One-pot construction of three dimensional CoMoO4/Co3O4 hybrid nanostructures and their application in supercapacitors

Abstract

A facile one-pot hydrothermal method was developed to synthesize a CoMoO₄/Co₃O₄ hybrid nanostructure where CoMoO₄ nanosheets were supported by a hierarchical framework assembled by Co₃O₄ nanorods. The morphology and structure of this three dimensional nanocomposite were characterized in detail and a rational growth mechanism was proposed based on them. The unique structural features of our CoMoO₄/Co₃O₄ hierarchical nanohybrid allow for high specific surface and multiple faradaic redox reactions for electrode materials of supercapacitors. Consequently, a high specific capacitance (1062.5 F g⁻¹ at the current density of 1 A g⁻¹) and an excellent cyclic performance (90.38% of the initial capacitance retained after 2000 cycles at a current density of 20 A g⁻¹) were obtained. In addition, an asymmetric supercapacitor with high energy density of 31.64 W h kg⁻¹ was achieved at a power density of 7270 W kg⁻¹. This work thus provides an excellent candidate for high-performance supercapacitor fabrication.