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

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 RuOx center dot nH(2)O on three-dimensional graphene frameworks to realize improved utilization efficiency of RuOx center dot 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 RuOx center dot 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.