The electrochemical and thermodynamic characterization of PrBaCo2-xFexO5+δ (x=0, 0.5, 1) infiltrated into yttria-stabilized zirconia scaffold as cathodes for solid oxide fuel cells

被引:73
作者
Choi, Sihyuk [1 ]
Shin, Jeeyoung [2 ]
Kim, Guntae [1 ]
机构
[1] UNIST, Interdisciplinary Sch Green Energy, Ulsan 689798, South Korea
[2] Dong Eui Univ, Dept Mech Engn, Pusan 614714, South Korea
基金
新加坡国家研究基金会;
关键词
Solid oxide fuel cells; Cathode; Double perovskite; Oxygen nonstoichiometry; Thermodynamic property; Electrochemical performance; OXYGEN NONSTOICHIOMETRY; ELECTRICAL-PROPERTIES; SURFACE EXCHANGE; GDBACO2O5+X; DIFFUSION; PERFORMANCE; PEROVSKITES; COMPOSITES; KINETICS;
D O I
10.1016/j.jpowsour.2011.09.096
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effect of Fe substitution for Co on the thermodynamic and electrical properties of the double perovskites, PrBaCo2-xFexO5+delta (PBCF, x = 0, 0.5, 1), are investigated as cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs). At a given temperature, the electrical conductivity decreases with increasing Fe content, x, in the PBCF-YSZ composites in air. PBCF-YSZ (x = 1) composite appear to be more stable than PBCF-YSZ (x = 0) composite down to lower oxygen partial pressure, p(O-2), at the same temperature. The higher oxidation enthalpies of the x = 1 composite can also explain the superior stability at roughly the same p(O-2). The high entropy change for the x =1 composite can indicate the high probability in the formation of interstitial oxygen at approximately the same p(O-2). Impedance spectra of symmetrical cells (PBCF-YSZ/YSZ/PBCF-YSZ) show lower cathode polarization losses with increasing amounts of Fe. The maximum power densities of x = 0 composite and x = 0.5 composite are 0.68 and 0.72 W cm(-2), respectively, at 973 K. The maximum power density of the x = 1 composite is, however, about 20% higher than that of the other composites. Considering redox stability and electrochemical performance, higher Fe content of PrBaCo2-xFexO5+delta (x = 1) is more suitable as a cathode material than x = 0 composite in IT-SOFC application. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:10 / 17
页数:8
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