Hydrogenated anatase: Strong photocatalytic H2 evolution without the use   of a co-catalyst
  In the present work we show, how a high pressure hydrogenation of commercial anatase or anatase/rutile powder can create a photocatalyst for hydrogen evolution that is highly effective and stable without the need of any additional co-catalyst. This activation effect can not be observed for rutile. For anatase/rutile mixtures, however, a strong synergistic effect is found (similar to findings commonly observed for noble metal decorated TiO2). ESR measurements indicate the intrinsic co-catalytic activation of anatase TiO2 to be due to specific defect centers formed during hydrogenation. 
Ning Liu, Christopher Schneider, Detlef Freitag, Umamaheswari   Venkatesan, V. R. Reddy Marthala, Martin Hartmann, Benjamin ...
physics.chem-ph