Experimental determination of the Onsager coefficients of transport for Ce0.8Pr0.2O2−δ

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出版日 2010-06-24

DOI 10.1039/C000865F

インパクトファクター 3.676

著者

Woo-Seok Park, Hong-Seok Kim, Peter Vang Hendriksen, Han-Ill Yoo

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要旨

For a mixed oxide-ion and electron conducting oxide, with oxygen vacancies and electrons (e′) or holes (h˙) as charge carriers, a flux of (Ji) can in principle be driven, not only directly by its own electrochemical potential gradient (∇ηi), but also indirectly by that of electrons (∇ηe), and vice versa for the flux of electrons (Je). It is common practice to assume that electrons and mobile ions migrate independently, despite the lack of experimental evidence in support of this. Here, all the Onsager coefficients, including the cross coefficients, have been measured for Ce0.8Pr0.2O2−δ within the aO2 range 10−21–1 at 800 °C, using local ionic and electronic probes in a four-probe configuration. The cross coefficients of transport were found to be negligible in comparison to the direct coefficients in the aO2 range 10−21–10−4, but of the same order of magnitude as the direct coefficients for high aO2 values (10−2–1). This is in contrast to the commonly used assumption that the two types of carriers migrate independently, i.e. that Lie = 0.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 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.

Experimental determination of the Onsager coefficients of transport for Ce0.8Pr0.2O2−δ

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