期刊
RSC ADVANCES
卷 6, 期 48, 页码 42633-42642出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra04462j
关键词
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资金
- National Science Foundation of China (NSFC) [51372195]
- CSS project [YK20150602006]
- Ministry of Science and Technology of China through a 973-Project [2012CB619401]
- Fundamental Research Funds for the Central Universities [2013JDGZ03]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT13034]
- One Thousand Youth Talents program
In this work, porous nickel cobalt sulfide electrode materials with different Ni-Co ratios were successfully synthesized through a simple and efficient coprecipitation method. Benefiting from the high electronic conductivity, loosely porous morphology and cooperative redox reactions of the as-prepared electrode materials, the nickel cobalt sulfide electrode materials with the Ni/Co ratio being 2 : 1 exhibit high specific capacitance (1259 F g(-1) at 1 A g(-1)), excellent rate capability (945 F g(-1) at 50 A g(-1)) and long cycling life (90.0% retention after 2000 cycles). Additionally, the asymmetric device, using the nickel cobalt sulfide electrode materials with the Ni/Co ratio being 2 : 1, fabricated in this work deliver a high energy density of 44.44 W h kg(-1) at a power density of 954.14 W kg(-1) and a high power density of 23.853 kW kg(-1) at an energy density of 25.6 W h kg(-1), and also show excellent cycling stability. Our results may pave the way for employing transition metal sulfides for advanced energy storage systems through a low-cost coprecipitation method.
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