Nickel-Doped Co3O4@CoMoO4 Core-Shell Structures for Low Temperature Asymmetric Supercapacitors

It is significant to explore the electrode materials for supercapacitors with high storage energy and long cycling stability. Herein, nanoporous Ni-Co3O4@CoMoO4 composite is fabricated with excellent electrochemical performance. The as-prepared sample delivers a specific capacity of 1212 C g(-1) at 1 A g(-1) and superior cycle performance (91.7% after 10 000 times charging and discharging). Several asymmetric supercapacitors (ASCs) are assembled using the synthesized products as cathode. They achieve an energy density of 102 Wh kg(-1) at a power density of 2770 W kg(-1). In addition, the devices present outstanding mechanical stability after multiple bending, demonstrating their potential application in the field of portable energy storage devices.