Barium- and strontium-enriched (Ba0.5Sr0.5)1+xCo0.8Fe0.2O3-δ oxides as high-performance cathodes for intermediate-temperature solid-oxide fuel cells

被引：122

作者：

Zhou, Wei ^{[1
]}

Ran, Ran ^{[1
]}

Shao, Zongping ^{[1
]}

Zhuang, Wei ^{[1
]}

Jia, Jing ^{[1
]}

Gu, Hongxia ^{[1
]}

Jin, Wanqin ^{[1
]}

Xu, Nanping ^{[1
]}

机构：

[1] Nanjing Univ Technol, State Key Lab Mat Oriented Chem Engn, Nanjing 210009, Jiangsu, Peoples R China

来源：

ACTA MATERIALIA | 2008年 / 56卷 / 12期

基金：

中国国家自然科学基金;

关键词：

perovskites; fuel cell materials; electrochemistry; vacancies; electrochemical impedance;

D O I：

10.1016/j.actamat.2008.02.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

(Ba0.5Sr0.5)(1+x)Co0.8Fe0.2O3-delta, or BSCF(I + x), (0 <= x <= 0.3) oxides were synthesized and investigated as cathodes for intermediate-temperature solid-oxide fuel cells. The A-site cation excess in BSCF(I + x) resulted in a lattice expansion and the creation of more active sites for oxygen reduction reaction due to the lowered valence states of the B-site ions and the increased oxygen vacancy concentration, which improved the oxygen adsorption process. On the other hand, the A-site excess could also result in higher resistances for oxygen adsorption (due to the formation of BaO and/or SrO impurities), and oxygen-ion transfer (by facilitating the solid-phase reaction between the cathode and the electrolyte). By taking all these factors into account, we found BSCF1.03 to be the optimal composition, which lead to a peak power density of 1026.2 +/- 12.7 mW cm(-2) at 650 degrees C for a single cell. (c) 2008 ACta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2687 / 2698

页数：12

共 59 条

[1] Mechanism and kinetics of oxygen reduction on porous La1-xSrxCoO3-δ electrodes [J].