▎ 摘　　要

In this work, three different types of carriers were used: VULCAN XC-72 conductive carbon black, nitrogen and sulphur codoped graphite (NSG) and the graphene-like sheets adsorbed sodium salt of flavin mononucleotide (FMNSC). Catalysts with three kinds of carriers supporting Ni and four Ni-Co alloy catalysts with different Ni-Co ratios were prepared by a simple chemical reduction method. Next, the catalytic process and performance for hydrazine electrooxidation in alkaline media were studied. The structure and morphology of the obtained Ni and Ni-Co alloy catalysts were characterized by X-ray diffraction (XRD), energy dispersive spectrometry (EDS) and X-ray photoelectron spectroscopy (XPS). The electrocatalytic performance of the catalysts toward hydrazine electrooxidation was investigated by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) methods. The results show that the catalytic performance of FMNSG supported NiCo with four different ratios is better than that for the conductive carbon black and nitrogen and sulphur codoped graphite. Otherwise, the catalytic performance of Ni8Co2 alloy catalyst is better than that of the catalysts with other Ni-Co ratios. This finding suggests that the catalytic performance can be improved by adding an appropriate proportion of Co atoms. The EIS results show that electron transfer processes present on the surface and the impedance of preliminary and secondary oxidation is also lower than for other catalysts, showing high catalytic activity. The analysis results of XPS indicate that the high amount of Ni2+ and Co2+ existed on the catalysts may be improve the rate of intermediate ([HO-H2N=NH2-OH](2-)) formation and rate-limiting step, thereby can enhance the electrocatalytic activity.