Degradation behavior under alternating constant-current/constant-voltage discharge for flat-tube solid oxide fuel cells inside stack

被引：4
作者：
Han, Beibei [1 ]
Tang, Yafei [1 ]
Wang, Jianxin [1 ]
Guan, Wanbing [1 ]
Singhal, Subhash C. [1 ]
机构：
[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Key Lab Adv Fuel Cells & Electrolyzers Technol Zhe, Ningbo 315201, Zhejiang, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2023年 / 48卷 / 46期
基金：
中国国家自然科学基金;
关键词：
Constant current; Constant voltage; DC discharge; Degradation; Solid oxide fuel cell; TEMPERATURE DISTRIBUTION; PERFORMANCE; SOFC; STABILITY; OPERATION; ELECTRODE;
D O I：
10.1016/j.ijhydene.2023.01.253
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：
An alternating constant-current (CC)/constant-voltage (CV) discharge for the optimal operation mode of solid oxide fuel cells (SOFCs) inside stack is carried out, and the degradation of SOFCs is discussed. The SOFCs are operated alternately in CC/CV mode for 985 h at 750 degrees C. The results show that the degradation rate of SOFCs first decreases and then increases in the CC/CV alternating operation mode. And the lowest degradation rate is 3.64%/100 h in the CV operation mode at similar to 0.85 V, which is about one order of magnitude higher than the average degradation rate (0.36%/100 h) in the corresponding CC operation mode. The EIS analysis indicates that the ohmic resistance increases and the polarization resistance decreases after the CV operation mode, while the impedance change after CC discharge shows the opposite trend. (c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：17654 / 17663
页数：10
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