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Ultralayered core–shell metal oxide nanosheet arrays for supercapacitors with long-term electrochemical stability†
Sustainable Energy & Fuels ( IF 5.6 ) Pub Date : 2018-07-03 00:00:00 , DOI: 10.1039/c8se00290h
Dandan Han 1, 2, 3, 4, 5 , Ye Shen 1, 2, 3 , Yifan Pan 1, 2, 3 , Zhenyu Cheng 1, 2, 3 , Yen Wei 3, 4, 5, 6, 7 , Guangjian Zeng 3, 4, 8, 9 , Liucheng Mao 3, 4, 8, 9
Affiliation  

High-stability electrodes are highly desirable for practical supercapacitor applications, which is closely linked with the high utilization and degradation of active materials. Herein, core/shell ultralayered Co3O4@NiO nanosheet arrays were developed by a two-step low temperature hydrothermal method. A porous and thin NiO shell was epitaxially grown on the surface of an ultralayered Co3O4 nanosheet. As a supercapacitor electrode material with good electrochemical performance, the prepared ultralayered Co3O4@NiO core/shell nanosheet array electrode demonstrated a notably enhanced specific capacitance (715 F g−1 at 0.5 A g−1) compared with the pure Co3O4 nanosheets. The elegant combination of NiO and Co3O4 nanostructures in the nanosheet arrays showed promising synergistic effects for capacitors with greatly enhanced performance (30.2 W h kg−1 at a power density of 201.5 W h kg−1) and good cycling stability with 102% of the initial capacitance after 6000 cycles. The as-prepared core/shell ultralayered Co3O4@NiO nanosheet arrays with enhanced performance could be considered as a promising electrode material for high-performance supercapacitors.

中文翻译:

用于超级电容器的具有长期电化学稳定性的超层核-壳金属氧化物纳米片阵列

对于实际的超级电容器应用来说,高稳定性电极是非常需要的,这与活性材料的高利用率和降解密切相关。在此,通过两步低温水热法开发了核/壳超层Co 3 O 4 @NiO纳米片阵列。在超层Co 3 O 4纳米片的表面上外延生长多孔且薄的NiO壳。由于具有良好的电化学性能的超级电容器的电极材料,将制备的ultralayered钴3 ö 4 @NiO核/壳纳米片阵列电极表现出了显着增强的比电容(715 F G -1在0.5 A克-1)与纯Co 3 O 4纳米片相比。NiO和Co的组合优雅3 ö 4在纳米片的纳米结构的阵列表现出有希望用于具有大大增强的性能的电容器的协同作用(30.2 W时千克-1在201.5 W时kg的功率密度-1)和良好的循环稳定性与102 6000次循环后的初始电容的%。制备的具有增强性能的核/壳超层Co 3 O 4 @NiO纳米片阵列可以被认为是用于高性能超级电容器的有前途的电极材料。
更新日期:2018-07-03
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