Ag-doped Mn-Cd sulfide as a visible-light-driven photocatalyst for H-2 evolution

作者：Ikeue Keita^*; Shinmura Yumeki; Machida Masato

来源：Applied Catalysis B: Environmental , 2012, 123: 84-88.

DOI：10.1016/j.apcatb.2012.04.019

• H-2 production
• Sulfide
• Photocatalyst
• Visible light response
• Ag
• Hydrothermal synthesis

We have investigated the role of Ag in the AgyMn1-x-yCdxS during photocatalytic H-2 evolution under visible light irradiation (lambda %26gt; 420 nm). The rate of H-2 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 %26lt;= x %26lt;= 0.63 and 0 %26lt;= y %26lt;= 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 500 nm and a flat absorption above 500 nm. 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.

• 出版日期2012-7-23