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

Literature Information

Publication Date 2013-01-21
DOI 10.1039/C3CP44225J
Impact Factor 3.676
Authors

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


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Abstract

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.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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