Hybrid Co(OH)(2)ano-graphene/ Ni nano-composites on silicon microchannel plates for miniature supercapacitors

摘要

Nano-scale Co(OH)(2)/NG (nano-graphene: NG) composites serving as the active materials of miniature supercapacitors are deposited on macroporous electrically conductive network (MECN). The Co(OH)(2)/NG composite in the channels largely contribute to the capacitance. The electrochemical properties are investigated by cyclic voltammetry (CV), galvanostatic charging-discharging, and electrochemical impedance spectroscopy (EIS) in a 2 M KOH solution. The Co(OH)(2)/NG composite exhibits a stable capacitance of 3.522 F/cm(2) (880.5 F/g) and retention ratio is 99% after 5000 cycles demonstrating the stability and durability. The Co(OH)(2)/NG/MECN can be scanned faster than Co(OH)(2)/MECN in CV because of the higher conductivity. (C) 2016 Elsevier B.V. All rights reserved.