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Tuning Light‐Driven Water Oxidation Efficiency of Molybdenum‐Doped BiVO 4 by Means of Multicomposite Catalysts Containing Nickel, Iron, and Chromium Oxides
Author(s) -
Krysiak Olga A.,
Junqueira João R. C.,
Conzuelo Felipe,
Bobrowski Tim,
Wilde Patrick,
Wysmolek Andrzej,
Schuhmann Wolfgang
Publication year - 2020
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201900701
Subject(s) - molybdenum , nickel , chromium , catalysis , inorganic chemistry , doping , materials science , chemistry , metallurgy , organic chemistry , optoelectronics
Mo‐doped BiVO 4 has emerged as a promising material for photoelectrodes for photoelectrochemical water splitting, however, still shows a limited efficiency for light‐driven water oxidation. We present the influence of an oxygen‐evolution catalyst composed of Ni, Fe, and Cr oxides on the activity of Mo:BiVO 4 photoanodes. The photoanodes are prepared by spray‐coating, enabling compositional and thickness gradients of the incorporated catalyst. Two different configurations are evaluated, namely with the catalyst embedded into the Mo:BiVO 4 film or deposited on top of it. Both configurations provide a significantly different impact on the photoelectrocatalytic efficiency. Structural characterisation of the materials by means of SEM, TEM and XRD as well as the photoelectrocatalytic activity investigated by means of an optical scanning droplet cell and in situ detection of oxygen using scanning photoelectrochemical microscopy are presented.