کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1298757 1498371 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical behavior of ceria with selected metal electrodes
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Electrochemical behavior of ceria with selected metal electrodes
چکیده انگلیسی

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 °C) 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 179, Issues 21–26, 15 September 2008, Pages 1036–1041
نویسندگان
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