Visible light active pristine and Fe³⁺ doped CuGa₂O₄ spinel photocatalysts for solar hydrogen production

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• 作者：Karuppasamy Gurunathan ; Jin-Ook Baeg ; Sang Mi Lee ; Esakkiappan Subramanian ; Sang-Jin Moon ; Ki-jeong Kong
• 关键词：Spinels ; Photocatalyst ; ; none ; color ; black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4SG019H-1&_mathId=mml40&_user=1067359&_cdi=5729&_rdoc=4&_acct=C000050221&_version=1&_userid=10&md5=d5c15c13c15e
• 刊名：International Journal of Hydrogen Energy
• 出版年：2008
• 出版时间：June 2008
• 年：2008
• 卷：33
• 期：11
• 页码：2646-2652
• 全文大小：878 K

文摘

Spinel metal oxide photocatalysts, a rarely studied group in visible light driven photocatalytic decomposition of H₂S and solar H₂ production, have been investigated in the present work. d¹⁰ p-block element, Ga containing spinel CuGa₂O₄ in pristine and Fe³⁺doped (CuGa_2-xFe_xO₄, x=0.6) states, was prepared by ceramic route without/with noble metal oxide, NiO/RuO₂ loading to the extent of 1 wt % . XRD analysis reveals a single-phase cubic spinel crystalline structure for all the catalysts. FESEM displays an irregular-shaped grain morphology for CuGa₂O₄ and smaller size almost cubic particles for 33cb6"" title=""Click to view the MathML source"" alt=""Click to view the MathML source"">CuGa_2-xFe_xO₄. Energy dispersive X-ray spectroscopy suggests a chemical composition consistent with the stoichiometric molecular formula. Optically, the catalysts display an intensive light absorption in UV and visible regions with an onset at about 900 nm in the near IR region. Fe³⁺ doping constructively influences the morphology and optical properties of pristine CuGa₂O₄. All these physico-chemical and material characteristics infuse a facile catalytic function into the prepared spinel oxides such that the naked CuGa₂O₄ and CuGa_2-xFe_xO₄ spinels exhibit a moderate to fairly good photocatalytic activity while the co-catalyst-loaded CuGa_2-xFe_xO₄ spinel performs an exceedingly good photocatalytic activity with 15 % quantum efficiency. Thus, the present work leads to the emergence of functionally high performance, stable and visible active photocatalysts in the spinel group for the production of solar hydrogen from H₂S.