Carbon cloth supported graphitic carbon nitride nanosheets as advanced binder-free electrodes for supercapacitors

In this work, the binder-free CC@g-C3N4-900 electrode is prepared through coating graphite carbon nitride (g-C3N4) nanosheets onto the flexible substrate of carbon cloth (CC) by a facile strategy. The CC@g-C3N4-900 electrode delivers a remarkable specific capacitance (499 F g(-1) at 1 A g(-1)), an excellent rate capability (292 F g(-1) at 20 A g(-1)) and outstanding cyclic performance (capacitance loss of only 4.4% after 10,000 cycles). The symmetric supercapacitor device based on CC@g-C3N4-900 exhibits decent energy density at ultrahigh power density (10.1 Wh kg(-1) at 10000W kg(-1)), and superb cyclic performance (without capacitance reduction after 10,000 cycles). The superior electrochemical performance of the CC@g-C3N4-900 electrode can be ascribed to its self-supported binder-free character, high nitrogen doping and strong coupling between CC and g-C3N4 nanosheets, which results in a small charge transfer resistance, highly stable electrode structure and remarkable pseudocapacitance. (C) 2020 Elsevier B.V. All rights reserved.