Electrodeposited Nanoflakes of RuOx·nH2O on Three-dimensional Graphene for Flexible Supercapacitors

Abstract

Flexible electricity storage devices with high areal capacitance were urgently demanded due to recent development of advanced portable electronics. In this work, a facile cathodic electrodeposition method was employed to anchor RuO x •nH 2 O on three-dimensional graphene frameworks to realize improved utilization efficiency of RuO x •nH 2 O and shortened diffusion/transport path for electrons and protons, without adhesives. A high areal capacitance of 3.78 F•cm 2 was achieved at 2 mV•s 1 , which was attributed to the feasible electrolyte transport into the nano layered-structure of RuO x •nH 2 O. Furthermore, all-solid-state flexible supercapacitors were prepared for practical application, achieving an energy density of 0.1 mWh•cm 2 and a power density of 2.4 mW•cm 2 at a current density of 10 mA•cm 2 , which surpassed most state-of-the-art works.

Optimization of the electrodeposition process of a polypyrrole/multi-walled carbon nanotube fiber electrode for a flexible supercapacitor

“…Flexible ber supercapacitors have received extensive attention in the eld of exible electronic fabrics. [1][2][3][4][5][6] The elemental compositions of exible ber and ordinary supercapacitors are the same: a collector, electrode, electrolyte, and encapsulation material; simultaneously, owing to their ber characteristics, they are different in terms of materials and assembly methods. The function of the ber surface of a supercapacitor, the compositions of which are twisted pair, coaxial, and double electrode parallel type, plays the role of a exible substrate and uid collector.…”