Understanding the Oxygen Evolution Reaction Mechanism Through the Lens of Scanning Electrochemical Microscopy.

Authors

Smruti Purohit, Aravind Kumar Chandiran

Published in

Small (Weinheim an der Bergstrasse, Germany). Pages e00002. Jun 29, 2026. Epub Jun 29, 2026.

Abstract

Scanning electrochemical microscopy (SECM) is an efficient operando technique that offers deep insight into the electrode-electrolyte interfacial process occurring during electrochemical reactions. This approach helps to identify the complexities of the reactions associated with the electrochemical steps and intermediates in various reaction conditions. This article focuses on employing SECM as a tool to study anodic oxygen evolution reaction (OER) in water splitting. Using this technique, the qualitative and quantitative evaluation of catalytic activity can be mapped on catalyst surface. This work critically investigates SECM's strengths in probing key catalytic parameters involved in OER, such as charge transfer kinetics, oxygen flux evaluation, and catalyst-substrate interactions. In addition to that, SECM's ability to detect reactive oxygen species, active site analysis, and determination of catalyst oxidation state are also emphasized, using various operational modes. Finally, the challenges of SECM are highlighted elaborately, which can pave the path for further innovation in related fields.

PMID:
42367056
Bibliographic data and abstract were imported from PubMed on 29 Jun 2026.

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