| Publication type: | Conference paper |
| Type of review: | Not specified |
| Title: | LST-CGO anodes : deconvolution of impedance spectra and relationship with composition and microstructure |
| Authors: | Burnat, Dariusz Holzer, Lorenz Nurk, Gunnar Heel, Andre |
| Proceedings: | Proceedings of 13th European SOFC & SOE Forum 2018 |
| Page(s): | 93 |
| Pages to: | 102 |
| Conference details: | 13th European SOFC & SOE Forum 2018, Lucerne, 3-6 July 2018 |
| Issue Date: | 2018 |
| ISBN: | 978-3-905592-23-8 |
| Language: | English |
| Subject (DDC): | 621.3: Electrical, communications, control engineering |
| Abstract: | Ni-free anodes in SOFC and SOEC that can withstand severe conditions and provide high performances, which is of great practical and scientific interest. Lanthanum doped strontium titanates (LST) are among the most interesting alternatives to state of the are Ni-YSZ due to their excellent redox stability [1] low reactivity with other fuel cell components [2] and good electronic conductivity. Insufficient ionic conductivity of LST is only one of few drawbacks of this class of materials and can be mitigated through fabrication and optimization of composite electrodes containing LST and good ionic conductor (e.g. CGO or YSZ). In this study the electrochemical performance of ceramic (Ni-free) SOFC anodes, consisting of A-site deficient La0.2Sr0.7TiO3-d (LST) perovskite and Gd0.1Ce0.9O1.95-d (CGO), was thoroughly investigated. Microstructures and compositions were systematically modified to gain information about the microstructural impact on electrochemical performance. The highest impedances are measured at low frequencies, which in contrast to the literature cannot be linked with gas concentration impedance. The low frequency process (ca. ~1 Hz) was attributed to the chemical capacitance. The EIS and advanced microstructure quantification methodology point out that the chemical capacitance correlates inversely with the available surface area of CGO. The influence of CGO surface reactions, such as hydrogen adsorption, which represent the kinetic limitation for the dominant anode process at 1 Hz region and for the associated chemical capacitance, is discussed. The impact of 30 isothermal redox cycles on degradation and the anode performance is presented. |
| Further description: | B0607 |
| URI: | https://digitalcollection.zhaw.ch/handle/11475/8934 |
| Fulltext version: | Published version |
| License (according to publishing contract): | Not specified |
| Departement: | School of Engineering |
| Organisational Unit: | Institute of Computational Physics (ICP) Institute of Materials and Process Engineering (IMPE) |
| Appears in collections: | Publikationen School of Engineering |
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Burnat, D., Holzer, L., Nurk, G., & Heel, A. (2018). LST-CGO anodes : deconvolution of impedance spectra and relationship with composition and microstructure [Conference paper]. Proceedings of 13th European SOFC & SOE Forum 2018, 93–102.
Burnat, D. et al. (2018) ‘LST-CGO anodes : deconvolution of impedance spectra and relationship with composition and microstructure’, in Proceedings of 13th European SOFC & SOE Forum 2018, pp. 93–102.
D. Burnat, L. Holzer, G. Nurk, and A. Heel, “LST-CGO anodes : deconvolution of impedance spectra and relationship with composition and microstructure,” in Proceedings of 13th European SOFC & SOE Forum 2018, 2018, pp. 93–102.
BURNAT, Dariusz, Lorenz HOLZER, Gunnar NURK und Andre HEEL, 2018. LST-CGO anodes : deconvolution of impedance spectra and relationship with composition and microstructure. In: Proceedings of 13th European SOFC & SOE Forum 2018. Conference paper. 2018. S. 93–102. ISBN 978-3-905592-23-8
Burnat, Dariusz, Lorenz Holzer, Gunnar Nurk, and Andre Heel. 2018. “LST-CGO Anodes : Deconvolution of Impedance Spectra and Relationship with Composition and Microstructure.” Conference paper. In Proceedings of 13th European SOFC & SOE Forum 2018, 93–102.
Burnat, Dariusz, et al. “LST-CGO Anodes : Deconvolution of Impedance Spectra and Relationship with Composition and Microstructure.” Proceedings of 13th European SOFC & SOE Forum 2018, 2018, pp. 93–102.
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