Chromium poisoning effect on strontium-doped samarium manganite for solid oxide fuel cell

被引：6
|
作者：
Xiong, Chunyan [1 ]
Li, Wenlu [2 ]
Ding, Dong [3 ]
Pu, Jian [1 ]
Chi, Bo [1 ]
Li, Jian [1 ,4 ]
机构：
[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Sch Mat Sci & Engn, Ctr Fuel Cell Innovat, Wuhan 430074, Hubei, Peoples R China
[2] Wuhan Univ Technol, Int Sch Mat Sci & Engn, Wuhan, Hubei, Peoples R China
[3] Idaho Natl Lab, POB 1625,MS 3732, Idaho Falls, ID 83415 USA
[4] Huazhong Univ Sci & Technol Shenzhen, Res Inst, Shenzhen 518000, Guangdong, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2016年 / 41卷 / 45期
基金：
中国国家自然科学基金;
关键词：
Solid oxide fuel cell; Cathode; Chromium poisoning; Durability; Strontium-doped samarium manganite; OXYGEN REDUCTION REACTION; LAMNO3; ELECTRODES; CATHODE MATERIALS; TEMPERATURE; DEPOSITION; NONSTOICHIOMETRY; INTERCONNECT; ALLOY;
D O I：
10.1016/j.ijhydene.2016.07.061
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：
Strontium-doped samarium manganite is a potential cathode for solid oxide fuel cells (SOFCs) with remarkable high oxygen reduction reaction activity. Here we investigated chromium poisoning effect on Sm0.5Sr0.5MnO3 cathode of SOFCs for the first time. The Cr caused cathode degradation is studied under current density of 200 mA cm(-2) and open circuit potential (OCP) at 750 degrees C. After polarized in the presence of the Crofer22 APU at 750 degrees C for 1200 min, the polarization resistance decreases from 3.25 Omega cm(2) to 2.25 Omega cm(2), then increases to a stable value of 2.75 Omega cm(2). The degradation rate of SSM is lower than that of LSM cathode in the same experimental environment. At OCP, the polarization resistance increases to 7.00 Omega cm(2) and reaches a stable level. SEM and EDX shows the depositions on the Sm0.5Sr0.5MnO3 boundary after applying current for 1200 min, and on the SSM surface after aging at OCP for 200 h. The Cr depositions are mainly comprised of SrCrO4 formed by the nucleation reaction. The results show that SSM is a poisoning tolerant cathode and good replacement for the LSM in IT-SOFCs due to the better electrochemical performance and the relatively stable characteristics after Cr poisoning. (C) 2016 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
引用
收藏
页码：20660 / 20669
页数：10
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