The Electrochemical Properties of Sr(Ti,Fe)O 3-δ for Anodes in Solid Oxide Fuel Cells
Abstract
Reduction-stable mixed ionic and electronic conductors such as Sr(Ti,Fe)O3-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.
- Authors:
-
[4];
- 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
- Publication Date:
- Research Org.:
- Krell Institute, Ames, IA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
- OSTI Identifier:
- 1426161
- Grant/Contract Number:
- NA0002135
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Electrochemical Society
- Additional Journal Information:
- Journal Volume: 164; Journal Issue: 4; Journal ID: ISSN 0013-4651
- Publisher:
- The Electrochemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; anode; defect chemistry; electrochemistry; impedance; mixed conductor; SOFC; solid oxide fuel cell; thin film; triple-phase boundary
Citation Formats
Nenning, Andreas, Volgger, Lukas, Miller, Elizabeth, Mogni, Liliana V., Barnett, Scott, and Fleig, Jürgen. The Electrochemical Properties of Sr(Ti,Fe)O 3-δ for Anodes in Solid Oxide Fuel Cells. United States: N. p., 2017.
Web. doi:10.1149/2.1271704jes.
Nenning, Andreas, Volgger, Lukas, Miller, Elizabeth, Mogni, Liliana V., Barnett, Scott, & Fleig, Jürgen. The Electrochemical Properties of Sr(Ti,Fe)O 3-δ for Anodes in Solid Oxide Fuel Cells. United States. https://doi.org/10.1149/2.1271704jes
Nenning, Andreas, Volgger, Lukas, Miller, Elizabeth, Mogni, Liliana V., Barnett, Scott, and Fleig, Jürgen. Sat .
"The Electrochemical Properties of Sr(Ti,Fe)O 3-δ for Anodes in Solid Oxide Fuel Cells". United States. https://doi.org/10.1149/2.1271704jes. https://www.osti.gov/servlets/purl/1426161.
@article{osti_1426161,
title = {The Electrochemical Properties of Sr(Ti,Fe)O 3-δ for Anodes in Solid Oxide Fuel Cells},
author = {Nenning, Andreas and Volgger, Lukas and Miller, Elizabeth and Mogni, Liliana V. and Barnett, Scott and Fleig, Jürgen},
abstractNote = {Reduction-stable mixed ionic and electronic conductors such as Sr(Ti,Fe)O3-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.},
doi = {10.1149/2.1271704jes},
journal = {Journal of the Electrochemical Society},
number = 4,
volume = 164,
place = {United States},
year = {Sat Feb 18 00:00:00 EST 2017},
month = {Sat Feb 18 00:00:00 EST 2017}
}
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