Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.101
Publication date: 18th July 2023
Investigating the water oxidation mechanism using operando spectroelectrochemistry
Efficient (photo)electrochemical oxidation of water is central to the production of energy carriers such as hydrogen. Hydrogen plays a critical role in the energy transformation to a sustainable future, due to its widespread applications as a fuel for transport, feedstock to chemical industries and a heat source for buildings and industry. Low temperature water electrolysis can enable hydrogen production renewably and at scale; however, the efficiencies of these technologies are currently limited by poor kinetics of the water oxidation reaction at the anode.
State-of-the-art catalysts such as iridium-based oxides in acidic electrolyte and nickel oxyhydroxides in alkaline electrolyte exhibit complex redox chemistry, which cannot be understood using electrochemical measurements alone. Particularly, the redox transitions on these catalysts can exhibit non-Nernstian behaviour, resulting in the redox transitions being dependent on pH. In this talk, I will demonstrate how optical spectroscopy and X-ray absorption spectroscopy can be used to identify and quantify the density of potential-dependent intermediates, the interaction between them, and the intrinsic rate of water oxidation, as a function of pH. In addition to determining the changes in the catalyst, I will also show how the nature of interfacial water can be probed using surface enhanced infrared absorption spectroscopy. Therefore, using a combination of operando spectroscopic techniques, I will elucidate the factors controlling water oxidation kinetics on these materials.
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