A molecular-level description of the oxygen evolution reaction using in situ spectroscopy

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• Rosa Arrigo, Uni of Salford
• Thursday 02 May 2024, 11:30-12:30
• Open Plan Area, Institute for Energy and Environmental Flows, Madingley Rise CB3 0EZ.

If you have a question about this talk, please contact Catherine Pearson.

Water electrolysis stands as a cornerstone technology for green hydrogen production from renewable energy and consists of two half-cell reactions: the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). The sluggish kinetics of the state-of-the-art OER electrocatalysts based on iridium oxide severely limit the overall efficiency of the process and, consequently, its economic viability. An in-depth comprehension of the atomic-level mechanisms governing this reaction is considered essential for designing enhanced materials and advancing the transition to a sustainable and resilient energy sector. In situ structural characterization techniques, such as X-ray absorption spectroscopy and X-ray photoelectron spectroscopy, serve this purpose well as they enable real-time monitoring of the chemical composition, structural phase, and electronic configuration of the species at the gas/liquid/solid interface during the interfacial electrocatalytic turnover. In this talk, I will present an overview of the experimental approaches developed in our group and by others to probe the reactive interface during OER , as well as our current understanding of the reaction mechanism on Ir-O-based systems gained using both soft and hard X-ray spectroscopic techniques.

References

1) R Arrigo, M H ävecker, ME Schuster, C Ranjan, E Stotz, A Knop-Gericke et al.,

In situ study of the gas-phase electrolysis of water on platinum by NAP -XPS,

Angewandte Chemie International Edition 52 (2013), 11660-11664

2) JJ Velasco‐Velez, V Pfeifer, M H ävecker, RS Weatherup, R Arrigo et al., Photoelectron spectroscopy at the graphene–liquid interface reveals the electronic structure of an electrodeposited cobalt/graphene electrocatalyst, Angewandte Chemie International Edition 54 (2015), 14554-14558

3) A Knop-Gericke, V Pfeifer, JJ Velasco-Velez, T Jones, R Arrigo et al., In situ X-ray photoelectron spectroscopy of electrochemically active solid-gas and solid-liquid interfaces, Journal of Electron Spectroscopy and Related Phenomena 221 (2017), 10-17

4) V Pfeifer, TE Jones, JJV V élez, R Arrigo, S Piccinin, M H ävecker et al., In situ observation of reactive oxygen species forming on oxygen-evolving iridium surfaces, Chemical science 8 (2017), 2143-2149 5) V Pfeifer, TE Jones, S Wrabetz, C Massué, JJV V élez, R Arrigo et al., Reactive oxygen species in iridium-based OER catalysts, Chemical science 7 (2017), 6791-6795

6) JJ Velasco-Vélez, EA Carbonio, CH Chuang, CJ Hsu, JF Lee, R Arrigo, et al., Surface electron-hole rich species active in the electrocatalytic water oxidation, Journal of the American Chemical Society 143 (2021), 12524-12534

7) JJV V élez, D Bernsmeier, TE Jones, P Zeller, E Carbonio, CH Chuang, et al., The rise of electrochemical NAPXPS operated in the soft X-ray regime exemplified by the oxygen evolution reaction on IrO x electrocatalysts, Faraday discussions 236 (2022), 103-125 8) J Ruiz Esquius, DJ Morgan, G Algara Siller, D Gianolio, M Aramini et al., Lithium-directed transformation of amorphous iridium (oxy) hydroxides to produce active water oxidation catalysts, Journal of the American Chemical Society 145 (2023), 6398-6409 9) M Falsaperna, R Arrigo, F Marken, SJ Freakley Alkali Containing Layered Metal Oxides as Catalysts for the Oxygen Evolution Reaction, ChemElectroChem 2024, e202300761

This talk is part of the Institute for Energy and Environmental Flows (IEEF) series.

This talk is included in these lists:

• All Talks (aka the CURE list)
• Cambridge Energy Seminars
• Department of Earth Sciences seminars
• Institute for Energy and Environmental Flows (IEEF)
• NanoDTC Energy Materials Talks
• Open Plan Area, Institute for Energy and Environmental Flows, Madingley Rise CB3 0EZ
• history
• ps635

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