Abstract
We have investigated the role of Ag in the AgyMn1−x−yCdxS during photocatalytic H2 evolution under visible light irradiation (λ>420nm). The rate of H2 evolution increased with the amount of Ag doping, and reached a maximum at y=0.003 (x=0.40). AgyMn1−x−yCdxS consisted of a highly crystalline solid solution phase over the range 0.48≤x≤0.63 and 0≤y≤0.02, suggesting that the effect of Ag on the photocatalytic activity is not associated with crystallinity. UV–vis absorption spectra of AgyMn1−x−yCdxS showed a band gap absorption at 500nm and a flat absorption above 500nm. The latter absorption was caused by the presence of Ag2S, which does not significantly contribute to the photocatalytic activity. X-ray photoelectron spectroscopy detected metallic Ag on the surface of Ag0.003Mn0.40Cd0.60S, which could act as a co-catalyst in photocatalytic hydrogen evolution.
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