In Situ Structural and Electrical Conductivity Characterization of Sr2MMoO6-δ Double Perovskite Solid Oxide Fuel Cell Anode Materials

Witt, Suzanne E.; Allen, Andrew J.; Kuzmenko, Ivan; Holtz, Megan E.; Young, Sandra

doi:10.1021/acsaem.0c00376

Title: In Situ Structural and Electrical Conductivity Characterization of Sr2MMoO6-δ Double Perovskite Solid Oxide Fuel Cell Anode Materials

Journal Article · Thu May 21 00:00:00 EDT 2020 · ACS Applied Energy Materials

DOI:https://doi.org/10.1021/acsaem.0c00376· OSTI ID:1660388

^[1]; Allen, Andrew J. ^[1]; Kuzmenko, Ivan ^[2]; Holtz, Megan E. ^[1]; Young, Sandra ^[1]

National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Material Measurement Lab.
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

In this study, a series of Sr₂MMoO_6-δ double perovskite solid oxide fuel cell (SOFC) anode materials (where 0 <= δ <= 0.041 and M = Fe, Co, or Ni) were synthesized, and the changes in their morphologies under relevant SOFC operating conditions were explored. Ultra-small-angle X-ray scattering (USAXS), small-angle X-ray scattering (SAXS), and wide-angle X-ray scattering (WAXS) were used to determine changes in the microstructures and phase compositions of the anode materials at high temperatures and under a reducing atmosphere. The stability of the double perovskite structure was found to be highly dependent on the identity of the cation M, such that when M = Fe, the material remained stable over the course of the experiments. However, when M = Co or Ni, significant changes in the microstructure and phase composition were observed. An in situ study of the M = Co sample, in which electrical conductivity and USAXS/SAXS/WAXS measurements were conducted simultaneously, revealed the structural degradation mechanisms and electrical conductivity changes over a range of temperatures. To conduct these measurements, a cell was developed that allowed for a sample mounted on Pt wires to be placed in the X-ray beam and heated under gas flow comprising 4% mass H₂ and 96% mass N₂. The resulting measurements allowed for the direct comparison of the electrical and morphological changes occurring in the material under operating conditions, such that increases in conductivity could be attributed to the growth of new phases.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Institute of Standards and Technology (NIST); USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1660388

Journal Information:: ACS Applied Energy Materials, Vol. 3, Issue 6; ISSN 2574-0962

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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