کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6604815 1424098 2018 22 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Exchange current density of Gd(III)/Gd reaction in LiCl-KCl eutectic and analysis of errors caused by various methods
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Exchange current density of Gd(III)/Gd reaction in LiCl-KCl eutectic and analysis of errors caused by various methods
چکیده انگلیسی
Reliable measurement of exchange current density i0 is important for systems using molten salts as electrolyte or/and coolant. The values of i0 of Gd(III)/Gd reaction in LiCl-KCl eutectic at different GdCl3 concentrations (1-9 wt%) and temperatures (723-823 K) are reported. The values are determined by optimization fitting method using the non-simplified electrode kinetics equation, and other three commonly used methods including Tafel method, linear polarization (LP) method, and electrochemical impedance spectroscopy (EIS) method. Results show that significant errors can be introduced by using the three conventional methods in the mass-transfer involved case as they are based on the simplified electrode kinetics equations with an assumption of no mass-transfer effect. The optimization fitting method shows more reliable results but has limitations at 1 wt% Gd concentration. The standard rate constant k0 values determined by the optimization fitting are 4.93-9.13 × 10−5 cm/s in the studied temperature range and the activation energy is 30.5 kJ/mol.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 259, 1 January 2018, Pages 253-261
نویسندگان
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