Journal
INORGANIC CHEMISTRY
Volume 58, Issue 14, Pages 9368-9377Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.9b01104
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Funding
- MINECO (Spain) [RTI2018-093735-B-100, MAT2016-77648-R]
- University of Malaga
- Spanish Ministry of Education, Culture and Sport [FPU17/02621]
- FEDER
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La-doped CeO2 materials have been widely investigated for potential applications in different high-temperature electrochemical devices, such as fuel cells and ceramic membranes for hydrogen production. However, the crystal structure is still controversial, and different models based on fluorite, pyrochlore, and/or type-C structures have been considered, depending on the lanthanum content and synthesis method used. In this work, an exhaustive structural analysis of the Ce1-xLaxO2-x/2 system (0.2 < x <= 0.7) is performed with different techniques. The average crystal structure, studied by conventional X-ray diffraction, could be considered to be a disordered fluorite; however, the local structure, examined by electron diffraction and Raman spectroscopy, reveals a biphasic mixture of fluorite and C-type phases. The thermal and electrical properties demonstrate that the materials with x >= 0.4 are oxide ion proton conductors in an oxidizing atmosphere and mixed ionic electronic conductors in a reducing atmosphere. The water uptake and proton conductivity increase gradually with the increase in La content, suggesting that the formation of the C-type phase is responsible for the proton conduction in these materials.
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