Meng Suci, Wang Yintao, He Jingjing, Quan Wei, Gao Menghan, Jiang Deli, Chen Min
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013 People's Republic of China.
Nanotechnology. 2020 May 1;31(29):295403. doi: 10.1088/1361-6528/ab81c7. Epub 2020 Mar 20.
In this study, a three-dimensional (3D) hierarchical CoO@NiS core-shell heterostructure supported on nickel foam (NF) has been constructed. This CoO@NiS/NF can directly serve as a binder-free electrode for a pseudocapacitor, which could achieve a high specific capacitance of 1395.3 F g at a current density of 1 A g in 6 M KOH electrolyte, and an ideal rate capability of 711 F g at a current density of 10 A g. Additionally, the electrode has a high capacitance retention of 89.9% after 5000 cycles. The asymmetric supercapacitor exhibits the maximum energy density of 61.34 W h kg at a power density of 800 W kg, as well as an excellent cycling life of 89.3% capacitance retention. The enhanced electrochemical performance can be mainly ascribed to the special 3D core-shell nanowire arrays nanostructure with great conductivity, enlarged surface area, abundant accessible active sites and intrinsic stability. We anticipate that the present CoO@NiS/NF could be a promising electrode material for energy storage applications.
在本研究中，构建了一种负载在泡沫镍（NF）上的三维（3D）分级CoO@NiS核壳异质结构。这种CoO@NiS/NF可直接用作赝电容器的无粘结剂电极，在6M KOH电解液中，电流密度为1 A g时，其比电容可达1395.3 F g，电流密度为10 A g时，倍率性能理想，比电容为711 F g。此外，该电极在5000次循环后具有89.9%的高电容保持率。不对称超级电容器在功率密度为800 W kg时，最大能量密度为61.34 W h kg，并且具有89.3%的电容保持率的优异循环寿命。电化学性能的增强主要归因于特殊的3D核壳纳米线阵列纳米结构，其具有高导电性、更大的表面积、丰富的可及活性位点和内在稳定性。我们预计，目前的CoO@NiS/NF可能是一种用于储能应用的有前景的电极材料。
