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Concurrent oxygen evolution reaction pathways revealed by high-speed compressive Raman imaging

Chemistry

Concurrent oxygen evolution reaction pathways revealed by high-speed compressive Raman imaging

R. Pandya, F. Dorchies, et al.

This cutting-edge research, conducted by Raj Pandya and colleagues, employs high-speed compressive Raman imaging to delve into the intricate mechanisms of the oxygen evolution reaction in α-Li₂IrO₃. The findings reveal fascinating bias-dependent pathways for the reaction—insights that could transform our understanding of charge compensation in crystalline catalysts.

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Playback language: English
Abstract
This paper utilizes high-speed compressive Raman imaging to investigate the oxygen evolution reaction (OER) in α-Li₂IrO₃, a crystalline electrocatalyst. The study reveals bias-dependent OER pathways, showing that at low overpotentials, the reaction is compensated by bulk ion exchange, while at high overpotentials, charge compensation occurs via surface redox sites. This demonstrates that charge compensation can extend beyond the surface in crystalline catalysts. The compressive Raman imaging technique is highlighted as a powerful tool for tracking microscale reaction dynamics in various materials.
Publisher
Nature Communications
Published On
Sep 27, 2024
Authors
Raj Pandya, Florian Dorchies, Davide Romanin, Jean-François Lemineur, Frédéric Kanoufi, Sylvain Gigan, Alex W. Chin, Hilton B. de Aguiar, Alexis Grimaud
Tags
oxygen evolution reaction
α-Li₂IrO₃
compressive Raman imaging
charge compensation
bulk ion exchange
surface redox sites
microscale reaction dynamics
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