4.4 Article

Ceramic-based Anode Materials for Improved Redox Cycling of Solid Oxide Fuel Cells

期刊

FUEL CELLS
卷 8, 期 5, 页码 283-293

出版社

WILEY-BLACKWELL
DOI: 10.1002/fuce.200800018

关键词

Anode; Chemical Expansion; Electrical Conductivity; Perovskite; Redox Stability; Thermal Expansion

资金

  1. Marie Curie International Fellowship [MIF1-CT-2004-509999]
  2. European Community

向作者/读者索取更多资源

In order to improve the reliability of anode-supported solid oxide fuel cells (SOFCs) in terms of tolerance to redox cycles, and to minimise fuel preprocessing for the direct use of readily available hydrocarbons in SOFCs, alternative ceramic-based anode substrate materials and functional anode materials were investigated, with the emphasis on perovskite oxides. Compared to (Sr,La)TiO(3-delta) and Nb(2)TiO(7-delta), (Sr,Y)TiO(3-delta) ceramics (SYT, with a Y content of about 7 at.-%) reduced at high temperatures are promising redox-stable anode substrate materials due to their very small dimensional change upon redox cycling (0.14%). Correspondingly, the composite ceramic SYT/YSZ impregnated with similar to 5 vol.-% Ni has a good chance of being applied as a redox-stable functional anode material due to its even smaller dimensional change upon redox cycling (<0.05%) and superior electrochemical performance for H(2) oxidation (polarisation resistance similar to 0.2 Omega cm(2) at 800 degrees C). The small fraction of Ni homogeneously dispersed on the pore walls of the SYT/YSZ ceramic framework significantly enhances the electrocatalytic activity, and should not have a detrimental effect on the redox stability of the electrode. In addition, two mixed conductors with perovskite structure, (La(0.8)Sr(0.2))(0.94)Al(0.5)Mn(0.5)O(3-delta) and La(0.4)Sr(0.6)Ti(0.4)Mn(0.6)O(3-delta), were also investigated. They show promising electrochemical performance for the oxidation of H(2). However, the high-level Mn substitution which seems necessary to achieve a significant electrical conductivity and catalytic activity has a detrimental effect on the chemical stability of these two materials. Consequently, they show relatively large and irreversible chemical expansion and are thus not considered to be qualified functional anode materials.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.4
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据