Ni Catalyst for Hydrogen Conversion in Gadolinia-Doped Ceria Anodes for Solid Oxide Fuel Cells
Ni Catalyst for Hydrogen Conversion in Gadolinia-Doped Ceria Anodes for Solid Oxide Fuel Cells
复制标题
用于固体氧化物燃料电池的氧化钆掺杂二氧化铈阳极中氢转化的镍催化剂
DOI：
--
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Y. L. Liu
中科院分区：
文献类型：
--
作者：
S. Primdahl;Y. L. Liu
本文研究了一种掺钆的铈ce0.6 Gd 0.4 o1.8 （CG4）作为固体氧化物燃料电池的负极材料。对称电池安装在一个新的设置几何与辅助电极，以避免浓度极化外的电极结构。用阻抗谱法测定了h2 / h2o混合物的极化电阻。观察到两个速率限制过程。低频过程与氢在CG4表面的吸附有关。添加少量的Ni可以有效地规避这一限制过程。高频过程与氧离子在CG4电极材料中的传输有关，无论是在整体中还是在分离的表面层中。CG4中电子电导率对pO 2的依赖性反映在串联电阻上。
A gadolinia-doped ceria Ce 0.6 Gd 0.4 O 1.8 (CG4) is considered as anode material for solid oxide fuel cells with an yttria-stabilized zirconia electrolyte. Symmetrical cells are mounted in a novel setup geometry with auxiliary electrodes to avoid concentration polarization outside the electrode structure. The polarization resistance in H 2 /H 2 O mixtures is measured by impedance spectroscopy. Two rate-limiting processes are observed. The low frequency process is related to adsorption of hydrogen on the CG4 surface. This limiting process is effectively circumvented by the addition of small amounts of Ni. The high frequency process is related to oxygen ion transport in the CG4 electrode material, either in the bulk or in segregated surface layers. The pO 2 dependence of the electronic conductivity in CG4 is reflected in the series resistance.