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Photocatalytic hydrogen production from water splitting production is a promising strategy to solve the energy crisis and environmental pollution. In the present work, Co₃O₄/CdS composites were prepared by ultrasonication and stirring, and used for photocatalytic water splitting. The results showed a Co-S chemical bonds were formed at the interfaces between the Co₃O₄ and the CdS, which promoted the charge transfer rate between the CdS and Co₃O₄. Meanwhile, the recombination of the electron-hole pairs was further restrained by the Co₃O₄/CdS p-n heterojunction. The 10%-Co₃O₄/CdS composites exhibited an excellent photocatalytic hydrogen production rate of 142.62 μmol∙h⁻¹, which was 20 times higher than that of CdS (6.85 μmol∙h⁻¹), and the Co₃O₄/CdS showed excellent stability in the photocatalytic water splitting reaction. Moreover, a formation process of Co₃O₄/CdS p-n heterojunction and a …