Hydrogen as a new energy plays a vital role in the future energy development.Hydrogen production from electrolyzed water includes two reactions of hydrogen evolution and oxygen evolution, which has the advantages of low price, no pollution, abundant reserves, and the oxygen evolution reaction is a rapid step in hydrogen production from electrolyzed water. A simple co⁃precipitation method was proposed to recombine carbon materials onto Co9S8 catalytic materials, and the oxygen evolution properties were characterized. Compared with Co9S8 without composite carbon material, a small amount of carbon material could significantly improve the oxygen production performance of Co9S8.The structure, morphology and electrochemical properties of the materials were tested by X⁃ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), polarization curves, chronoamperometry and AC impedance. The results show that the prepared Co9S8/C material has no impurity phase. When the current intensity is 10 mA/cm2, the overpotential is 350 mV, and the Tafel slope is 102 mV/dec, it has high electrocatalytic oxygen production performance.