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Characteristics of LaCo 0.4 Ni 0.6-x Cu x O 3-δ ceramics as a cathode material for intermediate-temperature solid oxide fuel cells
Abstract
In this study, the effects of Cu-ion substitution on the densification, microstructure, and physical properties of LaCo0.4Ni0.6-xCuxO3-δ ceramics were investigated. The results indicate that doping with Cu ions not only enhances the densification but also promotes the grain growth of LaCo0.4Ni0.6-xCuxO3-δ ceramics. The Cu substitution at x ≤ 0.2 can suppress the formation of La4Ni3O10, while the excess Cu triggers the formation of La2CuO4.032 phase. The p-type conduction of LaCo0.4Ni0.6O3-δ ceramic was significantly raised by Cu substitution because the acceptor doping () triggered the formation of hole carriers; this effect was maximized in the case of LaCo0.4Ni0.4Cu0.2O3-δ composition (1480 S cm−1 at 500 °C). Thermogravimetric data revealed a slight weight increase of 0.29% for LaCo0.4Ni0.4Cu0.2O3-δ compact up to 871 °C; this is due to the incorporation of oxygen that creates metal vacancies and additional carriers, partially compensating the conductivity loss due to the spin-disorder scattering. As the temperature of the LaCo0.4Ni0.4Cu0.2O3-δ compacts rose above 871 °C, significant weight loss with temperature was observed because of the release of lattice oxygen to the ambient air as a result of Co (IV) thermal reduction accompanied by the formation of oxygen vacancies. A solid oxide fuel cell (SOFC) single cell with Sm0.2Ce0.8O2-δ (electrolyte) and LaCo0.4Ni0.4Cu0.2O3-δ (cathode) was built and characterized. The Ohmic (0.256 Ω cm2) and polarization (0.434 Ω cm2) resistances of the single cell at 700 °C were determined; and the maximum power density was 0.535 W cm−2. These results show that LaCo0.4Ni0.4Cu0.2O3-δ is a very promising cathode material for SOFC applications.
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Authors (5)
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Yi-Xin Liu
- National Taipei University of Technology Department of Materials and Mineral Resources Engineering
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Sea-Fue Wang
- National Taipei University of Technology Department of Materials and Mineral Resources Engineering
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Yung-Fu Hsu
- National Taipei University of Technology Department of Materials and Mineral Resources Engineering
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Hung-Wei Kai
- National Taipei University of Technology Department of Materials and Mineral Resources Engineering
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
no. 38,
pages 1654 - 1662,
ISSN: 0955-2219 - Language:
- English
- Publication year:
- 2018
- Bibliographic description:
- Liu Y., Wang S., Hsu Y., Kai H., Jasiński P.: Characteristics of LaCo 0.4 Ni 0.6-x Cu x O 3-δ ceramics as a cathode material for intermediate-temperature solid oxide fuel cells// JOURNAL OF THE EUROPEAN CERAMIC SOCIETY. -Vol. 38, iss. 4 (2018), s.1654-1662
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.jeurceramsoc.2017.11.019
- Verified by:
- Gdańsk University of Technology
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