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

DOI

32

Citations

55

References

2018

Year

Jingjing Yuan, Xiaoke Zheng, Dachuan Yao, Ling Jiang, Ya Li, Jianfei Che, Guangyu He, Haiqun Chen
Dalton Transactions

Abstract

Nickel phosphate (Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>) is a promising electrode material for electrochemical capacitors, but the low intrinsic electrical conductivity and poor rate capability of Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> are the main challenges. To tackle these problems, amorphous mesoporous Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> with a pore diameter of 2-10 nm is grown on reduced graphene oxide (rGO), and a Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/rGO composite is obtained via a facile hydrothermal-calcination method in this work. The Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/rGO composite calcined at 300 °C (Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/rGO-300) possesses a uniform particle size and a high specific surface area of 198.72 m<sup>2</sup> g<sup>-1</sup>. Benefiting from the structural characteristics, the synergistic effect of components and the high specific surface area, the Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/rGO-300 composite exhibits an extremely high specific capacitance of 1726 F g<sup>-1</sup> at 0.5 A g<sup>-1</sup> and an excellent rate capability of 850 F g<sup>-1</sup> at 25 A g<sup>-1</sup>. In addition, the assembled Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/rGO-300//activated carbon asymmetric electrochemical capacitor delivers a good energy density of 57.42 W h kg<sup>-1</sup> at a power density of 160 W kg<sup>-1</sup>. Compared with Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/rGO composites calcined at other temperatures and other nickel-phosphorus compounds reported in the literature, the Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>/rGO-300 composite containing amorphous mesoporous Ni<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> exhibits superior electrochemical performance, representing a new kind of electrode material for electrochemical capacitors.

References

YearCitations

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