期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 38, 期 36, 页码 16365-16372出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2013.10.003
关键词
Layered perovskite; Electrochemical performance; Cathode; Solid oxide fuel cell
资金
- National Nature Science Foundation of China [20973021]
- National Basic Research Program of China [2013CB934003, 2012CB215405]
Pr1-xYxBaCo2O5+delta (x = 0.3, 0.5 and 0.7) oxides were prepared and evaluated as cathode materials for intermediate-temperature solid oxide fuel cells. The effect of Y-doping on the crystal structure, oxygen vacancy concentration, thermal expansion coefficient (TEC), electrical conductivity and cathode performance of Pr1-xYxBaCo2O5+delta was investigated. These properties were compared with that of GdBaCo2O5+delta having a middle element of lanthanides. Pr1-xYxBaCo2O5+delta shows TEC (similar to 17.6 x 10(-6) K-1) lower than that of undoped PrBaCo2O5+delta, but similar to the one for GdBaCo2O5+delta. Y-doping causes a decrease in electrical conductivity, but at the same time induces an increase in oxygen vacancy concentration. With increasing Y-doping level, the area specific resistance (ASR) of Pr1-xYxBaCo2O5+delta-based electrode in a symmetrical cell increases, and correspondingly, the peak power density of single-cell decreases slightly. Nevertheless, comparing to GdBaCo2O5+delta-based electrode, Pr1-xYxBaCo2O5+delta (x = 0.3-0.7) exhibits significantly lower ASR, and allows to obtain cells with higher maximum power density. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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