Synchrotron X-ray studies of model SOFC cathodes, part II: Porous powder cathodes

Chang, Kee-Chul; Ingram, Brian; Ilavsky, Jan; Lee, Shiwoo; Fuoss, Paul; You, Hoydoo

doi:10.1016/j.ssi.2017.10.001

Synchrotron X-ray studies of model SOFC cathodes, part II: Porous powder cathodes

Journal Article · Sat Oct 28 00:00:00 EDT 2017 · Solid State Ionics

DOI:https://doi.org/10.1016/j.ssi.2017.10.001· OSTI ID:1411042

Chang, Kee-Chul ^[1]; ^[2]; Ilavsky, Jan ^[3]; Lee, Shiwoo ^[4]; Fuoss, Paul ^[1]; You, Hoydoo ^[1]

Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
National Energy Technology Lab. (NETL), Morgantown, WV (United States); AECOM, Morgantown, WV (United States)

Infiltrated La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ (LSCF) sintered porous powder cathodes for solid oxide fuel cells have been investigated by synchrotron ultra-small angle x-ray scattering (USAXS). Here, we demonstrated that atomic layer deposition (ALD) is the method for a uniform coating and liquid-phase infiltration for growing nanoscale particles on the porous LSCF surfaces. The MnO infiltrate, grown by ALD, forms a conformal layer with a uniform thickness throughout the pores evidenced by USAXS thickness fringes. The La_0.6Sr_0.4CoO₃ (LSC) and La₂Zr₂O₇ (LZO) infiltrates, grown by liquid-phase infiltration, were found to form nanoscale particles on the surfaces of LSCF particles resulting in increased surface areas. In conclusion, impedance measurements suggest that the catalytic property of LSC infiltrate, not the increased surface area of LZO, is important for increasing oxygen reduction activities.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1411042

Alternate ID(s):: OSTI ID: 1607587

Journal Information:: Solid State Ionics, Journal Name: Solid State Ionics Journal Issue: C Vol. 311; ISSN 0167-2738

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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