Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 164, Issue 4, Pages F364-F371Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.1271704jes
Keywords
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Funding
- Austrian Science Fund (FWF) [P4509-N16, W1243-N16]
- US NSF fund [DMR-1506925]
- DOE fund [DE-NA0002135]
- [ANPCyT-PICT2013-1032]
- Direct For Mathematical & Physical Scien [1506055] Funding Source: National Science Foundation
- Division Of Materials Research [1506055] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1506925] Funding Source: National Science Foundation
- Austrian Science Fund (FWF) [W1243] Funding Source: Austrian Science Fund (FWF)
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Reduction-stable mixed ionic and electronic conductors such as Sr(Ti,Fe)O-3-delta (STF) are promisingmaterials 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 H-2+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 H-2:H2O mixing ratio and the polarization. Fe-0 nanoparticles may evolve on the surface in hydrogen rich atmospheres and increase the hydrogen adsorption rate. (C) The Author(s) 2017. Published by ECS.
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