Amorphous nickel phosphate as a high performance electrode material for supercapacitor

• Published in: Synthetic metals 2023-01, Vol.292, p.117217, Article 117217
• Main Authors: Wang, Xinwei, Zhai, Xuejie, Lv, Pai, Jiao, Yanxia, Wang, Shunhua, Chi, Junhong
• Format: Article
• Language: English
• Subjects: Amorphous; Nickel phosphate; Supercapacitor
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2022.117217

Amorphous NiHPO4•3 H2O is successfully synthesized by a conventional chemical precipitation method at room temperature. It is delivered at a high specific capacity of about 2191 F g−1 at 0.5 A g−1. The cycle performance is illustrated by the asymmetric capacitor. It is also delivered the good cycling stability and the specific capacitance maintained 101% of the initial capacitance (731 F g−1) after 500 cycles. And its energy density and power density of NiHPO4•3 H2O are as high as 112 Wh kg−1 and 501 W kg−1, respectively. A lot of nano-scale microspheres, and mesoporous contributed to its high specific capacitance. On account of amorphous structure, produces acquires the excellent cycle performance which may efficiently enhance the electron transfer, ease volume expansion and achieve the performance improvement. It is indicated that amorphous nickel phosphate has a great potential application as electrode materials for energy storage. •Amorphous NiHPO4•3 H2O was successfully synthesized by a conventional chemical precipitation method at room temperature.The preparation method is simple and effective. Amorphous NiHPO4•3 H2O delivered at a high specific capacity of about 2191 Fg−1 at 0.5 A·g−1. It is also delivered the good cycling stability and the specific capacitance maintained 101 % of the initial capacitance (731 F g−1) after 500 cycles.•A lot of nano-scale microspheres, and mesopores contributed to its high specific capacitance.•Amorphous materials provide more active sites and maintain better structural stability. The morphology of microspheres provides a larger specific surface area and thus increases specific capacity.