期刊
ELECTROCHIMICA ACTA
卷 269, 期 -, 页码 30-37出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.02.146
关键词
CoSe; 3D interconnected; Ultrathin nanosheets; Mesoporous structure; Hybrid supercapacitor
资金
- National Natural Science Foundation of China [21601057]
- China Post-doctoral Science Foundation [2017T100608, 2016M602425]
- Scientific Research Fund of Hunan Provincial Education Department [16C0462]
3D interconnected ultrathin CoSe nanosheets are prepared via a hydrothermal synthesis method and utilized as superior battery-like electrode material for the first time. Due to the features of the unique 3D interconnected ultrathin nanosheets with a large BET specific surface area, superior mesoporous structure and good electrical conductivity, the as-resulted 3D interconnected ultrathin CoSe nanosheets manifests a high specific capacity of 70.6 mAh g(-1) at 1 A g(-1) and remarkable rate performance with 52.8% of capacity retention rate at 100 A g(-1) compared with 1 A g(-1). Furthermore, a novel aqueous hybrid supercapacitor is assembled by employing 3D interconnected ultrathin CoSe nanosheets and activated carbon as the cathode and anode, respectively. The assembled hybrid device displays a specific energy of 18.6Wh kg(-1) at a specific power of 750Wkg(-1) and outstanding cycling life with 95.4% of the initial capacity retention for 20000 cycles at 5 A g(-1). These results imply that the unique 3D interconnected ultrathin CoSe nanosheets can be considered as highly potential candidate electrode materials for hybrid supercapacitors. (C) 2018 Elsevier Ltd. All rights reserved.
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