期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 25, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201801080
关键词
Co9S8; energy storage; honeycomb; hybrid supercapacitors; metal-organic frameworks
类别
资金
- National Key R&D Program of China [2016YFB010030X, 2016YFB0700600]
- National Natural Science Foundation of China [51772117, 51732005]
Unique nanostructures always lead to extraordinary electrochemical energy storage performance. Here, the authors report a new strategy for using Metal-organic frameworks (MOFs) derived cobalt sulfide in a carbon matrix with a 3D honeycombed porous structure, resulting in a high-performance supercapacitor with unrivalled capacity of approximate to 1887 F g(-1) at the current density of 1 A g(-1). The honeycomb-like structure of Co9S8@C composite is loosely adsorbed, with plentiful surface area and high conductivity, leading to improved Faradaic processes across the interface and enhanced redox reactions at active Co9S8 sites. Therefore, the heterostructure-fabricated hybrid supercapacitor, using activated carbon as the counter electrode, demonstrates a high energy density of 58 Wh kg(-1) at the power density of 1000 W kg(-1). Even under an ultrahigh power density of 17 200 W kg(-1), its energy density maintains approximate to 38 Wh kg(-1). The hybrid supercapacitor also exhibits suitable cycling stability, with approximate to 90% capacity retention after 10 000 continuous cycles at the current density of 5 A g(-1). This work presents a practical method for using MOFs as sacrificial templates to synthesize metal-sulfides for highly efficient electrochemical energy storage.
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