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Impact of strontium non-stoichiometry of SrxTi0.3Fe0.7O3-δ on structural, electrical, and electrochemical properties for potential oxygen electrode of intermediate temperature solid oxide cells
Abstract
This work presents the results of a comprehensive study on the impact of the A-site non-stoichiometry of SrxTi0.3Fe0.7O3-δ (x = 0.90, 0.95, 1.00, 1.05) ceramics on their physicochemical properties. The materials were fabricated by the conventional solid-state reaction method and their structure was determined by X-ray diffractometry, X-ray photoelectron spectroscopy and electron microscopy. Their sintering and thermal expansion properties were then evaluated. The electrical properties of the materials were determined by electrical conductivity and electrical relaxation measurements (on bulk materials) and by electrochemical impedance spectroscopy (EIS) studies of symmetrical, CGO-electrolyte based, porous electrodes. Finally, fuel cell tests with the non-stoichiometric electrodes were evaluated. To elucidate the electrochemical reaction pathways for oxygen reduction/evolution reaction, EIS measurements were carried out in different pO2 and were analysed via the distribution of relaxation times method. The results showed a dependence of materials’ properties on the A-site non-stoichiometry, which can be used to fine-tune their properties, e.g. increase the surface exchange rate or decrease the thermal expansion coefficient.
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- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.ijhydene.2023.05.323
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
no. 48,
pages 35250 - 35266,
ISSN: 0360-3199 - Language:
- English
- Publication year:
- 2023
- Bibliographic description:
- Mroziński A., Molin S., Błaszczak P., Miruszewski T., Górnicka K., Karczewski J., Jasiński P.: Impact of strontium non-stoichiometry of SrxTi0.3Fe0.7O3-δ on structural, electrical, and electrochemical properties for potential oxygen electrode of intermediate temperature solid oxide cells// INTERNATIONAL JOURNAL OF HYDROGEN ENERGY -Vol. 48,iss. 90 (2023), s.35250-35266
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.ijhydene.2023.05.323
- Sources of funding:
- Verified by:
- Gdańsk University of Technology
Referenced datasets
- dataset SEM images of symmetrical cell interface with Sr1.05Ti0.30Fe0.70O3-d electrodes and CGO-20 substrate sintered at 800 °C, 900 °C and 1000 °C
- dataset Thermogravimetric analysis (TGA) of the SrxTi0.30Fe0.70O3-d materials
- dataset SEM images of Solid Oxide Fuel Cell interface with La0.6Sr0.4Co0.2Fe0.8O3-δ oxygen electrodes sintered at 1050 °C before and after test
- dataset SEM images of symmetrical cell interface with Sr0.90Ti0.30Fe0.70O3-d electrodes and CGO-20 substrate sintered at 800 °C, 900 °C and 1000 °C
- dataset SEM images of Solid Oxide Fuel Cell interface with Sr0.95Ti0.30Fe0.70O3-d oxygen electrodes sintered at 800 °C before and after test
- dataset Dilatometry results of SrxTi0.30Fe0.70O3-d materials
- dataset SEM images of symmetrical cell interface with Sr0.95Ti0.30Fe0.70O3-d electrodes and CGO-20 substrate sintered at 800 °C, 900 °C and 1000 °C
- dataset SEM images of symmetrical cell interface with Sr1.00Ti0.30Fe0.70O3-d electrodes and CGO-20 substrate sintered at 800 °C, 900 °C and 1000 °C
- dataset X-ray diffractometry results of the Sr1.05Ti0.30Fe0.70O3-d material before and after H2-TPR measurement
- dataset X-ray diffractometry results of the Sr0.90Ti0.30Fe0.70O3-d material before and after H2-TPR measurement
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