Hydrothermal Synthesized of CoMoO(4) Microspheres as Excellent Electrode Material for Supercapacitor

The single-phase CoMoO(4) was prepared via a facile hydrothermal method coupled with calcination treatment at 400 °C. The structures, morphologies, and electrochemical properties of samples with different hydrothermal reaction times were investigated. The microsphere structure, which consisted of nanoflakes, was observed in samples. The specific capacitances at 1 A g(−1) are 151, 182, 243, 384, and 186 F g(−1) for samples with the hydrothermal times of 1, 4, 8, 12, and 24 h, respectively. In addition, the sample with the hydrothermal time of 12 h shows a good rate capability, and there is 45% retention of initial capacitance when the current density increases from 1 to 8 A g(−1). The high retain capacitances of samples show the fine long-cycle stability after 1000 charge-discharge cycles at current density of 8 A g(−1). The results indicate that CoMoO(4) samples could be a choice of excellent electrode materials for supercapacitor.