Hierarchical Co3O4@Co9S8 nanowall structures assembled by many nanosheets for high performance asymmetric supercapacitors

Lei Xing; Yidi Dong; Xiang Wu

doi:10.1039/c8ra05722b

Hierarchical Co₃O₄@Co₉S₈ nanowall structures assembled by many nanosheets for high performance asymmetric supercapacitors

RSC Adv. 2018 Aug 6;8(49):28172-28178. doi: 10.1039/c8ra05722b. eCollection 2018 Aug 2.

Authors

Lei Xing¹, Yidi Dong¹, Xiang Wu¹

Affiliation

¹ School of Materials Science and Engineering, Shenyang University of Technology Shenyang 110870 China wuxiang05@163.com.

Abstract

Herein, we report hierarchical Co₃O₄@Co₉S₈ nanowalls assembled by many nanosheets. The as-synthesized products are characterized in detail using various characterization methods. They can be directly used as supercapacitor electrodes with excellent electrochemical performance due to the synergy effect between Co₃O₄ and Co₉S₈. Furthermore, a flexible asymmetric supercapacitor is fabricated by using the as-synthesized Co₃O₄@Co₉S₈ structures as the cathode and the active carbon as the anode, which reveals a specific capacitance of 266.6 mF cm^-2 at a current density of 4 mA cm^-2. In addition, the supercapacitor shows an excellent capacity retention rate of 86.5% after 10 000 cycles at a current density of 10 mA cm^-2. Finally, three supercapacitor devices connected in series can light a blue LED lamp for 5 min.