Preparation of Cu-NiCoP microspheres and their supercapacitive performance

doi:10.19799/j.cnki.2095-4239.2022.0555

Abstract

Abstract:

Transition metal phosphides (TMPs) are promising supercapacitor electrode materials due to their high electrical conductivity and large specific capacitance. In this study, the Cu-NiCoP microspheres were prepared from solvothermal and phosphating reactions, and the effect of Cu doping on the electrochemical properties of NiCoP was explored. The results of this study show that the electrochemical properties of the material are the best when the amount of Cu doping is 5% with the associated specific capacitance reaching 1500 F/g(at a current density of 1 A/g), which is much higher than that of the undocumented NiCoP microspheres (the specific capacitance is 1025 F/g at a current density of 1 A/g). The 5% Cu-NiCoP and activated carbon are assembled into asymmetric supercapacitors (ASC) with positive and negative electrodes, respectively. The assembled ASC devices demonstrate supreme cycle life stability with a capacity retention of 76% after 9200 cycles at a current density of 2 A/g. The ASC devices also show desirable multiplier performance, with a high energy density of 84 Wh/kg at a power density of 750 W/kg. Therefore, this work suggests that Cu doping can effectively improve the electrochemical properties of NiCoP electrodes, and Cu-NiCoP has the potential to be used as cathode materials in supercapacitor energy storage.

Key words: phosphide, microsphere, asymmetric supercapacitor, electrochemical performance

CLC Number:

TB 34

Ke XU, Juexi CHEN, Yao MENG, Zhiye YUAN, Xingyan WANG. Preparation of Cu-NiCoP microspheres and their supercapacitive performance[J]. Energy Storage Science and Technology, 2023, 12(2): 357-365.

Figures/Tables 4

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