Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.085
Publication date: 18th July 2019
Photoelectrochemical water splitting presents a viable means of sustainable fuel generation, but the limiting kinetics of the four-hole water oxidation reaction presents a bottleneck. While significant progress has been made to enhance the performance of transition metal oxide photoanodes through improved synthetic measures and nanostructuring, overall STH efficiencies remain low. The development of electrocatalysts, which may be used in conjunction with a photovoltaic device (PV + electrolysis) or integrated with a photoanode material, is thus an active area of research. NiOx based materials have received a lot of attention recently as efficient, stable water oxidation electrocatalysts. In this presentation, I will discuss our on-going research into a mechanistic understanding of NiOx electrocatalysts. In particular, I will focus on the role of Fe-dopants in these systems, and examine samples of different thicknesses to determine where the oxidised species accumulate in such films. We employ electrochemical impedance spectroscopy, spectroelectrochemistry and transient optical techniques to monitor the oxidative steps involved in the reaction cycle. With these insights, we aim to identify the cause of the high performance seen in these materials and the limiting factors which may be addressed to further improve performance.
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