期刊
NANOSCALE
卷 10, 期 6, 页码 2735-2741出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr07931a
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资金
- National Natural Science Foundation of China [21471086, 51572272]
- Science and Technology Department of Zhejiang Province [2017C33007]
- Scientific Research Foundation of the Education Department of Zhejiang Province [Y201635167]
- Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering [2016-09]
- Natural Science Foundation of Ningbo [2017A610062]
- K. C. Wong Magna Fund in Ningbo University
Porous nanosheet-structured electrode materials are very attractive for the high efficiency storage of electrochemical energy. Herein, a porous cobalt sulfide nanosheet array on Ni foam (Co9S8-NSA/NF) is successfully fabricated by a facile method, which involves the uniform growth of 2D Co-based leaf-like zeolitic imidazole frameworks (Co-ZIF-L) on Ni foam followed by subsequent sulfurization with thioacetamide (TAA). Benefiting from the unique porous nanosheet array architecture and conductive substrate, the Co9S8-NSA/NF exhibits excellent electrochemical performance with a high capacitance (1098.8 F g(-1) at 0.5 A g(-1)), good rate capacity (54.6% retention at 10 A g(-1)) and long-term stability (87.4% retention over 1000 cycles), when acted as a binder-free electrode for supercapacitors. Furthermore, an assembled asymmetric supercapacitor device using the as-fabricated Co9S8-NSA as the positive electrode and activated carbon (AC) as the negative electrode also exhibits a high energy density of 20.0 W h kg(-1) at a high power density of 828.5 W kg(-1). The method developed here can be extended to the construction of other structured metal (mono or mixed) sulfide electrode materials for more efficient energy storage.
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