Three-dimensional NiCo2O4@NiCo2O4 core–shell nanocones arrays for high-performance supercapacitors
Three-dimensional NiCo2O4@NiCo2O4 core–shell nanocones arrays for high-performance supercapacitors
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DOI：
10.1016/j.cej.2018.03.061
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发表时间：
2018-07
影响因子：
15.1
通讯作者：
Xiuhua Wang;Yao Fang;Bo Shi;F. Huang;Fang Rong;R. Que
中科院分区：
文献类型：
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作者：
Xiuhua Wang;Yao Fang;Bo Shi;F. Huang;Fang Rong;R. Que
采用分步水热法在泡沫镍表面制备了高度有序的三维分级NiCo2O4@NiCo2O4核壳结构纳米锥阵列。这种独特的纳米结构是由一层NiCo 2 O 4纳米片均匀地包覆在NiCo 2 O 4纳米锥的表面。当用于超级电容器时，NiCo2O4@NiCo2O4核壳分级纳米结构在1 A g-1的电流密度下表现出2045.2 F g-1的显著电容，这优于NiCo 2 O 4纳米片和NiCo 2 O 4纳米锥的单个组分。此外，通过理论分析揭示了主要的扩散控制存储。制造了基于分级NiCo2O4@NiCo2O4核-壳纳米结构和活性炭的非对称超级电容器装置，并且该装置在0.35 kW kg-1的功率密度下表现出期望的高能量密度，其值为82.95 Wh kg-1。这些结果表明所制备的NiCo2O4@NiCo2O4是电化学超级电容器的优秀候选者。
The highly ordered three-dimensional hierarchical NiCo2O4@NiCo2O4core–shell nanocones arrays on nickel foams are synthesized by stepwise hydrothermal synthesis. The unique nanoarchitectures consist of a layer of NiCo2O4nanosheets well coated on the surface of NiCo2O4nanocones. When used in supercapacitors, the NiCo2O4@NiCo2O4core–shell hierarchical nanostructures exhibit a remarkable capacitance of 2045.2 F g−1at a current density of 1 A g−1, which are better than that of the individual components of NiCo2O4nanosheets and NiCo2O4nanocones. Furthermore, the predominant diffusion-controlled storage is revealed by theoretical analysis. An asymmetric supercapacitor device based on the hierarchical NiCo2O4@NiCo2O4core–shell nanostructure and activated carbon is fabricated and exhibits a desirable high energy densities with a value of 82.95 Wh kg−1at power density of 0.35 kW kg−1. These results indicate that the as-prepared NiCo2O4@NiCo2O4are outstanding candidate for electrochemical supercapacitors.