Journal
JOURNAL OF POWER SOURCES
Volume 269, Issue -, Pages 180-188Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.06.164
Keywords
Lanthanum strontium cobaltite ferrite; Doped ceria; Composite cathode; Solid oxide fuel cell; Electrical conductivity relaxation
Funding
- Ministry of Science and Technology of China [2012CB215403]
- National Natural Science Foundation of China [51372239]
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Oxygen reduction at ISCF-SDC (La0.6Sr0.4Co0.2Fe0.8O3 - (delta)-Sm0.2Ce0.8O1.9) composite cathode might take place at the LSCF-gas two-phase interface (2 PB) and the LSCF-SDC-gas three-phase boundary (3 PB). A method is developed to determine the oxygen incorporation rate and the amount of incorporated oxygen at 3 PB using the electrical conductivity relaxation technique. The obtained results are powerful supports to the viewpoint that oxygen incorporation at 3 PB is much more facile than that at 2 PB. The amount of oxygen incorporated absolutely at 3 PB plays a dominating role in the total process, which actually contributes an average of more than 70% when only 4.5 vol. % SDC is added to LSCF. The incorporation rate at 3 PB is found to be affected not only by the 3 PB length but also the diffusion of oxygen species on the LSCF surface. An effective surface diffusion length of about 1.5 mu m is suggested by the relation between the rate, 3 PB length and LSCF surface area. (C) 2014 Elsevier B.V. All rights reserved.
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