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

Abstract

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.