Self-assembled three-dimensional hierarchical CoMoO4 nanosheets on NiCo2O4 for high-performance supercapacitor

Abstract Highly regular three-dimensional (3D) NiCo 2 O 4 /CoMoO 4 hierarchical nanosheets (NSs) were prepared through a simple hydrothermal process. During the hydrothermal process, ethylamine solution is crucial for the morphology of NiCo 2 O 4 /CoMoO 4 NSs and self-assembled formation of CoMoO 4 with porous architecture on NiCo 2 O 4 . Such curly porous hierarchical structure with large surface areas is benefit to provide numerous accessible electrochemically active sites for faradaic redox reactions. In addition, the morphologies and the mass loading adjustment of NiCo 2 O 4 /CoMoO 4 NSs can be easily achieved by controlling growth time. The as-prepared NiCo 2 O 4 /CoMoO 4 electrode demonstrates superior specific capacitance (1730 F/g at 1 A/g), satisfied rate capability (60%, at 20 A/g), and excellent cycling stability (76.2% capacitance retention at 10 A/g). These good electrochemical performances exhibit that the as-obtained NiCo 2 O 4 /CoMoO 4 composites are efficient electrode materials for pseudo-capacitors and may provide a useful guidance for obtaining electrode materials with outstanding electrochemical performance.