Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 51, Pages 14201-14205Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201408493
Keywords
co-catalyst; hydrogenation; titanium(III); TiO2; water splitting
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Funding
- ERC
- DFG
- Erlangen DFG cluster of excellence (EAM)
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The high-pressure hydrogenation of commercially available anatase or anatase/rutile TiO2 powder can create a photocatalyst for H-2 evolution that is highly effective and stable without the need for any additional co-catalyst. This activation effect cannot be observed for rutile; however, for anatase/rutile mixtures, a strong synergistic effect can be found (similar to results commonly observed for noble-metal-decorated TiO2). EPR and PL measurements indicated the intrinsic co-catalytic activation of anatase TiO2 to be due to specific defect centers formed during hydrogenation. These active centers can be observed specifically for high-pressure hydrogenation; other common reduction treatments do not result in this effect.
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