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The effect of CdS content on the photo-induced improvement of hydrogen evolution reaction activity of the Pt/CdS electrocatalyst was investigated.Although the electrons transferred from CdS to Pt in the Pt/CdS electro-catalyst increased with the CdS content under illumination,the electrochemical active surface area of the Pt/CdS electrocatalyst decreased with the CdS content,resulting that the photo-induced improvement of hydrogen evolution reaction activity of the Pt/CdS electrocatalyst decreased with the CdS content.