Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes
This review paper focuses on the phenomenon of thermochemical expansion of two specific categories of conducting ceramics: Proton Conducting Ceramics (PCC) and Mixed Ionic-Electronic Conductors (MIEC). The theory of thermal expansion of ceramics is underlined from microscopic to macroscopic points o...
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| Format: | Article |
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MDPI AG
2018-09-01
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| Series: | Crystals |
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| Online Access: | http://www.mdpi.com/2073-4352/8/9/365 |
| _version_ | 1818011610641334272 |
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| author | Andreas Løken Sandrine Ricote Sebastian Wachowski |
| author_facet | Andreas Løken Sandrine Ricote Sebastian Wachowski |
| author_sort | Andreas Løken |
| collection | DOAJ |
| description | This review paper focuses on the phenomenon of thermochemical expansion of two specific categories of conducting ceramics: Proton Conducting Ceramics (PCC) and Mixed Ionic-Electronic Conductors (MIEC). The theory of thermal expansion of ceramics is underlined from microscopic to macroscopic points of view while the chemical expansion is explained based on crystallography and defect chemistry. Modelling methods are used to predict the thermochemical expansion of PCCs and MIECs with two examples: hydration of barium zirconate (BaZr1−xYxO3−δ) and oxidation/reduction of La1−xSrxCo0.2Fe0.8O3−δ. While it is unusual for a review paper, we conducted experiments to evaluate the influence of the heating rate in determining expansion coefficients experimentally. This was motivated by the discrepancy of some values in literature. The conclusions are that the heating rate has little to no effect on the obtained values. Models for the expansion coefficients of a composite material are presented and include the effect of porosity. A set of data comprising thermal and chemical expansion coefficients has been gathered from the literature and presented here divided into two groups: protonic electrolytes and mixed ionic-electronic conductors. Finally, the methods of mitigation of the thermal mismatch problem are discussed. |
| first_indexed | 2024-04-14T06:09:59Z |
| format | Article |
| id | doaj.art-d62863786c624d5283cbfc2a5757bc25 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-04-14T06:09:59Z |
| publishDate | 2018-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-d62863786c624d5283cbfc2a5757bc252022-12-22T02:08:23ZengMDPI AGCrystals2073-43522018-09-018936510.3390/cryst8090365cryst8090365Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible ElectrodesAndreas Løken0Sandrine Ricote1Sebastian Wachowski2Centre for Earth Evolution and Dynamics, University of Oslo, N-0315 Oslo, NorwayDepartment of Mechanical Engineering, Colorado School of Mines, Golden, CO 80401, USADepartment of Solid State Physics, Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, 80233 Gdańsk, PolandThis review paper focuses on the phenomenon of thermochemical expansion of two specific categories of conducting ceramics: Proton Conducting Ceramics (PCC) and Mixed Ionic-Electronic Conductors (MIEC). The theory of thermal expansion of ceramics is underlined from microscopic to macroscopic points of view while the chemical expansion is explained based on crystallography and defect chemistry. Modelling methods are used to predict the thermochemical expansion of PCCs and MIECs with two examples: hydration of barium zirconate (BaZr1−xYxO3−δ) and oxidation/reduction of La1−xSrxCo0.2Fe0.8O3−δ. While it is unusual for a review paper, we conducted experiments to evaluate the influence of the heating rate in determining expansion coefficients experimentally. This was motivated by the discrepancy of some values in literature. The conclusions are that the heating rate has little to no effect on the obtained values. Models for the expansion coefficients of a composite material are presented and include the effect of porosity. A set of data comprising thermal and chemical expansion coefficients has been gathered from the literature and presented here divided into two groups: protonic electrolytes and mixed ionic-electronic conductors. Finally, the methods of mitigation of the thermal mismatch problem are discussed.http://www.mdpi.com/2073-4352/8/9/365thermal expansionchemical expansionprotonic conductorsproton ceramic fuel cellsTECCTEhigh temperature proton conductors |
| spellingShingle | Andreas Løken Sandrine Ricote Sebastian Wachowski Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes Crystals thermal expansion chemical expansion protonic conductors proton ceramic fuel cells TEC CTE high temperature proton conductors |
| title | Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes |
| title_full | Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes |
| title_fullStr | Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes |
| title_full_unstemmed | Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes |
| title_short | Thermal and Chemical Expansion in Proton Ceramic Electrolytes and Compatible Electrodes |
| title_sort | thermal and chemical expansion in proton ceramic electrolytes and compatible electrodes |
| topic | thermal expansion chemical expansion protonic conductors proton ceramic fuel cells TEC CTE high temperature proton conductors |
| url | http://www.mdpi.com/2073-4352/8/9/365 |
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