Electrochemical performance of La2Cu1-xCoxO4 cathode materials for intermediate-temperature SOFCs

被引:31
作者
Li, Qiang [1 ]
Zeng, Xu [1 ]
Sun, Liping [1 ]
Zhao, Hui [1 ]
Huo, Lihua [1 ]
Grenier, Jean-Claude [2 ]
机构
[1] Heilongjiang Univ, Minist Educ Harbin, Key Lab Funct Inorgan Mat Chem, Harbin 150080, Peoples R China
[2] Univ Bordeaux 1, ICMC Bordeaux CNRS, F-33608 Bordeaux, France
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Intermediate temperature solid oxide fuel cells; La2Cu1-xCoxO4 cathode material; Electrochemical properties; OXIDE FUEL-CELLS; ELECTRODE PROPERTIES; ION-TRANSPORT; IMPEDANCE; BEHAVIOR; YSZ;
D O I
10.1016/j.ijhydene.2011.11.014
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
K2NiF4-type structure oxides La2Cu1-xCoxO4 (x = 0.1, 0.2, 0.3) are synthesized and evaluated as cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). The materials are characterized by XRD, SEM and electrochemical impedance spectrum (EIS), respectively. The results show that no reaction occurs between La2Cu1-xCoxO4 electrode and Ce0.9Gd0.1O1.95 (CGO) electrolyte at 1000 degrees C. The electrode forms good contact with the electrolyte after sintering at 800 degrees C for 4 h in air. The electrode properties of La2Cu1-xCoxO4 are studied under various temperatures and oxygen partial pressures. The optimum composition of La2Cu0.8Co0.2O4 results in 0.51 Omega cm(2) polarization resistance (R-p) at 700 degrees C in air. The rate limiting step for oxygen reduction reaction (ORR) is the charge transfer process. La2Cu0.8Co0.2O4 cathode exhibits the lowest overpotential of about 50 mV at a current density of 48 mA cm(-2) at 700 degrees C in air. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:2552 / 2558
页数:7
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