Electrochemical behavior of ceria with selected metal electrodes
The electrochemical properties of the metal | doped ceria | metal system have been examined by A.C. impedance spectroscopy at a range of temperatures (575-650℃) and oxygen partial pressures (8×10-26-0.21 atm). Under reducing conditions, the inverse of the interfacial resistances for both Pt and Au electrodes on samarium-doped ceria (SDC) displayed a po2-1/4 dependence on oxygen partial pressure and an Arrhenius dependence on temperature with an activation energy of ～2.7 eV. The similarity in the characteristics of the two types of electrode materials indicates that the electrochemical oxidation of hydrogen occurs predominantly at the ceria | gas interface. Moreover, the behavior, which is similar to that of the electronic conductivity of SDC, is consistent with the hypothesis that electron migration from the reaction site to the metal current collector is the rate-limiting step.
Electrode-electrolyte interface Electrochemical ozidation Ceria Mized conductors
William C.Chueh Wei Lai Sossina M.Haile
Materials Science, California Institute of Technology, 1200 E.California Boulevard M/C 309-81, Pasadena, CA 91125, USA
国际会议
The 16th International Conference on Solid State Ionics(第十六届国际固态离子学会议)
上海
英文
1036-1041
2007-07-01（万方平台首次上网日期，不代表论文的发表时间）