An Investigation of the Electrochemical Activity of (Ba/Sr)FeO 3-y Anodes

Paige, Julian M.; Ma, Liang; Chigbu, Ceydrick; Liu, Xingbo; Gorte, Raymond J.; Vohs, John M.

doi:10.1149/1945-7111/ac5d93

An Investigation of the Electrochemical Activity of (Ba/Sr)FeO _3-y Anodes

Journal Article · 01 March 2022 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1945-7111/ac5d93· OSTI ID:1980872

^[1]; Ma, Liang; Chigbu, Ceydrick; ; ; Vohs, John M.

OSTI

FeO_x, SrFeO_3-y(SF), and Ba_0.5Sr_0.5FeO_3–y(BSF) were studied for application as fuel oxidation catalysts in solid oxide fuel cells (SOFC) anodes. Electrodes were prepared by impregnation into porous yttria-stabilized zirconia (YSZ), with La_0.3Sr_0.7TiO_3–y(LST) added for electronic conductivity. The electrode impedances decreased dramatically upon addition of SF and BSF and much less when only SrO or FeO_xwere added. Temperature Programmed Desorption (TPD) of O₂from oxidized BSF showed O₂desorbing between 200 °C and 700 °C, while no O₂desorbed from Fe₂O₃below 900 °C. The results, together with thermodynamic analysis, suggest that stabilization of Fe⁺⁴in the perovskite lattice plays an important role in enhancing the catalytic activity of SF and BSF by providing access to a Fe³⁺/Fe⁴⁺redox couple that can accept oxygen anions from the yttria-stabilized zirconia (YSZ) electrolyte. Oxygen is weakly bound to these sites facilitating its reaction with adsorbed H₂.

Research Organization:: Univ. of Pennsylvania, Philadelphia, PA (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

DOE Contract Number:: FE0031673

OSTI ID:: 1980872

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 3 Vol. 169; ISSN 0013-4651

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

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