Stable Co-Catalyst-Free Photocatalytic H2 Evolution From Oxidized Titanium Nitride Nanopowders.
Angew Chem Int Ed Engl
; 54(45): 13385-9, 2015 Nov 02.
Article
em En
| MEDLINE
| ID: mdl-26427346
ABSTRACT
A simple strategy is used to thermally oxidize TiN nanopowder (â¼20â
nm) to an anatase phase of a TiO2Ti(3+)N compound. In contrast to the rutile phase of such a compound, this photocatalyst provides activity for hydrogen evolution under AM1.5 conditions, without the use of any noble metal co-catalyst. Moreover the photocatalyst is active and stable over extended periods of time (tested for 4â
months). Importantly, to achieve successful conversion to the active anatase polymorph, sufficiently small starting particles of TiN are needed. The key factor for catalysis is the stabilization of the co-catalytically active Ti(3+) species against oxidation by nitrogen present in the starting material.
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MEDLINE
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En
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2015
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Article