Publication date: 15th December 2025
Earth-abundant transition metal oxides (TMOs) based on Ni, Fe and Co are being widely explored as potential electrocatalysts. [1,2] Their low production costs and high availability make them promising candidates for applications in energy and chemical product generation. [3] However, achieving the high catalytic efficiencies and stabilities required for industrial implementation remains challenging. [4] Electrochemical reactions, driven by an external electric field, occur as a series of proton - coupled electron transfer steps in which reaction intermediates are generated. [5] However, the exact mechanism behind the generation and stabilisation of those intermediates in TMOs is not well understood. [6] In this poster, I will discuss how ultrafast spectroscopy can be used as a tool to monitor and control the formation of reaction intermediates at the electrochemical interface. Specifically, I will report data on Ni-based oxides used for the oxygen evolution reaction (OER), tracking the spectroscopic fingerprints of different intermediates and demonstrating how they can be manipulated using light. Finally, I will examine the opportunities and constraints associated with light-driven control of pre-catalytic species and the reaction mechanism.
This work was supported by the European Research Council (ERC) and the Agence Nationale de la Recherche (ANR).
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