Abstract
Electrochemical oxygen reduction reaction(ORR) is crucial for fuel cells and metal-air batteries, while the oxygen consumption dynamics study during ORR, which affects the ORR efficiency, is not as concerned as catalysts design does. Herein the consumption behavior of an individual oxygen bubble on Pt foils with different wettabilities during ORR was tracked by a real-time approach to reveal whether the surface wettability of electrode can influence the consumption dynamics and determine the reaction reactive zones of oxygen bubble consumption. The oxygen bubble underwent a “constant contact angle” dominant consumption model on aerophobic Pt foil, while an initial “constant radius” and the subsequent “constant contact angle” oxygen consumption models were observed on aero-philic Pt foil. Results here demonstrated that the current was proportional to the bottom contact area, rather than the three-phase contact line of the bubbles according to the fitting curves between individual bubble current and the con-sumption behavior parameters. This study highlights the important role of the gas-solid interface in influencing the efficiency of gas consumption electrochemical reactions, which shall benefit the understanding of reaction kinetics and the rational design of electrocatalysts.
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Acknowledgments
We are grateful to Prof. LIN Wen-Feng from Loughborough University and Prof. ZHUANG Lin from WuHan University for their help and advice in experiments.
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Supported by the National Natural Science Foundation of China(Nos.21675007, 21676015, 21520102002, 91622116), the National Key Research and Development Project(Nos.2018YFB1502401, 2018YFA0702002), the Royal Society and the Newton Fund Through the Newton Advanced Fellowship Award(No.NAF/R1/191294), the Program for Changjiang Scholars and Innovation Research Team in the University, China(No.IRT1205), the Fundamental Research Funds for the Central Universities of CHina, and the Long-term Subsidy Mechanism from the Ministry of Finance and the Ministry of Education of China.
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Chen, F., Zhou, D., Lu, Z. et al. Bubble Consumption Dynamics in Electrochemical Oxygen Reduction. Chem. Res. Chin. Univ. 36, 473–478 (2020). https://doi.org/10.1007/s40242-020-0061-y
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DOI: https://doi.org/10.1007/s40242-020-0061-y