Tuning Light-Driven Water Splitting Efficiency of Mo-Doped BiVO4: Optimised Preparation and Impact of Oxygen Evolution Electrocatalysts

Junqueira, J.R.C. and Bobrowski, T. and Krysiak, O.A. and Gutkowski, R. and Schuhmann, W.

Volume: 11 Pages: 6417-6424
DOI: 10.1002/cctc.201901646
Published: 2019

We present airbrush spray-coating as a reproducible method for the preparation of Mo-doped BiVO4 (Mo : BiVO4) 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 : BiVO4 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 : BiVO4 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 : BiVO4 sample in absence of any OER electrocatalyst. © 2019 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

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