Approaching high performance Ni(Co) molybdate electrode materials for flexible hybrid devices

Abstract

Transition metal molybdates are widely used as electrode materials for supercapacitors due to their high theoretical specific capacitance and excellent electrochemical activity. It is an effective strategy to improve the electrochemical performance by reasonably designing electrode materials. Herein, we prepared several Ni_1-xCo_xMoO₄·nH₂O nanostructures through facile hydrothermal strategies. Benefiting from the synergistic effects between Ni and Co elements, the obtained electrode materials delivered a specific capacitance of 1390 F g⁻¹ at 1 A g⁻¹. The as-assembled device shows an energy density of 72.45 W h kg⁻¹ at a power density of 2688.8 W kg⁻¹. It also presents excellent cycling and mechanical stability after many times of charging and discharging processes and bending.