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research-article

A fundamental study on the chemical stability of La1-xSrxCo0.2Fe0.8O3-d cathodes for intermediate temperature solid oxide fuel cells

[+] Author and Article Information
Yufeng Qiu

Center for Fuel Cell Innovation, School of Materials Science and Engineering, State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
qiuyufengcool@163.com

Jian Pu

Center for Fuel Cell Innovation, School of Materials Science and Engineering, State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
pujian@hust.edu.cn

Jian Li

Center for Fuel Cell Innovation, School of Materials Science and Engineering, State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
lijian@hust.edu.cn

Yihui Liu

Hubei Key Laboratory of Advanced Technology for Automotive Components & Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan 430070, China
liuyihui@whut.edu.cn

Bin Hua

Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
bhua1@ualberta.ca

1Corresponding author.

ASME doi:10.1115/1.4036812 History: Received January 14, 2017; Revised April 06, 2017

Abstract

The chemical stability of La1-xSrxCo0.2Fe0.8O3-d (x=0, 0.4, 0.6, 1) oxides before and after annealing at 750 °C in air is investigated by field emission scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), auger electron spectroscopy (AES) and environmental transmission electron microscopy (TEM). Results indicate that Sr surface segregation has initially occurred at the sintering stage, and then the secondary-phase particles are formed with increasing time during annealing at 750 °C in air. Increasing Sr content accelerates Sr segregation on the surface, because of two driving forces including elastic/electrostatic stresses in the crystal lattice and thermal activation. AES and XPS results reveal that Sr and Co segregations toward the surface have great contributions to the chemical instability of LSCF related to annealing.

Copyright (c) 2017 by ASME
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