Active Sites for Light Driven Proton Reduction in Y2Ti2O7 and CsTaWO6 Pyrochlore Catalysts Detected by In Situ EPR
Active Sites for Light Driven Proton Reduction in Y2Ti2O7 and CsTaWO6 Pyrochlore Catalysts Detected by In Situ EPR
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DOI：
10.1007/s11244-015-0415-8
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发表时间：
2015-07
影响因子：
3.6
通讯作者：
D. Hollmann;O. Merka;Larissa Schwertmann;R. Marschall;M. Wark;A. Brückner
中科院分区：
文献类型：
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作者：
D. Hollmann;O. Merka;Larissa Schwertmann;R. Marschall;M. Wark;A. Brückner
摘要原位EPR光谱被证明是一种通用的工具，以确定在改性的烧绿石结构的Y2 Ti 2 O 7和CsTaWO 6催化剂的光催化制氢的活性中心，其中金属阳离子位于两个不同的位置A和B。结果发现，B-位完全占据钛（Y2 Ti 2 O 7）和钽/钨（CsTaWO 6）作为电子陷阱的表面上。从这些位点，电子转移到助催化剂进行。因此，B位负责光催化水还原。图形摘要
AbstractIn situ EPR spectroscopy proved to be a versatile tool to identify active sites for photocatalytic hydrogen generation in modified Y2Ti2O7and CsTaWO6catalysts of pyrochlore structure, in which the metal cations are located in two different positions A and B. It was found that the B-sites exclusively occupied by titanium (Y2Ti2O7) and tantalum/tungsten (CsTaWO6) act as electron traps on the surface. From these sites, electron transfer to the co-catalysts proceeds. Thus, the B-sites are responsible for photocatalytic water reduction.Graphical Abstract