Interconnected Co0.85Se nanosheets as cathode materials for asymmetric supercapacitors
Interconnected Co0.85Se nanosheets as cathode materials for asymmetric supercapacitors
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互连Co0.85Se纳米片作为非对称超级电容器阴极材料
DOI：
10.1016/j.jpowsour.2016.11.061
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发表时间：
2017
影响因子：
9.2
通讯作者：
Jianguo Lu
中科院分区：
文献类型：
--
作者：
Jie Yang;Yuliang Yuan;Weicheng Wang;Haichao Tang;Zhizhen Ye;Jianguo Lu
我们开发了一种简单的一步水热方法，直接在泡沫镍上生长互连的Co 0. 85 Se纳米片作为超级电容器的电极。Co 0.85 Se电极具有高的比电容（1A g-1时为1528 F g-1，20 A g-1时为715 F g-1）、优异的循环稳定性（5000次循环后保持率为92%）和良好的导电性。此外，一个不对称的超级电容器（ASC）制造使用Co 0. 85 Se纳米片作为正极和活性炭（AC）作为负极。ASC还表现出优异的电化学性能，具有高能量密度（145 Wh kg-1）、高功率密度（16 kW kg-1）和出色的循环稳定性（5000次循环后损失10.9%）。此外，串联连接的两个ASC能够在仅充电15 s至3.2 V后点亮红色LED至少5 min。这项工作表明，互连的Co0.85Se纳米片与三维多孔结构是有前途的电极，高性能的超级电容器具有大的能量密度。
We develop a facile one-step hydrothermal method to directly grow interconnected Co0.85Se nanosheets on nickel foam as electrode for supercapacitors. The Co0.85Se electrodes exhibit a high specific capacitance (1528 F g-1at 1 A g-1and 715 F g-1at 20 A g-1), excellent cycling stability (92% retention after 5000 cycles) and good conductivity. Moreover, an asymmetric supercapacitor (ASC) is fabricated using Co0.85Se nanosheets as the positive electrode and active carbon (AC) as the negative electrode. The ASC also exhibits excellent electrochemical performance with high energy density (∼45 Wh kg−1), high power density (16 kW kg-1) and remarkable cycling stability (∼10.9% loss after 5000 cycles). Furthermore, two ASCs connected in series are capable of lighting a red LED at least for 5 min after being charged for only 15 s to 3.2 V. This work demonstrates that the interconnected Co0.85Se nanosheets with three-dimensional porous structures are promising electrodes for high-performance supercapacitors with large energy density.