The Study of Dynamical Electrochemical Impedance Spectroscopy for Oxygen Reduction Reaction on Pt/C Catalyst

Authors

Kun-ming SHI, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003,Shandong, China;Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
Jian-wei GUO, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;Follow
Jia WANG, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003,Shandong, China;

Corresponding Author

Jian-wei GUO(jwguo@mail.tsinghua.edu.cn)

Abstract

With joint techniques of rotating disc electrode(RDE) and electrochemical impedance spectroscopy(EIS), and further establishment on equivalent circuit model, this paper studied oxygen reduction reaction(ORR) on commercial Pt/C catalyst in acid medium. Our results found that the dynamical interface on Pt/C consists of two independent processes: 1) the PtO reduction from Pt surface, 2) the new PtO formation from ORR, thus providing key clues for catalyst stability and activity. This also implied that the dynamical interface facilitates reconstruction for porous electrode, and matches with mass transfer. One important issue is discovered that at high overpotential, the high reaction rate for ORR can be further improved if providing hydrophobicity on catalyst surface. All these efforts on ORR progress not only compensate for DC electrochemistry study, but also provide basis for future model establishment.

Graphical Abstract

Keywords

fuel cells, Pt/C catalyst, oxygen reduction reaction, rotating disk electrode, electrochemical impedance spectroscopy

DOI Link

https://doi.org/10.13208/j.electrochem.160310

Publication Date

2016-10-28

Online Available Date

2016-04-27

Revised Date

2016-04-10

Received Date

2016-03-10

Recommended Citation

Kun-ming SHI, Jian-wei GUO, Jia WANG. The Study of Dynamical Electrochemical Impedance Spectroscopy for Oxygen Reduction Reaction on Pt/C Catalyst[J]. Journal of Electrochemistry, 2016 , 22(5): 542-548.
DOI: 10.13208/j.electrochem.160310
Available at: https://jelectrochem.xmu.edu.cn/journal/vol22/iss5/12