Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 35, Issue 9, Pages 4270-4275Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2010.01.063
Keywords
Samaria-doped ceria (SDC); Carbonate; Composite electrolyte; Electrical property; Conduction mechanism; Low-temperature solid oxide fuel cells (SOFCs)
Categories
Funding
- National Basic Research Program of China [2007CB209705]
- National Natural Science Foundation of China [50902083]
- EC [SSA 032308]
- China Postdoctoral Science Foundation [20090450378]
Ask authors/readers for more resources
Samaria-doped ceria (SDC)/carbonate composite electrolytes were developed for low-temperature solid oxide fuel cells (SOFCs). SDC powders were prepared by oxalate co-precipitation method and used as the matrix phase. Binary alkaline carbonates were selected as the second phase, including (Li-Na)(2)CO3, (Li-K)(2)CO3 and (Na-K)(2)CO3. AC conductivity measurements showed that the conductivities in air atmosphere depended on the salt composition. A sharp conductivity jump appeared at 475 degrees C and 450 degrees C for SDC/(Li-Na)(2)CO3 and SDC/(Li-K)(2)CO3, respectively. However, the conductivities of SDC/(NaK)(2)CO3 increase linearly with temperature. Single cells based on above composite electrolytes were fabricated by dry-pressing and tested in hydrogen/air at 500-600 degrees C. A maximum power density of 600, 550 and 550 mW cm(-2) at 600 degrees C was achieved with SDC/ (Li-Na)(2)CO3, SDC/(Li-K)(2)CO3 and SDC/(Na-K)(2)CO3 composite electrolyte, respectively, which we attribute to high ionic conductivities of these composite electrolytes in fuel cell atmosphere. We discuss the conduction mechanisms of SDC/carbonate composite electrolytes in different atmospheres according to defect chemistry theory. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available