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Co‐synthesis of Sm 0.5 Sr 0.5 CoO 3 ‐Sm 0.2 Ce 0.8 O 1.9 Composite Cathode with Enhanced Electrochemical Property for Intermediate Temperature SOFCs
Author(s) -
Jiang W.,
Wei B.,
Lü Z.,
Wang Z. H.,
Zhu X. B.,
Zhu L.
Publication year - 2014
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.201400022
Subject(s) - cathode , materials science , overpotential , electrochemistry , analytical chemistry (journal) , scanning electron microscope , oxygen , oxide , solid oxide fuel cell , anode , polarization (electrochemistry) , partial pressure , electrode , chemistry , composite material , metallurgy , organic chemistry , chromatography
A 70 wt.% Sm 0.5 Sr 0.5 CoO 3 – 30 wt.% Sm 0.2 Ce 0.8 O 1.9 (SSC–SDC73) composite cathode was co‐synthesized by a facile one‐step sol–gel method, which showed lower polarization resistance and overpotential than those of physically mixed SSC–SDC73 cathode. The polarization resistance of co‐synthesized SSC–SDC73 cathode at 800 °C was as low as 0.03 Ω cm 2 in air. Scanning electron microscopy (SEM) images showed that the enhanced electrochemical property was mainly attributed to the smaller grains and good dispersion of SSC and SDC phases within the composite cathode, leading to an increase in three‐phase boundary length. The dependence of polarization resistance with oxygen partial pressure indicated that the rate‐limiting step for oxygen reduction reaction was the dissociation of molecular oxygen to atomic oxygen process. An anode supported fuel cell with a co‐synthesized SSC–SDC73 cathode exhibited a peak power density of 924 mW cm −2 at 800 °C. Our results suggested that co‐synthesized composite was a promising cathode for intermediate temperature solid oxide fuel cells (IT‐SOFCs).