Cai Bin, Li Jialun, Wang Liying, Li Xuesong, Yang Xijia, Lü Wei
Key Laboratory of Advanced Structural Materials, Ministry of Education & Advanced Institute of Materials Science, Changchun University of Technology, Changchun, Changchun 130012, People's Republic of China.
Nanotechnology. 2022 Apr 29;33(29). doi: 10.1088/1361-6528/ac61ce.
While supercapacitors have been widely studied as the next generation of energy storage devices, to develop active electrode materials for enhancing device performance is still challenging. Herein, we fabricated asymmetric supercapacitors based on NiZn-Layered double hydroxide (LDH) @NiCoSehierarchical nanostructures as electrode materials. The NiZn-LDH@NiCoSecomposites are deposited on Ni foam by a two-step strategy, in which NiZn-LDH nanosheets were firstly grown on Ni foam by hydrothermal method, and then NiCoSeparticles were prepared by electrodeposition. Due to the synergistic effect between NiZn-LDH and NiCoSe, excellent device performance was achieved. In a three-electrode system, the NiZn-LDH@NiCoSeexhibits a specific capacitance of 2980 F gat 1 A g. Furthermore, the asymmetric supercapacitor of NiZn-LDH@NiCoSe//activated carbon (AC) device was assembled, which exhibits the energy density of 49.2 Wh kgat the power density of 160 W kg, with the capacity retention rate is 91% after 8000 cycles. The results indicates that NiZn-LDH@NiCoSeis a promising candidate as electrode materials for efficient energy storage devices.
虽然超级电容器作为下一代储能装置已得到广泛研究，但开发用于提高器件性能的活性电极材料仍然具有挑战性。在此，我们制备了基于NiZn层状双氢氧化物（LDH）@NiCoSe分级纳米结构作为电极材料的不对称超级电容器。NiZn-LDH@NiCoSe复合材料通过两步策略沉积在泡沫镍上，其中首先通过水热法在泡沫镍上生长NiZn-LDH纳米片，然后通过电沉积制备NiCoSe颗粒。由于NiZn-LDH和NiCoSe之间的协同效应，实现了优异的器件性能。在三电极系统中，NiZn-LDH@NiCoSe在1 A g时表现出2980 F g的比电容。此外，组装了NiZn-LDH@NiCoSe//活性炭（AC）器件的不对称超级电容器，其在功率密度为160 W kg时表现出49.2 Wh kg的能量密度，在8000次循环后容量保持率为91%。结果表明，NiZn-LDH@NiCoSe是一种有前途的高效储能器件电极材料候选者。
