Currently, nickel-based solid oxide fuel cell (SOFC) anode materials do not support the use of complex hydrocarbon fuels (high molecular weight, with H2S contaminants) that can lead to eventual device failure brought upon by unwanted graphitic and metal sulfide formations. These limitations have spurred the investigation of new mixed ionic and electronic conducting (MIEC) anode materials that are effective at blocking these detrimental formations. The MIEC anode material used in this study was the double perovskite, Sr2MgMoO6 (SMMO). The redox chemistry of this material was explored using X-ray absorption spectroscopy (XAS) in conjunction with a unique, custom built electrochemical assembly to allow for the non-invasive exploration of these materials during device operation at 800�C. This work was completed at the 10-ID Beamline located at the Advance Photon Source at Argonne National Laboratory. Data exhibited that the XAS spectra for the molybdenum K-edge of this material showed drastic changes for the reduced and oxidized samples as evident by a shift in the molybdenum 1s electron binding energy and an increase in the formation of oxide vacancies when the sample was exposed to a reducing atmosphere. In situ electrochemical measurements, taken at 800�C of a working single chamber SOFC revealed that the molybdenum oxidation state in SMMO remained unchanged under various cell polarizations. The findings, of this study, demonstrated that SMMO would be an acceptable SOFC anode material by providing adequate electron conduction through multivalent molybdenum oxidation states, the formation of oxide vacancies to offer acceptable sulfur and carbon tolerance, and its stability under various cell potentials.

High temperature, in situ X-ray absorption spectroscopy study of Sr<sub>2</sub>MgMoO<sub>6</sub> solid oxide fuel cell anode materials

247th National Meeting (2014)

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High temperature, in situ X-ray absorption spectroscopy study of Sr2MgMoO6 solid oxide fuel cell anode materials

High temperature, in situ X-ray absorption spectroscopy study of Sr₂MgMoO₆ solid oxide fuel cell anode materials