High-Performance MoO₃ Nanoplate Electrode for Asymmetric Supercapacitor with Long-Term Electrochemical Stability.

In the present study, by controlling the content of ammonium molybdate via a facile hydrothermal method, we achieved MoO3 electrodes with different morphologies, i.e., triangular nanoplates, triangular prisms and four prisms. As the electrode material of supercapacitors, the MoO3 electrodes with triangular nanoplates show the highest specific capacitance (104 mAh g(-1) at 2 mA cm(-2)) as well as a good cycling performance with 92.4% retention rate after 8000 cycles at 10 mA cm(-2). Subsequently, an asymmetric supercapacitor is fabricated using the MoO3-0.15 and activated carbon (AC) as cathode and anode, respectively. The fabricated supercapacitor shows a high energy density of 24.8 Wh kg(-1) at a power density of 358 W kg(-1). Significantly, the device manifests a long-term cycling stability with retention rate of 103% even after 16000 cycles. According to the noted facts, the promising prospects of MoO3 electrode for practical applications in supercapacitor are definitely confirmed.