| Summary: | Pt, as a common cocatalyst, has been widely used in photocatalytic H<sub>2</sub> evolution. However, the specific role of Pt in photocatalytic H<sub>2</sub> evolution has not been thoroughly studied. In this paper, by employing three Pt sources with different charges (positive, negative and neutral), we systematically studied the charge effect of Pt sources on photocatalytic H<sub>2</sub> evolution via TiO<sub>2</sub> catalyst. According to the results of Raman, X-ray photoelectron spectroscopy (XPS), recycle experiments and photocurrent characterizations, it was found that TiO<sub>2</sub> would produce electropositive defects during photocatalytic H<sub>2</sub> evolution, inevitably leading to the decline of H<sub>2</sub> production activity. Thanks to the electrostatic interaction, the electronegative Pt source not only promoted charge separation, but preferential deposited on electropositive defects, which acted as the defect repair agent, and thus resulted in the increased photocatalytic stability. This work may provide a new perspective for enhancing photocatalytic stability of hydrogen production.
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