Liu Yan, Fan Xiaoyan, Zhang Zikun, Li Chun, Zhang Shuaiyi, Li Zhenjiang, Liu Lin
School of Mathematics and Physics, Qingdao University of Science and Technology, Qingdao 266061, Shandong, People's Republic of China.
College of Physics and Optoelectronic Engineering, Ocean University of China, Qingdao 266100, Shandong, People's Republic of China.
Nanotechnology. 2023 Sep 4;34(47). doi: 10.1088/1361-6528/acefd7.
Oxygen doping strategy is one of the most effective methods to improve the electrochemical properties of nickel-cobalt phosphide (NiCoP)-based capacitors by adjusting its inherent electronic structure. In this paper, O-doped NiCoP microspheres derived from porous nanostructured nickel metal-organic frameworks (Ni-MOFs) were constructed through solvothermal method followed by phosphorization treatment. The O-doping concentration has a siginificant influence on the rate performance and cycle stability. The optimized O-doped NiCoP electrode material shows a specific capacitance of 632.4 F-gat 1 A-gand a high retention rate of 56.9% at 20 A g. The corresponding NiCoP-based asymmetric supercapacitor exhibits a high energy density of 30.1 Wh kgwhen the power density is 800.9 W kg, and can still maintain 82.1% of the initial capacity after 10 000 cycles at 5 A g.
