materials, the characteristics of Ni-P diffraction peaks are basically
retained, moreover, the three characteristic peaks at around 30.2,36.2 and 64.3
indicate the (220), (311) and (440) reflections of the NiCo2O4phase (PDF 20-0781), demonstrating successful formation
of Ni-P@NiCo2O4composite materials. XPS measurents were also conducted to further confirm the formation of Ni-P@NiCo2O4 composite. As shown in