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Issue 37, 2018
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Amorphous mesoporous nickel phosphate/reduced graphene oxide with superior performance for electrochemical capacitors

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Abstract

Nickel phosphate (Ni3(PO4)2) is a promising electrode material for electrochemical capacitors, but the low intrinsic electrical conductivity and poor rate capability of Ni3(PO4)2 are the main challenges. To tackle these problems, amorphous mesoporous Ni3(PO4)2 with a pore diameter of 2–10 nm is grown on reduced graphene oxide (rGO), and a Ni3(PO4)2/rGO composite is obtained via a facile hydrothermal-calcination method in this work. The Ni3(PO4)2/rGO composite calcined at 300 °C (Ni3(PO4)2/rGO-300) possesses a uniform particle size and a high specific surface area of 198.72 m2 g−1. Benefiting from the structural characteristics, the synergistic effect of components and the high specific surface area, the Ni3(PO4)2/rGO-300 composite exhibits an extremely high specific capacitance of 1726 F g−1 at 0.5 A g−1 and an excellent rate capability of 850 F g−1 at 25 A g−1. In addition, the assembled Ni3(PO4)2/rGO-300//activated carbon asymmetric electrochemical capacitor delivers a good energy density of 57.42 W h kg−1 at a power density of 160 W kg−1. Compared with Ni3(PO4)2/rGO composites calcined at other temperatures and other nickel–phosphorus compounds reported in the literature, the Ni3(PO4)2/rGO-300 composite containing amorphous mesoporous Ni3(PO4)2 exhibits superior electrochemical performance, representing a new kind of electrode material for electrochemical capacitors.

Graphical abstract: Amorphous mesoporous nickel phosphate/reduced graphene oxide with superior performance for electrochemical capacitors

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Supplementary files

Article information


Submitted
05 Jun 2018
Accepted
15 Aug 2018
First published
16 Aug 2018

Dalton Trans., 2018,47, 13052-13062
Article type
Paper

Amorphous mesoporous nickel phosphate/reduced graphene oxide with superior performance for electrochemical capacitors

J. Yuan, X. Zheng, D. Yao, L. Jiang, Y. Li, J. Che, G. He and H. Chen, Dalton Trans., 2018, 47, 13052
DOI: 10.1039/C8DT02304B

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