Copper doped lanthanum strontium ferrite for reduced temperature solid oxide fuel cells

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• 作者：Coffey ; Greg ; Hardy ; John ; Marina ; Olga ; Pederson ; Larry ; Rieke ; Peter ; Thomsen ; Ed
• 关键词：Lanthanum strontium ferrite ; Copper ; Solid oxide fuel cell
• 刊名：Solid State Ionics
• 出版年：2004
• 期刊代码：96_01672738
• 类别：ch
• 出版时间：November 30, 2004
• 卷：175
• 期：1-4
• 页码：73-78
• 文件大小：368 K

摘要

Copper doped lanthanum strontium ferrite showed superior kinetics for the electro-reduction of oxygen. The generic formulation was La_1芒芒芒xSr_xCu_1芒芒芒yFe_yO₃ (LSCuF) where x ranged from 0.2 to 0.3 and y varied from 0 to 0.4. Doping with copper improved the electrocatalytic activity compared with undoped material. In oxygen, the La_0.7Sr_0.3Cu_0.2Fe_0.8O₃ sample showed current densities approximately 2芒芒芒3 times that of La_0.7Sr_0.3FeO₃ and 10 times that of La_0.8Sr_0.2FeO₃. This improvement was confirmed with cyclic voltammetric studies on half cells and on full fuel cell tests. Copper doped materials have unusual electrochemical characteristics and copper apparently undergoes a one electron reduction at overpotentials less than 芒芒芒0.1 V. This occurred only in air but not in oxygen.