Thermal stability study of SDC/Na2CO3 nanocomposite electrolyte for low-temperature SOFCs

被引：75
作者：
Ma, Ying [2 ,3 ]
Wang, Xiaodi [2 ,3 ]
Raza, Rizwan [1 ]
Muhammed, Mamoun [2 ]
Zhu, Bin [1 ,3 ]
机构：
[1] Royal Inst Technol KTH, Dept Energy Technol, S-10044 Stockholm, Sweden
[2] Royal Inst Technol KTH, Div Funct Mat, S-16440 Stockholm, Sweden
[3] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Harbin 150001, Peoples R China
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2010年 / 35卷 / 07期
关键词：
Ce0.8Sm0.2O1.9 (SDC); Composite electrolyte; Thermal stability; Solid oxide fuel cells (SOFCs); NANOSTRUCTURED MATERIALS; COMPOSITE ELECTROLYTE; ELECTRICAL-CONDUCTIVITY; NANOCRYSTALLINE CERIA; IONIC TRANSPORT; FUEL-CELL; PERFORMANCE; MICROSTRUCTURE; NANOPARTICLES; STORAGE;
D O I：
10.1016/j.ijhydene.2009.03.052
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：
The novel core-shell nanostructured SDC/Na2CO3 composite has been demonstrated as a promising electrolyte material for low-temperature SOFCs. However, as a nanostructured material, stability might be doubted under elevated temperature due to their high surface energy. So in order to study the thermal stability of SDC/Na2CO3 nanocomposite, XRD, BET, SEM and TGA characterizations were carried on after annealing samples at various temperatures. Crystallite sizes, BET surface areas, and SEM results indicated that the SDC/Na2CO3 nanocomposite possesses better thermal stability on nanostructure than pure SDC till 700 degrees C. TGA analysis verified that Na2CO3 phase exists steadily in the SDC/Na2CO3 composite. The performance and durability of SOFCs based on SDC/Na2CO3 electrolyte were also investigated. The cell delivered a maximum power density of 0.78 W cm(-2) at 550 degrees C and a steady output of about 0.62 W cm(-2) over 12 h operation. The high performances together with notable thermal stability make the SDC/Na2CO3 nanocomposite as a potential electrolyte material for long-term SOFCs that operate at 500-600 degrees C. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：2580 / 2585
页数：6
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