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Photoinduced Defect and Surface Chemistry of Niobium Tellurium Oxides ANbTeO6 (A = K, Rb, Cs) with Defect-Pyrochlore
Morten Weiss1, Benedikt Wirth1, Roland Marschall1
1Department of Chemistry, University of Bayreuth, Universitaetsstrasse 30, 95440 Bayreuth, Germany.
Abstract:
The niobium tellurium oxides ANbTeO6 with varying A cations (A = K, Rb, Cs) and defect-pyrochlore crystal structure were used to investigate the effect of A on crystal-structure deformation and defect-chemistry. We show that the light absorption of these compounds in visible light is due to defects and not the effect of a low band gap. Using the materials in photocatalytic hydrogen generation, the prevailing defects and the surface composition change significantly during photocatalytic hydrogen evolution.
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