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Tuning Light‐Driven Water Splitting Efficiency of Mo‐Doped BiVO 4 : Optimised Preparation and Impact of Oxygen Evolution Electrocatalysts
Author(s) -
Junqueira João R. C.,
Bobrowski Tim,
Krysiak Olga A.,
Gutkowski Ramona,
Schuhmann Wolfgang
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201901646
Subject(s) - photocurrent , oxygen evolution , electrocatalyst , materials science , catalysis , water splitting , chemical engineering , doping , nanotechnology , chemistry , optoelectronics , electrochemistry , electrode , photocatalysis , biochemistry , engineering
We present airbrush spray‐coating as a reproducible method for the preparation of Mo‐doped BiVO 4 (Mo : BiVO 4 ) as photoabsorber with different layer thicknesses and Mo content. Optimisation of layer thickness is aiming on diminishing limitations by the electronic conductivity within the photoabsorber, thus increasing the incident photon to current efficiency (IPCE) of the samples. Furthermore, the Mo to V ratio leading to the highest photocurrent density was determined, and the optimised Mo : BiVO 4 samples were decorated with a variety of oxygen evolution reaction (OER) electrocatalysts such as cobalt phosphate and layered double hydroxides. A mass loading gradient of Ni−Fe LDH was sprayed on top of the Mo : BiVO 4 photoanode for optimisation of the OER catalyst loading. The photocurrent density was enhanced by up to 5.8 times at 0.8 V vs . RHE in comparison with the pristine Mo : BiVO 4 sample in absence of any OER electrocatalyst.