Adsorbed oxygen dynamics at forced convection interface in the oxygen evolution reaction

Zhixuan Chen, Ze Lin, Xiaoyu Zhu, Yahui Li and Ying Wang ()
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Zhixuan Chen: Tongji University
Ze Lin: Tongji University
Xiaoyu Zhu: Tongji University
Yahui Li: Tongji University
Ying Wang: Tongji University

Nature Communications, 2025, vol. 16, issue 1, 1-12

Abstract: Abstract The oxygen evolution reaction is a prevalent anodic reaction in electrocatalytic processes. Modulation of adsorbed oxygen (*O) at the electrochemical interface is an effective means to reduce the overpotential of the oxygen evolution reaction. However, the contribution of various *O conversions to the overpotential remains unclear. Herein, the development of a multi-component forced convection electrochemical mass spectrometry constructs *O-labeled electrochemical interfaces with specific coverages to track the *O conversions. The relationships between the Faradic contributions and the specific *O conversion pathways are established by considering the anomalous fractionation of molecule oxygen. Our experiments confirm that *O coupling contributes up to 48% with a specific overpotential on full coverage platinum. Distinguishing the *O conversion contributions with various coverages reveals that balancing the *O formation and conversions, especially *O coupling enables further minimization of the overpotential of the oxygen evolution reaction. Thus, tracking the intermediate conversions has implications for designing high-performance electrocatalytic interfaces.

Date: 2025
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DOI: 10.1038/s41467-025-63181-z

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