Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.086
Publication date: 18th July 2019
The photoelectrocatalytic performance (i.e. water oxidation) of semiconducting materials as photoanodes is continually optimised through the implementation of nanostructuring and catalyst overlayers. Yet, the exact origin of this photoelectrocatalytic enhancement can often remain elusive. In this work we present direct spectroscopic evidence that the enhanced performance of FeOOHNiOOH coated BiVO4 results from irreversible hole transfer to the catalyst layer and consecutive hole transfer to the electrolyte to oxidise water. This hole transfer spatially separates the photogenerated charge, thus slowing down recombination. Moreover, despite not directly enhancing the kinetics of the catalytic process, we have demonstrated using steady state spectroscopic measurements that holes accumulated on the catalyst layer are responsible for oxygen generation. Additionally, charge tranport is a crucial factor that needs to be considered when optimsing electrodes for catalysis. Our thermal studies shed light on the importance of oxygen vacancies on electron transport processes that govern the overall photoelectrocatalytic performance of metal-oxide based photoanodes for water oxidation.
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