Formation of nickel cobalt sulfide ball-in-ball hollow spheres with enhanced electrochemical pseudocapacitive properties

Laifa Shen, Le Yu, Hao Bin Wu, Xin-Yao Yu, Xiaogang Zhang and Xiong Wen (David) Lou ()
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Laifa Shen: School of Chemical and Biomedical Engineering, Nanyang Technological University
Le Yu: School of Chemical and Biomedical Engineering, Nanyang Technological University
Hao Bin Wu: School of Chemical and Biomedical Engineering, Nanyang Technological University
Xin-Yao Yu: School of Chemical and Biomedical Engineering, Nanyang Technological University
Xiaogang Zhang: College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics
Xiong Wen (David) Lou: School of Chemical and Biomedical Engineering, Nanyang Technological University

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract While the synthesis of hollow structures of transition metal oxides is well established, it is extremely challenging to fabricate complex hollow structures for mixed transition metal sulfides. Here we report an anion exchange method to synthesize a complex ternary metal sulfides hollow structure, namely nickel cobalt sulfide ball-in-ball hollow spheres. Uniform nickel cobalt glycerate solid spheres are first synthesized as the precursor and subsequently chemically transformed into nickel cobalt sulfide ball-in-ball hollow spheres. When used as electrode materials for electrochemical capacitors, these nickel cobalt sulfide hollow spheres deliver a specific capacitance of 1,036 F g−1 at a current density of 1.0 A g−1. An asymmetric supercapacitor based on these ball-in-ball structures shows long-term cycling performance with a high energy density of 42.3 Wh kg−1 at a power density of 476 W kg−1, suggesting their potential application in high-performance electrochemical capacitors.

Date: 2015
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DOI: 10.1038/ncomms7694

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