The influence of crystal structures on the performance of CoMoO4 battery-type supercapacitor electrodes

Abstract

CoMoO₄ is a promising battery-type supercapacitor electrode material that can offer relatively high storage capacity and cycle stability. In this work, we investigate the role of the crystalline phase of CoMoO₄ in determining these performance parameters. The hydrate phase of CoMoO₄ was synthesized on a nickel foam substrate via hydrothermal reaction with subsequent annealing under an inert atmosphere leading to the formation of the β-phase CoMoO₄. Similar nanoplate morphologies were observed in all of the samples. The hydrate-phase CoMoO₄ demonstrates larger specific capacity than the annealed β-phase CoMoO₄. Besides, the samples synthesized at lower temperatures have better rate capability than the sample annealed at higher temperatures. However, the hydrate phase had worse long-term stability compared to the β-phase samples.