A novel three-dimensional hierarchical NiCo2O4/Ni2P electrode for high energy asymmetric supercapacitor

By H. Jia, Liangliang Qi, Li Chen, Yingying Song, Zheng Haoran, Jianguo Zhao, Weiying Zhang, Xianming Liu, Zhongli Liu, Y. Liu. Chemical Engineering Journal, 2018

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Abstract Herein, a novel three-dimensional hierarchical NiCo2O4/Ni2P structure is successfully fabricated through a facile hydrothermal and subsequent electrodeposition process. One-dimensional Ni2P nanoneedles decorate on two-dimensional NiCo2O4 nanosheets can effectively enhance the electrical conductivity and surface area of NiCo2O4 to promote fast Faradaic reaction. The optimized NiCo2O4/Ni2P-30 electrode exhibits a high specific capacity of 2900 F g−1 at 0.008 A cm−2. Moreover, an asymmetric supercapacitor (ASC) is fabricated by using the NiCo2O4/Ni2P-30 as positive electrode and activated carbon as the negative electrode, the device achieves an excellent electrochemical property with the energy density of 40.7 W h kg−1 at 800 W kg−1. Besides, the as-assembled device also exhibits an excellent cycling performance of ∼92.0% of initial capacitance after 5000 cycles indicating its outstanding conductivity and structural stability. All of the results demonstrate that the hierarchical NiCo2O4/ Ni2P composites are electrodes in energy storage application.

Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials

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