Journal
JOURNAL OF MATERIALS SCIENCE
Volume 53, Issue 8, Pages 6157-6169Publisher
SPRINGER
DOI: 10.1007/s10853-017-1976-7
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Funding
- Natural Science Foundation of Zhejiang Province [LQ17B010002]
- Natural Science Foundation of Shandong Province [ZR2017BB042]
- China Post-doctoral Science Foundation [2017M612184]
- source innovation plan project for basic application research of Qingdao [17-1-1-25-jch]
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Cobalt-manganese (Co-Mn)-based bimetallic compounds (such as Co-Mn oxides, hydroxides) have been investigated as a new type of high-performance electroactive materials for energy storage device. Nevertheless, Co-Mn sulfides are seldom investigated, especially for those with hierarchical architectures and structures. Herein, we first adopt a facile two-step hydrothermal route and synthesize Co-Mn sulfides with sea urchin-like architecture and nanowire array structure. The anion-exchange sulfuration process gives rise to hierarchical structure with numerous nanosheets grown on the surface. Benefiting from the attractive structures and the high electrochemical activity of Co-Mn sulfides, the Co-Mn sulfides show improved performance than Co-Mn oxides with similar morphology. Especially, the Ni foam-supported Co-Mn sulfide nanowire arrays exhibit superior performance of 502 C g(-1) at 1 A g(-1) as well as excellent cycling stability with 107% of capacity retention after 2000 cycles. In addition, a hybrid supercapacitor Co-Mn sulfide nanowire arrays/RGO displays an energy density of 18.4 Wh kg(-1) at 375 W kg(-1). More importantly, an ultrahigh power density (22.5 kW kg(-1) at 9.5 Wh kg(-1)) and outstanding cycling stability can also be achieved. The excellent electrochemical performance can be ascribed to the attractive structure and high electrochemical activity of Co-Mn sulfide.
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