Accessible Requires Authentication Published by De Gruyter August 30, 2018

Co3O4/carbon nano-onions composite as supercapacitor electrode and its excellent electrochemical performance

Chen Wang, Fuliang Zhu, Gongrui Wang, Mingjun Xiao, Yanshuang Meng and Yue Zhang

Abstract

An ionic liquid derived Co3O4/carbon nano-onions composite has been prepared by carbothermal reduction followed by oxidation. The introduction of carbon nano-onions improves the conductivity and structural stability of Co3O4 electrode material. Electrochemical measurements indicate that the redox reversibility is significantly improved. The Co3O4/carbon nano-onions composite shows a large specific capacitance of 402.35 F g–1 at a current density of 0.5 A g–1. After 9000 cycles, the specific capacitance retention remained 76% at 1 A g–1. The as-prepared Co3O4/carbon nano-onions composite delivers superior capacitive performance with good rate capability, large specific capacitance, and excellent cyclic performance, showing great application potential for high-performance electrochemical supercapacitors.


*Correspondence address, Associate Prof. Dr. Yanshuang Meng, School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, P. R. China, Tel.: +86(931)2976378, Fax: +86(931)2976702, E-mail:
** Prof. Dr. Yue Zhang, Department of Mechanical and Industrial Engineering, Texas A&M University-Kingsville, Kingsville, TX 78363, U.S.A, Tel.: +1(361)593-3342, Fax: +1(361)593-4026, E-mail:

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Received: 2018-02-28
Accepted: 2018-04-09
Published Online: 2018-08-30
Published in Print: 2018-09-14

© 2018, Carl Hanser Verlag, München