N-doped 3D porous carbon-graphene/polyaniline hybrid and N-doped porous carbon coated gC3N4 nanosheets for excellent energy density asymmetric supercapacitors

Mangisetti, Sandhya Rani; Kamaraj, M.; Ramaprabhu, Sundara

doi:10.1016/j.electacta.2019.03.043

Cited by 46 publications

(24 citation statements)

References 45 publications

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“…[147] For example, hierarchical N-doped porous carbon covered g-C 3 N 4 nanosheets exhibit a gravimetric capacitance of 740 F g −1 at 2 A g −1 in 1 m H 2 SO 4 (3E). [148] Unfortunately, pristine g-C 3 N 4 has several flaws like low surface area, poor conductivity, restacking, etc., that limit the power density and energy density of the system. [147]…”

Section: Graphitic Carbon Nitridementioning

confidence: 99%

Heteroatom‐Doped and Oxygen‐Functionalized Nanocarbons for High‐Performance Supercapacitors

Ghosh

Barg

Jeong

et al. 2020

Advanced Energy Materials

434

237

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Electrochemical capacitors (best known as supercapacitors) are high‐performance energy storage devices featuring higher capacity than conventional capacitors and higher power densities than batteries, and are among the key enabling technologies of the clean energy future. This review focuses on performance enhancement of carbon‐based supercapacitors by doping other elements (heteroatoms) into the nanostructured carbon electrodes. The nanocarbon materials currently exist in all dimensionalities (from 0D quantum dots to 3D bulk materials) and show good stability and other properties in diverse electrode architectures. However, relatively low energy density and high manufacturing cost impede widespread commercial applications of nanocarbon‐based supercapacitors. Heteroatom doping into the carbon matrix is one of the most promising and versatile ways to enhance the device performance, yet the mechanisms of the doping effects still remain poorly understood. Here the effects of heteroatom doping by boron, nitrogen, sulfur, phosphorus, fluorine, chlorine, silicon, and functionalizing with oxygen on the elemental composition, structure, property, and performance relationships of nanocarbon electrodes are critically examined. The limitations of doping approaches are further discussed and guidelines for reporting the performance of heteroatom doped nanocarbon electrode‐based electrochemical capacitors are proposed. The current challenges and promising future directions for clean energy applications are discussed as well.

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Section: Graphitic Carbon Nitridementioning

confidence: 99%

Heteroatom‐Doped and Oxygen‐Functionalized Nanocarbons for High‐Performance Supercapacitors

Ghosh

Barg

Jeong

et al. 2020

Advanced Energy Materials

434

237

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“…Conductive polymers such as polyaniline (PANI), polypyrrole (PPy), own the advantages of high conductivity, fast redox activity, low cost, and high capacitance, have been widely used as electrodes for SCs. [ 77–87 ] However, pure PANI or PANI possess the disadvantages of poor cycling stability owing to the shrinkage of polymeric chains. The most effective way to overcome the drawbacks is to incorporate conductive polymers into carbon materials.…”

Section: Classifications Of Ascs With Carbon Materials As Electrodementioning

confidence: 99%

Recent Advances of Asymmetric Supercapacitors

Bai

Pan

et al. 2020

Adv Materials Inter

195

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Asymmetric supercapacitors (ASCs) have attracted significant attentions worldwide owing to their wider voltage window compared with symmetric supercapacitors (SCs). Through combinations of two electrodes with different charge storage mechanisms or different redox reactions, extended operating voltage window can be realized for ASCs. In this article, first the ASCs are classified into two types based on different charge storage mechanisms: electric double‐layer capacitive (EDLC)//pseudocapacitive‐type ASCs and EDLC//battery‐type hybrid SCs. For the EDLC/pseudocapacitive‐type ASC, carbon materials are adopted as anode and transition metal oxides including MnO2, RuO2, etc., are utilized as cathodes. For EDLC//battery‐type hybrid SCs, carbon materials as anode are combined with metal oxide/hydroxide such as NiO, and Ni(OH)2, etc., as cathode. Recently, Li‐ion‐based ASCs composed of carbon materials and Li‐ion battery‐type electrode materials with a Li‐containing organic electrolyte show great potentials to be promising alternatives. Some metal oxides/nitrides including InO2, Bi2O3, Fe3O4, Fe2O3, and VN can work in a negative potential range. By coupling another battery/pseudocapacitive electrode, all redox‐type ASCs are assembled and their electrochemical performances are widely studied. Then, based on the above categories recent advances of ASCs are summarized. Finally, the challenges and prospects for the development of ASCs are pointed out from perspectives of this study.

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“…[26,27] By producing composites of conducting polymers and nanostructured carbon materials, the shortcomings of the conducting polymer can be overcome by the improvement in electrical conductivity and cycling life of PANI. [20,[28][29][30] Therefore, composite materials show dramatic improvements in performance compared to pristine PANI or CNTs. However, to increase the rate performance of the CNT/PANI composite, and therefore the power delivery, it is necessary to reduce the junction resistance between PANI and the carbon to facilitate rapid charge transfer.…”

Section: Introductionmentioning

confidence: 99%

Exceptional rate capability from carbon‐encapsulated polyaniline supercapacitor electrodes

Stott¹,

Tas²,

Matsubara

et al. 2020

Energy & Environ Materials

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A high‐rate capability carbon‐encapsulated polyaniline (PANI) composite is fabricated by a novel electrodeposition method of polyaniline on a carbon nanotube (CNT) forest, grown on carbon paper. This is followed by coating of an amorphous carbon layer via hydrothermal carbonization (HTC) of glucose, forming a three‐layer structure. We demonstrate that a slow scan rate, voltage‐restricted electrodeposition process can be used to produce a uniform PANI coating on individual CNTs throughout the network. The CNT forest structure offers excellent electronic and structural connection for the PANI nanofiber network, while the coating of amorphous carbon reduces electrode resistance, promoting enhanced electrochemical performance and reinforced structural stability during charging and discharging. The as‐prepared CNT/PANI/HTC composite exhibited a high specific capacitance of 571 F g−1 at 1 A g−1, and 557 F g−1 at 100 A g−1,whilst demonstrating a record rate capability of 98% capacitance retention, when the current density is increased 100‐fold. This advanced rate performance indicates that a slow electrodeposition process produces an electrochemically stable three‐layer composite with enhanced diffusion kinetics. Hence, the method developed in this work establishes further control on the electrochemical deposition of energy storage materials, for high‐rate capability.

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N-doped 3D porous carbon-graphene/polyaniline hybrid and N-doped porous carbon coated gC3N4 nanosheets for excellent energy density asymmetric supercapacitors

Cited by 46 publications

References 45 publications

Heteroatom‐Doped and Oxygen‐Functionalized Nanocarbons for High‐Performance Supercapacitors

Heteroatom‐Doped and Oxygen‐Functionalized Nanocarbons for High‐Performance Supercapacitors

Recent Advances of Asymmetric Supercapacitors

Exceptional rate capability from carbon‐encapsulated polyaniline supercapacitor electrodes

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