Photoinduced Defect and Surface Chemistry of Niobium Tellurium Oxides ANbTeO<sub>6</sub> (A = K, Rb, Cs) with Defect-Pyrochlore Structure
Morten Weiß, Benedikt Wirth, Roland Marschall
Abstract
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.
Topics & Concepts
ChemistryNiobiumPyrochloreTelluriumCrystal structurePhotocatalysisBand gapInorganic chemistryVisible spectrumHydrogenCrystallographyCatalysisOpticsCondensed matter physicsOrganic chemistryPhysicsPhase (matter)Advanced Photocatalysis TechniquesNuclear materials and radiation effectsRadioactive element chemistry and processing