کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1269755 1497401 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermodynamic prediction of the effect of CO2 to the stability of (La0.8Sr0.2)0.98MnO3±δ system
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Thermodynamic prediction of the effect of CO2 to the stability of (La0.8Sr0.2)0.98MnO3±δ system
چکیده انگلیسی


• Formation of secondary phases on LSM surface and LSM/YSZ interface were predicted.
• Phase stability changes due to the exposure of CO2 to the system.
• SrCO3 forms as a result of reaction between LSM and CO2.
• Electrical conductivity drop is predicted to occur because of the formation of secondary phases.

Thermodynamic predictions regarding the formation of secondary phases in CO2 containing atmosphere on the (La0.8Sr0.2)0.98MnO3±δ (LSM-20) surface and at the LSM-20 (cathode)/8YSZ (electrolyte) interface have been studied using the CALculation of Phase Diagram (CALPHAD) approach. The effects of temperature, CO2 partial pressure, O2 partial pressure and the cathode composition on formation of secondary phases have been investigated and correlated with the available experimental results found in the literature. Our study predicts that the SrCO3 has the possibility to form on the surface and at triple phase boundaries (TPBs) as a result of CO2 exposure to the system. In addition, our study also indicates that the CO2 exposure does not change the electronic/ionic carriers' concentration in perovskite phase. The observed electrical conductivity drop is predicted to occur due to the formation of secondary phases such as LaZr2O7, SrZrO3 or SrCO3, at the LSM-20/8YSZ interface, resulting in the blocking of the electron/ion transfer paths.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 41, Issue 24, 29 June 2016, Pages 10239–10248
نویسندگان
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