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Published on: October 3, 2018
Adsorbed oxygen dynamics at forced convection interface in the oxygen evolution reaction
Zhixuan Chen1, Ze Lin1, Xiaoyu Zhu1
1State Key Laboratory of Water Pollution Control and Green Resource Recycling, Shanghai Institute of Pollution Control and Ecological Security, College of Environmental Science and Engineering, Tongji University, Shanghai, China.
None:
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.
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