Proton conductivity in mixed-conducting BSFZ perovskite from thermogravimetric relaxation

文献信息

发布日期 2014-06-16
DOI 10.1039/C4CP00459K
影响因子 3.676
作者

Daniel Poetzsch, Rotraut Merkle, Joachim Maier


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摘要

The proton conductivity of mixed hole-, oxygen ion- and proton-conducting Ba0.5Sr0.5Fe0.8Zn0.2O3−δ (BSFZ), a potential cathode material for fuel cells based on oxidic proton-conducting electrolytes, was determined from the weight changes of dense pellets upon changing pH2O (and pD2O). The obtained proton concentrations at 20 mbar pH2O range from 1.3 to 0.32 mol% (350–600 °C). The effective diffusion coefficients extracted from the transients and ranging from 1.4 to 29 × 10−7 cm2 s−1 (350 to 600 °C) represent a lower bound for the proton diffusivity and the directly related proton mobility. The calculated proton conductivities reach values in the range of 0.9 to 3 × 10−4 S cm−1. Since the real proton conductivity might be underestimated, these values are sufficiently high to render the bulk path in the oxygen reduction mechanism dominant in dense, thin-film electrodes.

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来源期刊

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
自引率: 10.3%
年发文量: 3036

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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