Corresponding Author

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


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


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

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