【摘要】 从CeO2 所属的萤石型氧化物结构特点出发 ,对CeO2 内部的电子缺陷、氧离子及其空穴等在催化氧化中的作用进行分析 ,指出CeO2 在氧化催化剂中所起的修饰作用与它的价态变化———Ce4+ /Ce3 + 间的转换 ,以及CeO2 与Cu等过渡金属之间的相互作用密切相关。更重要的是 ,此类催化体系 (如Cu CeO2 )是具有较高的电子 离子混合导电能力的混合型导体 ,且CeO2 易于存储、传输氧 ,可以协助O2 -从电解质向阳极传递 ,将阳极氧化反应面扩大至TPB面以外 ,减小界面阻力 ,加快氧化反应速率。此特性使其在以甲烷为燃料的固体电解质燃料电池阳极开发领域成为一种值得关注的备选材料。更多还原

【Abstract】 The fluorite structure characteristics of ceria were demonstrated. The function of electronic defect, oxide ion and its vacancies in ceria in catalytic oxidation was analyzed. The results show that the promoting effect of ceria in oxidation catalysts has closely connection with its variable valence between Ce 4+ and Ce 3+ , as well as the metal support interaction of ceria with transition metals such as copper. The catalytic systems, such as Cu ceria catalysts, with high electronic and ionic conductivity, are bound to be a promising anode material in solid oxide fuel cells fed on methane. Furthermore, ceria is prone to store and transfer oxygen, promote oxide ionic transference from electrolyte to anode, extend the anodic reaction area outside TPB, decrease the interface resistance between electrolyte and anode, and increase oxidation reaction rate.更多还原