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High‐Temperature, In Situ X‐ray Absorption Study of Sr 2 MgMoO 6 Solid‐Oxide Fuel‐Cell Anode Materials
Author(s) -
Eigenbrodt Bryan C.,
Young Anthony M.,
Howell Thomas G.,
Segre Carlo U.,
Reitz Thomas L.
Publication year - 2015
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500122
Subject(s) - anode , oxide , ionic bonding , materials science , xanes , absorption spectroscopy , absorption (acoustics) , solid oxide fuel cell , spectroscopy , chemical engineering , analytical chemistry (journal) , inorganic chemistry , chemistry , ion , electrode , composite material , metallurgy , optics , organic chemistry , physics , quantum mechanics , chromatography , engineering
Limitations of current solid oxide fuel cell anode materials have spurred the exploration of alternative materials. Mixed ionic and electronic conducting anode materials have the potential to overcome these limitations. The mixed ionic and electronic conducting material explored in this work is Sr 2 MgMoO 6 (SMMO). X‐ray absorption spectroscopy in conjunction with an in situ assembly was used to study the fundamental redox chemistry of SMMO at 800 °C. The X‐ray absorption spectra for the Mo K‐edge exhibited changes in the reduced and oxidized bulk SMMO samples, as evident in a shift in the Mo binding energies and in the formation of oxide vacancies. However, in situ measurements of the working devices revealed that the Mo oxidation state remained unchanged under various cell polarizations. These findings demonstrate that SMMO, as a solid oxide fuel cell anode, has the potential to provide adequate electron conduction through multivalent Mo sites and to provide fuel tolerance through oxide vacancies built into its crystal structure.