Electrochemical Impedance Spectroscopy Study of Ceria- and Zirconia-Based Solid Electrolytes for Application Purposes in Fuel Cells and Gas Sensors
In this study, the structural and electrochemical properties of commercial powders of the nominal compositions Ce<sub>0.8</sub>Gd<sub>0.2</sub>O<sub>1.9</sub>, Sc<sub>0.1</sub>Ce<sub>0.01</sub>Zr<sub>0.89</sub>O<sub>1.95</sub>, and Sc<sub>0.09</sub>Yb<sub>0.01</sub>Zr<sub>0.9</sub>O<sub>1.95</sub> were investigated. The materials are prospective candidates to be used in electrochemical devices, i.e., gas sensors and fuel cells. Based on a comparison of the EIS spectra in different atmospheres (synthetic air, 3000 ppm NH<sub>3</sub> in argon, 10% H<sub>2</sub> in argon), the reactions on the three-phase boundaries were proposed, as well as the conduction mechanisms of the electrolytes were described. The Ce<sub>0.8</sub>Gd<sub>0.2</sub>O<sub>1.9</sub> material is a mixed ionic-electronic conductor, which makes it suitable for anode material in fuel cells. Moreover, it exhibits an apparent and reversible response for ammonia, indicating the possibility of usage as an NH<sub>3</sub> gas-sensing element. In zirconia-based materials, electrical conduction is realized by oxygen ion carriers. Among them, the most promising from an applicative point of view seems to be Sc<sub>0.09</sub>Yb<sub>0.01</sub>Zr<sub>0.9</sub>O<sub>1.95</sub>, showing a high, reversible reaction with hydrogen.
Authors
- Beata Paczosa‐Bator (ORCID: https://orcid.org/0000-0002-2838-462X)
- Robert Piech (ORCID: https://orcid.org/0000-0001-9551-0609)
- M. Dziubaniuk (ORCID: https://orcid.org/0000-0002-0889-3232)
Institutions
- Jagiellonian University (PL)
- AGH University of Krakow (PL)
Publication Details
- Journal
- Materials
- Published
- 2024-10-26
- DOI
- https://doi.org/10.3390/ma17215224
- Primary Topic
- Advancements in Solid Oxide Fuel Cells
- Type
- article
- Field-Weighted Citation Impact
- 0.00