Nitrogen-Doped Porous Carbon Derived from Carbazole-Substituted Tetraphenylethylene-Based Hypercrosslinked Polymer for High-Performance Supercapacitor (original) (raw)
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Nitrogen and oxygen co-doped porous carbon for high performance supercapacitors
Journal of Materials Science: Materials in Electronics, 2017
Nitrogen and oxygen co-doped porous carbons have been synthesized facilely from peanut bran via pre-carbonization coupled with KOH activation. The porous carbon prepared having high N, O contents of 2.12 and 14.69 at.%, respectively, possesses highly porous structure with the specific surface area of 2050 m 2 /g, total pore volume of 1.126 cm 3 /g, and suitable mesoporosity of 36.2%. When used as electrode materials for two-electrode symmetric supercapacitors, it delivers a specific capacitance of 237 F/g at the current density of 0.047 A/g, consisting of electric double layer capacitance and pseudocapacitance originated from the doping heteroatoms, displays a good rate capability of 86.5% in the current range of 0.047-2.37 A/g, exhibits superior cycling stability with 98% capacitance retention after 1000 charge-discharge cycles at 2.37 A/g, and demonstrates low equivalent series resistance of 0.1 Ω. The outstanding electrochemical performance is due to the synergistic effect of large specific surface area with unique pore structure and doping heteroatoms of nitrogen and oxygen.
ChemElectroChem, 2019
A facile and template-free synthetic approach was utilized to obtain a series of nitrogen and oxygen-doped microporous carbon spheres (CTS-X-700) from carbazole-terephthalaldehyde based copolymer spheres (CTS). The inherent spherical morphology of the co-polymer remained intact even after activation at high temperature (700°C). The synthesized materials exhibit BET surface area of up to 1340 m 2 g À 1 with an interconnected porous network consisting of ultramicropores and supermicropores along with a small amount of mesopores. Moreover, a good balance of heteroatom surface functionalities (N content up to 3.2 % and O content up to 12 %) was maintained without compromising the porosity by systematically varying the activation conditions. These features result in a high specific capacitance value of 407 F g À 1 at 1.0 A g À 1 in aqueous acid electrolyte with a three-electrode system and superior cycle stability of 100 % capacitance retention even after 10000 cycles. Furthermore, the high energy density (10.6 W h kg À 1 at a current density of 0.5 A g À 1) in an aqueous electrolyte of the assembled supercapacitor device further demonstrates the possible applications of the synthesized materials as high-performance energy storage devices.
A scalable production of high surface area nanoporous carbon material ($2994 m 2 g À1 ) with good distribution of micro-, meso-and macro-pores was hydrothermally synthesized using both cheap polymers and graphene foam as carbon sources. The as synthesised material shows a unique interconnected porous graphitic structure. The electrochemical double-layer capacitor fabricated from this nanoporous carbon material exhibited a superior supercapacitive performance of 188 F g À1 at current density 0.5 A g À1 . This corresponded to areal capacitance of 6.3 mF cm À2 coupled with a high energy of 0.56 mWh cm À2 (16.71 Wh kg À1 ) and a power density of 13.39 mW cm À2 (401 W kg À1 ) due to extended potential window of 1.6 V in KOH aqueous electrolyte. Moreover, no capacitance loss after 10,000 cycles was observed, owing to the unique structure and large surface area of the active material. The outstanding performance of this material as supercapacitor electrode shows that it has great potential for high performance energy-related applications.
Facile synthesis of nitrogen-doped porous carbon for supercapacitors
Journal of Materials Chemistry A, 2013
Solid-state post-combustion CO 2 sorbents have certain advantages over traditional aqueous amine systems, including reduced regeneration energy since vaporization of liquid water is avoided, tunable pore morphology, and greater chemical variability. We report here an ordered mesoporous nitrogen-doped carbon made by the coassembly of a modified-pyrrole and triblock copolymer through a soft-templating method, which is facile, economic, and fast compared to the hard-template approach. A high surface area mesoporous carbon was achieved, which is comparable to the silica counterpart. This porous carbon, with a Brunauer-Emmett-Teller (BET) specific surface area of 804.5 m 2 g -1 , exhibits large CO 2 capacities (298 K) of 1.0 and 3.1 mmol g -1 at 0.1 and 1 bar, respectively, and excellent CO 2 /N 2 selectivity of 51.4. The porous carbon can be fully regenerated solely by inert gas purging without heating. It is stable for multiple adsorption/desorption cycles without reduction in CO 2 capacity. These desirable properties render the nitrogen-doped hierarchical porous carbon a promising material for post-combustion CO 2 capture.
Highly active N, O-doped hierarchical porous carbons for high-energy supercapacitors
Chinese Chemical Letters, 2020
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.
Carbon, 2019
Low-cost multi-heteroatom doped porous carbons derived from agricultural waste were prepared as the base material. Then, the cobalt oxides nanosheets were anchored to the surface of the carbon material to obtain the composites. It was found that the adoption of porous carbon is of great significance for the improvement of materials properties. The presence of porous structure derived from carbon materials not only increases the stability of the material, but also facilitates the diffusion and transfer of electrolyte ions. Meanwhile, the flaky Co 3 O 4 endows the material with high energy density and high charge transport efficiency. The resulted composite materials exhibit high specific surface area with low electrochemical impedance. Both aqueous and solid-state SCs were assembled separately. The energy density of aqueous SC can reach up to 42.5 Wh kg À1 at a power density of 746 W kg À1 and even with power density up to 30 kW kg À1 as the energy density still maintained 25 Wh kg À1. As for solid-state SC, the energy density can reach 40.6 mWh cm À2. The retention of solid-state SC can maintain at 87.1% even after 3000 cycle numbers. The excellent performance of composites enables them to be promising electrode materials for energy storage.
Journal of Science: Advanced Materials and Devices, 2019
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.
2021
Background and purpose: For application in supercapacitors, improving the efficiency of the electrode materials is the most important for obtaining high performance. Porous carbon with suitable architectures is reliable for improved electrochemical capacitors. In this study, we optimized the maize cobs as a potential abundant precursor for the production of porous carbon supercapacitor applications. This research study aimed to advance on the activation method for Activation of the biomass and to up-cycling agricultural biomass into carbon-based porous materials for supercapacitor electrode application. The carbonized samples were kept in a desiccator for 3 hours to allow intercalation and interaction of the carbon lattice expansion by K+ ion before Activation [Topic, RQ]. Results: The physical and chemical characterization of the synthesized materials was carried out several techniques for determining different properties of the activated carbon from maize cobs, including; structur...