Cd_{1鈭?span style='font-style: italic'>x}Zn_xS solid solutions supported on ordered mesoporous silica (SBA-15): Structural features and photocatalytic activity under visible light

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• 作者：S.A. Mací ; as-S&aacute ; nchez^a ; R. Nava^a ; ^{rufino@uaq.mx} ; V. Hern&aacute ; ndez-Morales^a ; Y.J. Acosta-Silva^a ; L. Gó ; mez-Herrera^a ; B. Pawelec^b ; S.M. Al-Zahrani^c ; R.M. Navarro^b ; J.L.G. Fierro^b
• 关键词：Photocatalyst ; Hydrogen ; Cd1&minus ; xZnxS ; SBA-15
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：July, 2012
• 卷：37
• 期：13
• 页码：9948-9958
• 文件大小：1195 K

摘要

A series of Cd_1鈭?em>xZn_xS (x聽=聽0.05-0.3) photocatalysts supported on ordered mesoporous silica (SBA-15) were prepared and investigated for hydrogen production from water splitting under visible light. Textural, structural and surface photocatalyst properties are determined by N₂ adsorption isotherms, UV-vis, Raman and XPS and related to the activity results in hydrogen production. Raman and XRD results indicated a mutual interaction between Cd and Zn, forming nanoparticles of Cd_1鈭?em>xZn_xS solid solutions. All Cd_1鈭?em>xZn_xS/SBA-15 samples showed relatively high activities for hydrogen evolution. The hydrogen production rate is found to increase gradually when the zinc concentration on photocatalysts increases from 0.05 to 0.2, achieving a maximum for the photocatalyst with zinc concentration equal to 0.2. Variation in photoactivity is discussed in terms of modification in the conduction band and light absorption ability of Cd_1鈭?em>xZn_xS particles derived from the changes in the Zn concentration in the Cd_1鈭?em>xZn_xS solid solution.