One step simultaneous electrochemical synthesis of NiO/multilayer graphene nanocomposite as an electrode material for high performance supercapacitors

A NiO/graphene nanocomposite has been prepared via one step electrochemical synthesis using simultaneous pulse alternating current dispersion of both Ni electrode and an electrode of thermally expanded graphite. Electron microscopy and Raman spectroscopy data reveals that the composite consists of graphene sheets with 2-5 layers having 0.5-2 mm size as well as NiO sheets with 200-250 nm dimensions comprising NiO nanoparticles of similar to 3.6 nm diameter. The electrochemical capacitance of the nanocomposite is 825 F g(-1), with retaining 89% of the initial value after 1000 operation cycles.

Automated summary

In this study, a NiO/graphene nanocomposite was synthesized via a one-step electrochemical method, showing promising electrochemical performance with a capacitance of 825 F g(-1), and retaining 89% of the initial value after 1000 operation cycles. The composite is composed of graphene sheets with 2-5 layers and NiO sheets with NiO nanoparticles of 3.6 nm diameter.