Bubble Consumption Dynamics in Electrochemical Oxygen Reduction

doi:10.1007/s40242-020-0061-y

Chemical Research in Chinese Universities ›› 2020, Vol. 36 ›› Issue (3): 473-478.doi: 10.1007/s40242-020-0061-y

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Bubble Consumption Dynamics in Electrochemical Oxygen Reduction

CHEN Fanhong¹, ZHOU Daojin¹, LU Zhiyi², WANG Cheng³, LUO Liang¹, LIU Yiwei¹, SHANG Zhicheng¹, SHENG Siyu¹, CHENG Congtian¹, XU Haijun¹, SUN Xiaoming¹

1. State Key Laboratory of Chemical Resource Engineering, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China;
2. Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, P. R. China;
3. Chinese Research Academy of Environmental Sciences, Beijing 100012, P. R. China

Received:2020-03-12 Revised:2020-04-22 Online:2020-06-01 Published:2020-05-30
Contact: XU Haijun, SUN Xiaoming E-mail:sunxm@mail.buct.edu.cn;hjxu@mail.buct.edu.cn;luoliang@mail.buct.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.21675007, 21676015, 21520102002, 91622116), the National Key Research and Development Project of China(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.

Abstract

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 aerophilic 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 consumption 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.

Key words: Gas consumption, Electrochemical reaction, Interface study, Aerophobic, Aerophilic

CHEN Fanhong, ZHOU Daojin, LU Zhiyi, WANG Cheng, LUO Liang, LIU Yiwei, SHANG Zhicheng, SHENG Siyu, CHENG Congtian, XU Haijun, SUN Xiaoming. Bubble Consumption Dynamics in Electrochemical Oxygen Reduction[J]. Chemical Research in Chinese Universities, 2020, 36(3): 473-478.

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