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Study of oxygen electrode reactions on symmetrical porous SrTi0.30Fe0.70O3-δ electrodes on Ce0.8Gd0.2O1.9 electrolyte at 800 °C–500 °C
Abstract
Iron doped strontium titanates (SrTi1-xFexO3-δ) are an interesting mixed ionic-electronic conductor model used to study basic oxygen reduction/oxidation reactions. In this work, we performed an impedance spectroscopy study on symmetrical porous SrTi0.30Fe0.70O3-δ (STF70) electrodes on a ceriabased electrolyte. The sample was measured in varying oxygen concentration: from 0.3% to 100% in 800 °C - 500 °C temperature range. Low polarisation resistance (e.g. <125 mΩ cm2 at 600 °C in the air) values were obtained, showing an overall high performance of the STF70 electrode. Impedance data analysis was assisted by the distribution of relaxation times method, which allowed an equivalent electrical circuit to be proposed comprising of two resistance/constant phase element sub-circuits connected in series. The medium frequency contribution, with a characteristic frequency of ~2000 Hz at 800 °C in air, originates most probably from possible surface diffusion followed by charge transfer reaction limitation, whereas the lower frequency contribution (characteristic frequency <10 Hz) is due to gas-phase diffusion.
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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ELECTROCHIMICA ACTA
no. 346,
ISSN: 0013-4686 - Language:
- English
- Publication year:
- 2020
- Bibliographic description:
- Mroziński A., Molin S., Jasiński P.: Study of oxygen electrode reactions on symmetrical porous SrTi0.30Fe0.70O3-δ electrodes on Ce0.8Gd0.2O1.9 electrolyte at 800 °C–500 °C// ELECTROCHIMICA ACTA -Vol. 346, (2020), s.136285-
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.electacta.2020.136285
- Sources of funding:
- Verified by:
- Gdańsk University of Technology
Referenced datasets
- dataset Electrical conductivity of the SrTi1-xFexO3-d pellets at 20% pO2
- dataset Electrical conductivity of the (Ce0.80Gd0.20)O1.90 pellet at different oxygen partial pressures
- dataset Oxygen partial pressure and temperature dependence of R-CPE1 resistance of symmetrical porous SrTi0.30Fe0.70O3 electrode on CGO substrate
- dataset Oxygen partial pressure and temperature dependence of R-CPE2 frequency of symmetrical porous SrTi0.30Fe0.70O3 electrode on CGO substrate
- dataset Oxygen partial pressure and temperature dependence of R-CPE1 capacity of symmetrical porous SrTi0.30Fe0.70O3 electrode on CGO substrate
- dataset Oxygen partial pressure and temperature dependence of R-CPE1 frequency of symmetrical porous SrTi0.30Fe0.70O3 electrode on CGO substrate
- dataset Oxygen partial pressure and temperature dependence of R-CPE2 resistance of symmetrical porous SrTi0.30Fe0.70O3 electrode on CGO substrate
- dataset Electrochemical impedance spectroscopy and Distribution of Relaxation Times analysis results for porous SrTi0.30Fe0.70O3-d oxygen electrode measured at 600 °C and 15% oxygen partial pressure
- dataset Oxygen partial pressure and temperature dependence of R-CPE2 capacity of symmetrical porous SrTi0.30Fe0.70O3 electrode on CGO substrate
- dataset Laser microscope profilometry of SrTi0.3Fe0.7O3-d electrode surface after quickly drying
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