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.