3D interconnected ultrathin cobalt selenide nanosheets as cathode materials for hybrid supercapacitors

3D interconnected ultrathin cobalt selenide nanosheets as cathode materials for hybrid supercapacitors
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3D互连超薄硒化钴纳米片作为混合超级电容器的阴极材料

DOI:
10.1016/j.electacta.2018.02.146
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发表时间:
2018-04
影响因子:
6.6
通讯作者:
Yong Liu
Yong Liu
中科院分区:
材料科学2区
文献类型:
--
作者:
Yirong Zhu;Zhaodong Huang;Zhongliang Hu;Liujiang Xi;Xiaobo Ji;Yong Liu

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本发明通过水热合成方法制备了三维互联的CoSe纳米片,并首次将其用作上级类电池电极材料。由于独特的3D互连CoSe纳米片具有大的BET比表面积、上级介孔结构和良好的导电性的特征,所得到的3D互连CoSe纳米片在1 A g-1下表现出70.6 mAh g-1的高比容量和显著的倍率性能,与1 A g-1相比,在100 A g-1下的容量留存率为52.8%。此外,一种新型的水混合超级电容器组装通过采用三维互连的SnO_2 CoSe纳米片和活性炭作为阴极和阳极,分别。组装后的混合动力装置在比功率为750 W kg− 1时的比能量为18.6 Wh kg− 1,在5 A g−1下循环20000次,初始容量保持率为95.4%。这些结果意味着独特的3D互连的Co-CoSe纳米片可以被认为是混合超级电容器的高度潜在的候选电极材料。
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−1at 1 A g−1and remarkable rate performance with 52.8% of capacity retention rate at 100 A g−1compared 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 18.6 Wh kg−1at a specific power of 750 W kg−1and 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.
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