Structural and electrochemical properties of B-site Mg-doped La0.7Sr0.3MnO3-δ perovskite cathodes for intermediate temperature solid oxide fuel cells

被引：29
作者：
Gan, Lu [1 ,2 ]
Zhong, Qin [1 ,2 ]
Zhao, Xiaolu [1 ,2 ]
Song, Yang [1 ,2 ]
Bu, Yunfei [1 ,2 ]
机构：
[1] Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing 210094, Jiangsu, Peoples R China
[2] Nanjing AIREP Environm Protect Technol Co Ltd, Nanjing 210091, Jiangsu, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 655卷
基金：
中国国家自然科学基金;
关键词：
Solid oxide fuel cells; Cathode material; Perovskite; Electrochemical properties; OXYGEN REDUCTION REACTION; ELECTRONIC-STRUCTURE; LSM; MANGANITE; INSIGHTS; SOFCS; PROGRESS; SULFUR; MN;
D O I：
10.1016/j.jallcom.2015.09.136
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：
A series of La0.7Sr0.3Mn3-delta (LSM)-based perovskite cathode material with B-site Mg-doped composition La0.7Sr0.3Mn1-xMgxO3-delta (LSMM, x = 0, 0.1, 0.2) was successfully synthesized by a combined EDTA-citrate complexing method. The effect of the introduction of Mg into the Mn-site of La0.7Sr0.3MnO3 on the structural characteristics and electrochemical properties of the samples was specifically investigated. Among all the samples, La0.7Sr0.3MnO3Mg0.2O3-delta (LSMM20) showed larger BET surface areas (8.72 m(2)/g), a lower thermal expansion coefficient of -10.6 x 10(-6) K-1 in a temperature range of 50-900 degrees C and a higher oxygen vacancy concentration. The good electrochemical performance of LSMM20 was manifested from its lower polarization resistance (Rp), resulting in a maximum power density of 187 mW cm-2 for an electrolyte supported single cell at 800 degrees C. This study indicates the potential of LSMM20 as a cathode candidate material for IT-SOFCs. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：99 / 105
页数：7
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