Dual-Oxide Nanostructures Electrodes for High Energy Density Asymmetric Supercapacitors

Abstract

Electricity storage is necessary to address the intermittency problem from renewable energy resources such as wind and solar energy. Supercapacitors are energy storage devices which are complimentary batteries in terms of power density are attractive for many applications. Developing high energy density supercapacitor with high power density remains a challenge. Here, we present a strategy to fabricate the high energy density dual-oxide and reduced graphene oxide composites of dual-oxide asymmetric pseudocapacitors operating in an environment friendly aqueous neutral electrolyte. The 1D and 2D rGO/V2O5 nanostructures display superior electrochemical performance compared to the V2O5 nanostructure electrodes in aqueous electrolytes. Nanostructured MoO3 was used as an anode to fabricate the dual-oxide asymmetric supercapacitor. The asymmetric supercapacitor devices show a working voltage window of 1.6 V. The energy and power density values are, to our knowledge, higher than any that have been previously reported for asymmetric supercapacitors using V2O5 electrodes. Reference: D. H. Nagaraju, Qingxiao Wang, P. Beaujuge and H. N. Alshareef J. Mater. Chem. A , 2014, 2, 17146-17152.