Journal ArticleDOI
High-performance and thermostable wire supercapacitors using mesoporous activated graphene deposited on continuous multilayer graphene
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TLDR
In this article, activated graphene (AG) was coated onto continuous graphene deposited on Cu wire current collectors using electrophoretic deposition, forming wire supercapacitors with high power and energy density.Abstract:
Wire supercapacitors are promising flexible power sources for wearable devices because of their high power density, long cycle life, and mechanical flexibility However, obtaining high energy density along with thermal stability is essential for developing sustainable wire supercapacitors that use a charge storage mechanism based on electric double-layer (EDL) formation In this study, activated graphene (AG) was coated onto continuous graphene deposited on Cu wire current collectors using electrophoretic deposition, forming wire supercapacitors with high power and energy density as well as outstanding thermal stability and chemical resistance The incorporation of AG, which has a high specific surface area, enabled nearly ideal capacitive behaviors of the devices with high specific areal capacitances of up to 1303 mF cm−2 Multilayer graphene grown by chemical vapor deposition (CVD) on Cu wires worked as a multifunctional intermediate layer for enhancing the interfacial contact between the electrode and the current collector as well as the electrical conductivity, chemical resistance, and thermal stability of the Cu wire The great synergy between the AG electrode material and CVD-grown graphene on Cu current collectors achieved high energy densities of up to 454 μW h cm−2 and outstanding power densities of up to 161 mW cm−2 with excellent cycling stability (∼938% capacitance retention over 10 000 cycles) Furthermore, the wire supercapacitors exhibited stable EDL charge storage capability for temperatures ranging from 7 to 80 °C This unique architecture of wire supercapacitors promises great potential for high-performance and thermostable energy storage, and can be embedded in future wearable electronics and smart textilesread more
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High performance supercapacitors based on wood-derived thick carbon electrodes synthesized <i>via</i> green activation process
TL;DR: In this paper , a green, versatile, and universal H 2 O 2 activation method is proposed to improve the capacitive properties of high-mass loading wood-based supercapacitors.
Journal ArticleDOI
Voltage holding and self-discharge phenomenon in ZnO-Co3O4 core-shell heterostructure for binder-free symmetric supercapacitors
Rajneesh Kumar Mishra,Gyu Jin Choi,Hyeon Jong Choi,Jay Singh,Fateme Sadat Mirsafi,Horst-Günter Rubahn,Yogendra Kumar Mishra,Seung Hee Lee,Jin Seog Gwag +8 more
TL;DR: In this paper, an eco-friendly, in-situ, and one-step synthesis of ZnO-Co3O4 core-shell heterostructure (ZC-CSH) using the hydrothermal process as a transcendent nanomaterial for the supercapacitor applications was reported.
Journal ArticleDOI
Voltage holding and self-discharge phenomenon in ZnO-Co3O4 core-shell heterostructure for binder-free symmetric supercapacitors
TL;DR: In this article , an eco-friendly, in-situ, and one-step synthesis of ZnO-Co 3 O 4 core-shell heterostructure (ZC-CSH) using the hydrothermal process as a transcendent nanomaterial for the supercapacitor applications was reported.
Journal ArticleDOI
Thermal effect on the pseudocapacitive behavior of high-performance flexible supercapacitors based on polypyrrole-decorated carbon cloth electrodes
TL;DR: In this article, a PPy-based flexible symmetric supercapacitor was constructed on the surface of carbon cloth as electrodes and a PVA-H3PO4 gel electrolyte.
Journal ArticleDOI
Measurements of the electrical conductivity of monolayer graphene flakes using conductive atomic force microscopy
TL;DR: In this article, an isolated graphene flake connected to a pre-fabricated electrode was scanned using an electrically biased tip, which generated a current map over the flake area.
References
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Journal ArticleDOI
Large-Area Synthesis of High-Quality and Uniform Graphene Films on Copper Foils
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Journal ArticleDOI
Graphene-Based Ultracapacitors
TL;DR: CMG materials are made from 1-atom thick sheets of carbon, functionalized as needed, and here their performance in an ultracapacitor cell is demonstrated, illustrating the exciting potential for high performance, electrical energy storage devices based on this new class of carbon material.
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