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Electrochemical properties of porous Sr0.86Ti0.65Fe0.35O3 oxygen electrodes in solid oxide cells: Impedance study of symmetrical electrodes
Abstract
This work evaluates porous Sr0.86Ti0.65Fe0.35O3 (STF35) as a possible oxygen electrode material for Solid Oxide Cells. The powder synthesis was performed by solid state method. Characterization included DC electrical conductivity study of sintered bulk samples and impedance spectroscopy study of symmetrical electrodes deposited on gadolinium doped ceria substrates. Measurements were carried out in atmospheres with different pO2 levels: 0.1%–20% O2. Detailed equivalent circuit analysis was carried out in order to clarify the reaction pathway on porous electrode, which extends knowledge available for dense model electrodes. At 800 °C in 21% O2, the DC electrical conductivity of STF35 pellet was 0.6 S cm−1 and the polarization resistance of the electrode in the symmetrical cell was ∼100 mΩ cm2. Detailed impedance spectroscopy studies revealed that the largest contribution (∼80%) towards the polarization resistance is due to oxygen adsorption, which is limiting the oxygen reduction performance of the porous STF35 electrode. These results show the applicability of advanced impedance analysis methods (e.g. Distribution of Relaxation Times - DRT) for description of complex impedance electrode phenomena of porous electrodes.
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
no. 44,
pages 1827 - 1838,
ISSN: 0360-3199 - Language:
- English
- Publication year:
- 2019
- Bibliographic description:
- Mroziński A., Molin S., Karczewski J., Miruszewski T., Jasiński P.: Electrochemical properties of porous Sr0.86Ti0.65Fe0.35O3 oxygen electrodes in solid oxide cells: Impedance study of symmetrical electrodes// INTERNATIONAL JOURNAL OF HYDROGEN ENERGY. -Vol. 44, nr. 3 (2019), s.1827-1838
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.ijhydene.2018.11.203
- Sources of funding:
-
- Project Understanding and minimization of ohmic and polarization losses in solid oxide cells by nanocrystalline ceramic and cermet functional layers
- Statutory activity/subsidy
- Verified by:
- Gdańsk University of Technology
Referenced datasets
- dataset X-ray diffractometry results of the Sr0.86Ti0.65Fe0.35O3 powder
- dataset Oxygen partial pressure and temperature dependence of Gerischer element of symmetrical porous Sr0.86Ti0.65Fe0.35O3 electrode on CGO substrate
- dataset Area specific resistance (at 800 °C - 500 °C) of the Sr0.86Ti0.65Fe0.35O3 porous oxygen electrodes sintered at different temperatures
- dataset Fitted impedance spectra of a symmetrical porous Sr0.86Ti0.65Fe0.35O3 oxygen electrode (sintered at 1000 °C, measured at 700 °C and 0.1% pO2) with an individual contributions of the respective fitting elements
- dataset Oxygen partial pressure and temperature dependence of low frequency capacitance of symmetrical porous Sr0.86Ti0.65Fe0.35O3 electrode on CGO substrate
- dataset Distribution of Relaxation Times analysis results of impedance of porous Sr0.86Ti0.65Fe0.35O3 oxygen electrode (sintered at 1000 °C) as a function of oxygen partial pressure at 800 °C
- dataset Electrical conductivity of the Sr0.86Ti0.65Fe0.35O3-d pellet at different oxygen partial pressures
- dataset Distribution of Relaxation Times analysis results of impedance of porous Sr0.86Ti0.65Fe0.35O3 oxygen electrode (sintered at 1000 °C) as a function of measuring temperature at 0.1% pO2
- dataset Oxygen partial pressure and temperature dependence of middle frequency capacitance of symmetrical porous Sr0.86Ti0.65Fe0.35O3 electrode on CGO substrate
- dataset Fitted impedance spectra of a symmetrical porous Sr0.86Ti0.65Fe0.35O3 oxygen electrode (sintered at 1000 °C, measured at 800 °C and 0.1% pO2) with an individual contributions of the respective fitting elements
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