CoMoO4@Ni(OH)2 electrode materials for high-performance flexible hybrid capacitors

Abstract

It is very important to rationally design electrode materials with remarkable electrical conductivity and high specific surface area for supercapacitors. However, it is limited by insufficient energy density, so the development of high-performance electrodes has become research focuses. Herein, we report the synthesis of CoMoO4@Ni(OH)2 composite structures by hydrothermal growth of Ni(OH)2 nanosheets on CoMoO4 materials. The synthesized product achieves 93% of capacitance retention after 10,000 times cycling and possesses a specific capacitance of 2640 F g-1 at 1 A g-1. Furthermore, the assembled device delivers an energy density of 74.25 Wh kg-1 when the power density is 2700 W kg-1. Besides, the materials still present outstanding flexibility and mechanical stability after bending at different angles and times.