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Mn‐Stabilised Microstructure and Performance of Pd‐impregnated YSZ Cathode for Intermediate Temperature Solid Oxide Fuel Cells
Author(s) -
Liang F. L.,
Chen J.,
Jiang S. P.,
Wang F. Z.,
Chi B.,
Pu J.,
Jian Li
Publication year - 2009
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.200800078
Subject(s) - microstructure , cathode , materials science , dielectric spectroscopy , yttria stabilized zirconia , scanning electron microscope , solid oxide fuel cell , oxide , chemical engineering , electrochemistry , thermal stability , analytical chemistry (journal) , composite material , electrode , metallurgy , electrolyte , chemistry , cubic zirconia , ceramic , chromatography , engineering
The effect of Mn alloying on PdO powder and Pd‐impregnated Pd + YSZ cathode for the O 2 reduction reaction in intermediate temperature solid oxide fuel cells has been studied in detail. The microstructure, thermal stability, electrochemical activity and performance stability of the powder and cathode were analysed using thermal gravimetric analysis, X‐ray diffraction, scanning electron microscopy/energy dispersive spectroscopy and electrochemical impedance spectroscopy. The results indicate that an addition of 5 mol.‐% Mn effectively inhibits the growth and coalescence of Pd and PdO particles at high temperatures and stabilises the microstructure of the powders and the electrode; as a consequence, the electrochemical performance and stability of the cathode are significantly improved. The electrochemical performance of the Pd + YSZ and Pd 0.95 Mn 0.05 + YSZ cathodes so prepared is much better than that of the conventional LSM‐based cathodes and is also comparable with the mixed ionic and electronic conducting oxide cathodes such as LSCF.