A Combinatorial Approach for Optimization of Oxygen Evolution Catalyst Loading on Mo-doped BiVO4 Photoanodes

Gutkowski, R. and Masa, J. and Schuhmann, W.

Volume: 31 Pages: 1517-1523
DOI: 10.1002/elan.201900147
Published: 2019

The incident photon to current efficiency (IPCE) of a photoactive surface strongly depends on the loading and thickness of the active materials. We present a combinatorial approach based on an optical scanning droplet cell for simultaneous deposition and systematic characterization of co-catalysts for the oxygen evolution reaction (OER) on Mo-doped BiVO4 (Mo−BiVO4) photoanodes electrochemically pre-deposited on transparent conductive FTO substrates. The loading and photoelectrochemical characterization of 10 different OER co-catalysts deposited by three different deposition techniques on FTO-supported Mo−BiVO4 were investigated aiming at determination of the suitable deposition parameters affording the highest enhancement of photoelectrochemical oxygen evolution for the different OER/Mo−BiVO4 films. A comparison of the photoelectrochemical performance of films of various OER co-catalyst deposited on FTO-supported Mo−BiVO4 by electrodeposition, photo-assisted electrodeposition and photodeposition revealed the necessity of a material specific optimization with respect to co-catalyst loading and deposition technique to achieve optimal IPCE for each co-catalysts. © 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

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