Hydrogen oxidation at the Pt–BaZr0.1Ce0.7Y0.1Yb0.1O3−δ (BZCYYb) interface

文献情報

出版日 2013-01-21

DOI 10.1039/C3CP44225J

インパクトファクター 3.676

著者

Mingfei Liu, Shi Feng, Wei Liu, Hyeon Cheol Park, Meilin Liu

原文を見る

要旨

An asymmetric cell based on a proton conductor, BaZr0.1Ce0.7Y0.1Yb0.1O3−δ (BZCYYb), with a well-defined patterned Pt electrode was prepared to study the kinetics and mechanism of the hydrogen oxidation reaction under typical conditions for fuel cell operation and hydrogen separation, including operating temperature and hydrogen partial pressure. Steady-state polarization curves were carefully analyzed to determine the apparent exchange current density, limiting current density, and charge transfer coefficients. The empirical reaction order, as estimated from the dependence of electrode polarization (Rp) and exchange current density on the partial pressure of hydrogen (PH2), varied from 0.55 to 0.71. The results indicate that hydrogen dissociation contributes the most to the rate-limiting step of the hydrogen oxidation reaction taking place at the Pt–BZCYYb interface. At high current densities, surface diffusion of electroactive species appears to contribute to the rate-limiting step as well.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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