Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.201
Publication date: 18th July 2019
Metal oxides comprise an interesting class of photoanode materials for photoelectrochemical (PEC) water oxidation; a key reaction for the realization of solar fuels. Under PEC water oxidation conditions, many metal oxides have been shown to accumulate holes in surface states which can recombine with conduction band electrons and thus limit the performance. This surface state recombination can be mitigated through introduction of electrocatalysts on the metal oxide semiconductor surface which often leads to improved performance. We have found that some semiconductor/catalyst combinations result in similar or worse performance compared to the bare electrode, however. We will present recent results of copper tungstate (CuWO4) photoanodes coupled with electrocatalysts which deepen the understanding of the energetics and electron-transfer processes at semiconductor/electrocatalyst interfaces that control the performance of such systems. Through rigorous comparison of cyclic voltammetry, current transient and electrochemical impedance spectroscopy (EIS), intensity modulated photocurrent spectroscopy (IMPS), and dual-working electrode experiments measurements, we have been able to gain a significant insight into the role of the catalyst and the electron-transfer at the interface on the performance of PEC water oxidation. General lessons and design rules for efficient PEC water splitting will finally be discussed.
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