期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 43, 页码 22782-22789出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta07160d
关键词
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资金
- National Natural Science Foundation of China [61674071, 21477050, 21522603, 51602131]
- Chinese German Cooperation Research Project [GZ1091]
- Excellent Youth Foundation of Jiangsu Scientific Committee [BK20140011, BK20160526]
- Program for New Century Excellent Talents in University [NCET-13-0835]
- Henry Fok Education Foundation [141068]
- Six Talents Peak Project in Jiangsu Province [XCL-025]
- Jiangsu Province Postdoctoral Science Foundation [1601059C]
- China Postdoctoral Science Foundation [2016M600368]
In this work, novel hierarchical cobalt sulfide@ nickel hydroxide [Co9S8@Ni(OH)(2)] core-shell nanotube arrays supported on carbon fibers have been designed logically and synthesized for use as supercapacitors. The one-dimensional Co9S8 nanotubes (NTs) serve as an ideal backbone to improve the electrical conductivity of Ni(OH)(2) nanosheets, whereas the ultrathin and redox active Ni(OH)(2) nanosheets electrodeposited on the Co9S8 NTs greatly enhance the surface area and provide more electroactive sites for faradaic reaction. The optimized Co9S8@Ni(OH)(2) electrode shows high specific capacitances of 149.44 mA h g(-1) at the current density of 1 A g(-1) and 75 mA h g(-1) even at 10 A g(-1). An asymmetric supercapacitor was successfully assembled with this unique hybrid nanostructure as the anode and an active carbon film as the cathode. The as-fabricated device shows high energy density (31.35 W h kg(-1) at 252.8 W kg(-1)), high power density (2500 W kg(-1) at 12.5 W h kg(-1)), as well as a long-term cycle stability (97.3% retention of its initial capacitance after 5000 cycles). The as-prepared hierarchical nanostructure shows great potential as a promising electrode material for energy storage applications.
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