The Electrochemical Properties of Sr(Ti,Fe)O 3-δ for Anodes in Solid Oxide Fuel Cells

Nenning, Andreas; Volgger, Lukas; Miller, Elizabeth; Mogni, Liliana V.; Barnett, Scott; Fleig, Jürgen

doi:10.1149/2.1271704jes

Title: The Electrochemical Properties of Sr(Ti,Fe)O _3-δ for Anodes in Solid Oxide Fuel Cells

Journal Article · Sat Feb 18 00:00:00 EST 2017 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/2.1271704jes· OSTI ID:1426161

Nenning, Andreas ^[1]; Volgger, Lukas ^[2]; Miller, Elizabeth ^[3];

^[4]; Barnett, Scott ^[3]; Fleig, Jürgen ^[2]

Federal Inst. of Technology, Zurich (Switzerland). Dept. of Materials
Vienna Univ. of Technology (Austria). Inst. of Chemical Technologies and Analytics
Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
Comision Nacional de Energia Atomica (CNEA), San Carlos de Bariloche (Argentina). Centro Atomico Bariloche (CAB), Dept. Caracterizacion de Materiales

Reduction-stable mixed ionic and electronic conductors such as Sr(Ti,Fe)O_3-δ (STF) are promising materials for application in anodes of solid oxide fuel cells. The defect chemistry of STF and its properties as solid oxide fuel cell (SOFC) cathode have been studied thoroughly, while mechanistic investigations of its electrochemical properties as SOFC anode material are still scarce. In this study, thin film model electrodes of STF with 30% and 70% Fe content were investigated in H₂+H₂O atmosphere by electrochemical impedance spectroscopy. Lithographically patterned thin film Pt current collectors were applied on top or beneath the STF thin films to compensate for the low electronic conductivity under reducing conditions. Oxygen exchange resistances, electronic and ionic conductivities and chemical capacitances were quantified and discussed in a defect chemical model. Increasing Fe content increases the electro-catalytic activity of the STF surface as well as the electronic and ionic conductivity. Current collectors on top also increase the electrochemical activity due to a highly active Pt-atmosphere-STF triple phase boundary. Furthermore, the electrochemical activity depends decisively on the H₂:H₂O mixing ratio and the polarization. Lastly, Fe⁰ nanoparticles may evolve on the surface in hydrogen rich atmospheres and increase the hydrogen adsorption rate.

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Research Organization:: Krell Institute, Ames, IA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

Grant/Contract Number:: NA0002135

OSTI ID:: 1426161

Journal Information:: Journal of the Electrochemical Society, Vol. 164, Issue 4; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 31 works

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Title: The Electrochemical Properties of Sr(Ti,Fe)O 3-δ for Anodes in Solid Oxide Fuel Cells

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Title: The Electrochemical Properties of Sr(Ti,Fe)O _3-δ for Anodes in Solid Oxide Fuel Cells