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Photocatalytic Water Oxidation by a Pyrochlore Oxide upon Irradiation with Visible Light: Rhodium Substitution Into Yttrium Titanate
Author(s) -
Kiss Borbala,
Didier Christophe,
Johnson Timothy,
Manning Troy D.,
Dyer Matthew S.,
Cowan Alexander J.,
Claridge John B.,
Darwent James R.,
Rosseinsky Matthew J.
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201407179
Subject(s) - rhodium , photocatalysis , yttrium , pyrochlore , materials science , dopant , oxide , visible spectrum , titanate , water splitting , irradiation , photochemistry , inorganic chemistry , ceramic , chemistry , catalysis , doping , metallurgy , organic chemistry , optoelectronics , nuclear physics , physics , phase (matter)
A stable visible‐light‐driven photocatalyst ( λ ≥450 nm) for water oxidation is reported. Rhodium substitution into the pyrochlore Y 2 Ti 2 O 7 is demonstrated by monitoring Vegard′s law evolution of the unit‐cell parameters with changing rhodium content, to a maximum content of 3 % dopant. Substitution renders the solid solutions visible‐light active. The overall rate of oxygen evolution is comparable to WO 3 but with superior light‐harvesting and surface‐area‐normalized turnover rates, making Y 2 Ti 1.94 Rh 0.06 O 7 an excellent candidate for use in a Z‐scheme water‐splitting system.