Photocatalytic water splitting by band-gap engineering of solid solution Bi_{1鈭?span style='font-style: italic'>x}Dy_xVO₄ and Bi_0.5M_0.5VO₄ (M = La, Sm, Nd, Gd, Eu, Y)

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• 作者：Qizhao Wang^a ; ^b ; Ning An^a ; Ruijuan Mu^a ; Hui Liu^c ; ^{leolau1979@gmail.com} ; Jian Yuan^b ; Jianwei Shi^b ; Wenfeng Shangguan^b ; ^{shangguan@sjtu.edu.cn} ; ^{qzwang@nwnu.edu.cn}
• 关键词：Bi1&minus ; xDyxVO4 ; Water splitting ; Hydrogen ; Solid solution ; Ultraviolet light
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 May, 2012
• 卷：522
• 期：Complete
• 页码：19-24
• 文件大小：1358 K

摘要

A series of metal oxide solid solutions Bi_1鈭?em>xDy_xVO₄ and Bi_0.5M_0.5VO₄ (M = La, Sm, Nd, Gd, Eu, Y) were synthesized by solid state reaction at high temperature and characterized by XRD, UV-vis DRS, BET, SEM. Bi_1鈭?em>xDy_xVO₄ showed two crystal structures with the component content. For 0.3 鈮?#xA0;x 鈮?.0, the structure was tetragonal type, while that was monoclinic when x = 0. For 0.1 鈮?#xA0;x < 0.3, tetragonal and monoclinic structures had been observed. Bi_1鈭?em>xDy_xVO₄ solid solutions of tetragonal type could split water into H₂ and O₂ simultaneously when loaded with 0.3 wt%Pt and 1 wt%Pt-Cr₂O₃ respectively as cocatalyst. Among these catalysts, Bi_0.5Dy_0.5VO₄ showed the best photocatalytic activity for water splitting under UV light irradiation. Besides, Bi_0.5M_0.5VO₄ (M = La, Sm, Nd, Gd, Eu, Y) were also prepared and discovered to be of tetragonal type as same as Bi_0.5Dy_0.5VO₄. They performed high photocatalytic activities of splitting pure water into H₂ and O₂ under UV light irradiation when loaded with 1 wt%Pt-Cr₂O₃. The activities of Bi_0.5M_0.5VO₄ (M = Dy, La, Sm, Nd, Gd, Eu, Y) solid solutions indicated band-gap engineering of metal oxide solid solutions was the feasible method to obtain a photocatalyst for overall water splitting.