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Particle Coarsening Influence on Oxygen Reduction in LSM–YSZ Composite Materials
Author(s) -
Farlenkov A. S.,
Ananyev M. V.,
Eremin V. A.,
Porotnikova N. M.,
Kurumchin E. Kh.
Publication year - 2015
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201400106
Subject(s) - yttria stabilized zirconia , materials science , microstructure , diffusion , triple phase boundary , composite number , oxygen , particle (ecology) , phase (matter) , porosity , particle size , composite material , chemical engineering , analytical chemistry (journal) , chemistry , thermodynamics , ceramic , chromatography , cubic zirconia , oceanography , organic chemistry , engineering , geology , physics
The microstructure influence on the oxygen reduction process for the LSM–YSZ composite materials has been studied in this paper. To localize the effect of particle coarsening influence, the oxygen isotope exchange measurements with the gas phase analysis have been performed for LSM–YSZ | YSZ | LSM–YSZ symmetric cells during 300 and 1000 hours at T = 850 °C and Po 2 = 10 −2 atm. In order to find quantitative relations the changes in the oxygen surface exchange and the diffusion coefficients and its microstructure parameters such as porosity and triple phase boundary (TPB) length have been compared. The rate determining stage of the LSM–YSZ degradation has been suggested to be the LSM‐phase surface diffusion and the LSM surface diffusion coefficient have been estimated.