Photocatalytic water splitting by band-gap engineering of solid solution Bi1−xDyxVO4 and Bi0.5M0.5VO4 (M = La, Sm, Nd, Gd, Eu, Y)
Photocatalytic water splitting by band-gap engineering of solid solution Bi1−xDyxVO4 and Bi0.5M0.5VO4 (M = La, Sm, Nd, Gd, Eu, Y)
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DOI：
10.1016/j.jallcom.2012.01.017
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发表时间：
2012-05
影响因子：
6.2
通讯作者：
Qizhao Wang;N. An;Ruijuan Mu;Hui Liu;Jian Yuan;Jianwei Shi;W. Shangguan
中科院分区：
文献类型：
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作者：
Qizhao Wang;N. An;Ruijuan Mu;Hui Liu;Jian Yuan;Jianwei Shi;W. Shangguan
采用高温固相反应合成了一系列金属氧化物固溶体Bi1−xdyxvo4和Bi0.5M0.5VO4(M=La, Sm, Nd, Gd, Eu， Y)，并用XRD， UV-vis DRS， BET， SEM对其进行了表征。Bi1−xdyxvo4随组分含量的变化呈现出两种晶体结构。当0.3≤x≤1.0时，结构为四方型；当x=0时，结构为单斜型。当0.1≤x<0.3时，观察到四方和单斜结构。当分别负载0.3wt% Pt和1wt% Pt- cr2o3作为助催化剂时，Bi1−xdyxvo4四边形固溶体可以同时将水分解成h2和o2。其中bi0.5 dy0.5 vo4在紫外光照射下对水的分解表现出最好的光催化活性。此外，还制备了Bi0.5M0.5VO4(M=La, Sm, Nd, Gd, Eu， Y)，并发现与Bi0.5Dy0.5VO4相同为四边形。当负载1wt% Pt-Cr2O3时，它们在紫外光照射下将纯水分解成h2和o2，表现出较高的光催化活性。Bi0.5M0.5VO4（M=Dy, La, Sm, Nd, Gd, Eu， Y）固溶体的活性表明，金属氧化物固溶体的带隙工程是获得全面水分解光催化剂的可行方法。
A series of metal oxide solid solutions Bi1−xDyxVO4and Bi0.5M0.5VO4(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. Bi1−xDyxVO4showed two crystal structures with the component content. For 0.3≤x≤1.0, the structure was tetragonal type, while that was monoclinic when x=0. For 0.1≤x<0.3, tetragonal and monoclinic structures had been observed. Bi1−xDyxVO4solid solutions of tetragonal type could split water into H2and O2simultaneously when loaded with 0.3wt% Pt and 1wt% Pt-Cr2O3respectively as cocatalyst. Among these catalysts, Bi0.5Dy0.5VO4showed the best photocatalytic activity for water splitting under UV light irradiation. Besides, Bi0.5M0.5VO4(M=La, Sm, Nd, Gd, Eu, Y) were also prepared and discovered to be of tetragonal type as same as Bi0.5Dy0.5VO4. They performed high photocatalytic activities of splitting pure water into H2and O2under UV light irradiation when loaded with 1wt% Pt-Cr2O3. The activities of Bi0.5M0.5VO4(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.