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

CoMoO 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 CoMoO in determining these performance parameters. The hydrate phase of CoMoO was synthesized on a nickel foam substrate hydrothermal reaction with subsequent annealing under an inert atmosphere leading to the formation of the β-phase CoMoO. Similar nanoplate morphologies were observed in all of the samples. The hydrate-phase CoMoO demonstrates larger specific capacity than the annealed β-phase CoMoO. 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.