Visible Light Driven ZnFe2Ta2O9 Catalyzed Decomposition of H2S for Solar Hydrogen Production

Bulletin of the Korean chemical society

Bharat B. Kale¹  Jin-Ook Baeg¹  Esakkiappan Subramanian¹  Ki-jeong Kong¹  Sang-Jin Moon¹  Sang Mi Lee¹ 

关键词: ZnFe2Ta2O9;    Photocatalyst;    H2S decomposition;    Solar hydrogen;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Tantalum-containing metal oxides, well known for their efficiency in water splitting and H₂ production, have never been used in visible light driven photodecomposition of H₂S and H₂ production. The present work is an attempt in this direction and investigates their efficiency. A mixed metal oxide, ZnFe₂Ta₂O₉, with the inclusion of Fe₂O₃ to impart color, was prepared by the conventional ceramic route in single- and double-calcinations (represented as ZnFe₂Ta₂O₉-SC and ZnFe₂Ta₂O₉-DC respectively). The XRD characterization shows that both have identical patterns and reveals tetragonal structure to a major extent and a minor contribution of orthorhombic crystalline system. The UV-visible diffuse reflection spectra demonstrate the intense, coherent and wide absorption of visible light by both the catalysts, with absorption edge at 650 nm, giving rise to a band gap of 1.9 eV. Between the two catalysts, however, ZnFe₂Ta₂O₉-DC has greater absorption in almost the entire wavelength region, which accounts for its strong brown coloration than ZnFe₂Ta₂O₉-SC when viewed by the naked eye. In photocatalysis, both catalysts decompose H₂S under visible light irradiation (�? �? 420 nm) and produce solar H₂ at a much higher rate than previously reported catalysts. Nevertheless, ZnFe₂Ta₂O₉-DC distinguishes itself from ZnFe₂Ta₂O₉-SC by exhibiting a higher efficiency because of its greater light absorption. Altogether, the tantalum-containing mixed metal oxide proves its efficient catalytic role in H₂S decomposition and H₂ production process also.

【 授权许可】

Unknown