LnBaCo2O5+δ oxides as cathodes for intermediate-temperature solid oxide fuel cells
LnBaCo2O5+δ oxides as cathodes for intermediate-temperature solid oxide fuel cells
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DOI：
10.1149/1.2839028
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发表时间：
2008-01-01
影响因子：
3.9
通讯作者：
Manthiram, A.
中科院分区：
文献类型：
--
作者：
Kim, J. -H.;Manthiram, A.
研究了具有钙钛矿结构的LnBaCo（2）O（5+delta）（Ln = Nd、Sm、Gd和Y）氧化物作为中温固体氧化物燃料电池（SOFC）阴极材料的性能。氧含量5 + δ、热膨胀系数（TEC）和电导率（金属）随着Ln（3+）离子的尺寸从Ln = La到Y减小而减小。虽然TEC的降低是由于Ln-O键的离子性降低，但电导率的降低是由于氧化物离子空位的增加和O-Co-O键的弯曲。采用LnBaCo（2）O（5+delta）阴极、La0.8Sr0.2Ga0.8Mg0.2O2.8电解质和Ni-Ce0.9Gd0.1O1.95金属陶瓷阳极制造的单电池固体氧化物燃料电池的功率密度随着Ln（3+）离子尺寸的减小而减小，部分原因是电导率降低。LnBaCo（2）O（5+delta）阴极具有中间镧系离子如Sm 3+，提供了催化活性和TEC之间的折衷。(c)2008年电化学学会。
LnBaCo(2)O(5+delta) (Ln = Nd, Sm, Gd, and Y) oxides with a cation ordered perovskite structure have been investigated as cathode materials for intermediate-temperature solid oxide fuel cells (SOFCs). The oxygen content 5 + delta, thermal expansion coefficient (TEC), and electrical conductivity (metallic) decrease with decreasing size of the Ln(3+) ions from Ln = La to Y. While the decrease in TEC is due to the decreasing ionicity of the Ln-O bond, the decrease in electrical conductivity is due to the increasing oxide ion vacancies and a bending of the O-Co-O bonds. The power density of single-cell SOFCs fabricated with the LnBaCo(2)O(5+delta) cathodes, La0.8Sr0.2Ga0.8Mg0.2O2.8 electrolyte, and Ni-Ce0.9Gd0.1O1.95 cermet anode decrease with decreasing size of the Ln(3+) ions, partly due to a decreasing electrical conductivity. The LnBaCo(2)O(5+delta) cathodes with an intermediate lanthanide ion such as Sm3+ offer a trade-off between catalytic activity and TEC. (c) 2008 The Electrochemical Society.