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Effect of Morphology of La 0.8 Sr 0.2 Co 0.2 Fe 0.8 O 3‐δ Cathode on the Electrochemical Performance of Solid Oxide Fuel Cell
Author(s) -
Hung IMing,
Wu JunSheng,
Hsu YouWen,
Lee YuChen
Publication year - 2012
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201200164
Subject(s) - solid oxide fuel cell , particle size , sintering , electrolyte , oxide , cathode , electrochemistry , calcination , polarization (electrochemistry) , materials science , chemical engineering , dielectric spectroscopy , grain size , ball mill , analytical chemistry (journal) , mineralogy , chemistry , electrode , metallurgy , catalysis , biochemistry , chromatography , engineering
The objective of this study was using different morphology of La 0.8 Sr 0.2 Co 0.2 Fe 0.8 O 3‐δ (LSCF) cathode to reduce the polarization of solid oxide fuel cell. Three kinds of LSCF powders with different particle size were used to investigate the affection on the electrochemical property of solid oxide fuel cell (SOFC). XRD and TEM results confirmed that the grain size of LSCF powders decreased with the grinding ball size decreased. Conductivity of LSCF electrodes increased with increasing temperature that showed the characteristics of p‐type conductor. At high temperature, there aremore oxygen vacancies in smaller particle size LSCF, that will increase the energy gap of charge carrier transfer between the B‐site cations and oxygen ions. AC impedance analysis revealed that smaller particle size LSCF had lower polarization resistance and the total polarization resistance was only 0.92 Ωcm2 at 800 °C. However, sintering shrinkage of smaller particle size LSCF was too large that attributed the poor adhesion between cathode and electrolyte. At 800 °C, the power density based on large particle sized LSCF was 65 mW/cm 2 , which was higher than that of the cell based on small particle sized LSCF.