期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 557, 期 -, 页码 196-201出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.01.002
关键词
LSM; Cu doping; Structural analysis; Electrical conductivity; Area specific resistance
资金
- National Research Foundation of Korea (NRF)
- Korea government (MSET) through GCRC-SOP [2011-0030658]
Copper-doped lanthanum strontium manganite (LSM) system, La0.8Sr0.2Mn1 xCuxO3 (delta)(0 <= x <= 0.3), was synthesized using the EDTA-combined citrate process and their characteristics were investigated for solid oxide fuel cell (SOFC) cathode applications. In all compositions, a single perovskite phase was obtained after calcination at 750 degrees C for 10 h. The maximum electrical conductivity at elevated temperatures was obtained at a composition of x = 0.2 (190 S cm (1) at 750 degrees C), whereas the sample with x = 0.3 showed the minimum value (100 S cm (1) at 750 degrees C). The increase in electrical conductivity with increasing Cu contents was attributed to a charge compensating transition of the Mn3+-Mn4+ and the reason for the decreased value, at x = 0.3, is mainly due to the presence of a second phase. The cathode area specific resistance of the sample with x = 0.2 was 4.3 Omega cm(2) at 750 degrees C, which is lower than that of LSM (x = 0). The enhanced performance with the addition of Cu can be explained by the additional Mn4+ promoting the formation of surface oxygen vacancies when Mn4+ is converted to Mn3+ at high temperatures. Copper ion doping at the B-site of LSM affects the formation of oxygen vacancies, which can enhance the oxygen reduction reaction. (c) 2013 Elsevier B.V. All rights reserved.
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