CuCo2O4 nanoneedle array with high stability for high performance asymmetric supercapacitors

Ling Zhang; Ruizhi Li; Weiqun Li; Rongcong Li; Chenliang Li; Yingke Zhou

doi:10.1039/d0ra03771k

CuCo₂O₄ nanoneedle array with high stability for high performance asymmetric supercapacitors

RSC Adv. 2020 Jun 15;10(38):22775-22782. doi: 10.1039/d0ra03771k. eCollection 2020 Jun 10.

Authors

Ling Zhang¹, Ruizhi Li^{1

2}, Weiqun Li¹, Rongcong Li¹, Chenliang Li¹, Yingke Zhou¹

Affiliations

¹ The State Key Laboratory of Refractories and Metallurgy, Institute of Advanced Materials and Nanotechnology, College of Materials and Metallurgy, Wuhan University of Science and Technology Wuhan 430081 P. R. China rzli@wust.edu.cn zhouyk@wust.edu.cn.
² Chongqing Key Laboratory for Advanced Materials & Technologies of Clean Energies Chongqing 400715 P. R. China.

Abstract

Cycling performance is very important to device application. Herein, a facile and controllable approach is proposed to synthesize high stability CuCo₂O₄ nanoneedle array on a conductive substrate. The electrode presents excellent performances in a large specific capacitance up to 2.62 F cm^-2 (1747 F g^-1) at 1 mV s^-1 and remarkable electrochemical stability, retaining 164% even over 70 000 cycles. In addition, the asymmetric supercapacitor assembled with the optimized CuCo₂O₄ nanoneedle array (cathode) and active carbon (anode), which exhibits superior specific capacity (146 F g^-1), energy density (57 W h kg^-1), and cycling stability (retention of 83.9% after 10 000 cycles). These outstanding performances are mainly ascribed to the ordered binder-free nanoneedle array architecture and holds great potential for the new-generation energy storage devices.