100-200 nm are randomly distributed on and around the graphene sheets. The composite electrode exhibits significantly enhanced capacitance as compared to BFO. In this structure, the electrons generated by the surface based Faradaic reactions from the BFO nanoparticles can be transported by the graphene nanosheets toward the current collector. The electrochemical characteristic of the electrodes is investigated through cyclic voltammetry and charging/discharging process. The specific capacitance of the electrode measured at 5-100 mV/s was found to be 17-4 mF/cm 2 which is comparable to the most commonly used metal oxide based electrode materials. It shows better cycling stability with 95% retention of capacitance after 2000 cycles.