Active Sites for Light Driven Proton Reduction in Y2Ti2O7 and CsTaWO6 Pyrochlore Catalysts Detected by In Situ EPR

作者：Hollmann Dirk^*; Merka Oliver; Schwertmann Larissa; Marschall Roland; Wark Michael; Brueckner Angelika

来源：Topics in Catalysis, 2015, 58(12-13): 769-775.

DOI：10.1007/s11244-015-0415-8

• EPR
• Mechanism
• Electron transfer
• Pyrochlore
• Photocatalysis

In situ EPR spectroscopy proved to be a versatile tool to identify active sites for photocatalytic hydrogen generation in modified Y2Ti2O7 and CsTaWO6 catalysts 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.

• 出版日期2015-9