Tuning Light‐Driven Water Oxidation Efficiency of Molybdenum‐Doped BiVO 4 by Means of Multicomposite Catalysts Containing Nickel, Iron, and Chromium Oxides

Autor:	Felipe Conzuelo, Olga A. Krysiak, João R. C. Junqueira, Andrzej Wysmołek, Patrick Wilde, Wolfgang Schuhmann, Tim Bobrowski
Rok vydání:	2020
Předmět:	Materials science 010405 organic chemistry Oxygen evolution chemistry.chemical_element General Chemistry 010402 general chemistry 01 natural sciences Oxygen 0104 chemical sciences Catalysis Chromium chemistry.chemical_compound Nickel chemistry Chemical engineering Molybdenum Bismuth vanadate Water splitting
Zdroj:	ChemPlusChem. 85:327-333
ISSN:	2192-6506
DOI:	10.1002/cplu.201900701
Popis:	Mo-doped BiVO4 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:BiVO4 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:BiVO4 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.
Databáze:	OpenAIRE
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