کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
196622 459847 2006 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Theoretical study of a catalytic mechanism using cyclic and derivative chronopotentiometric techniques with spherical electrodes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Theoretical study of a catalytic mechanism using cyclic and derivative chronopotentiometric techniques with spherical electrodes
چکیده انگلیسی

A general analytical solution for a pseudo-first order catalytic process in chronopotentiometric techniques (reversal chronopotentiometry, cyclic chronopotentiometry and reciprocal derivative chronopotentiometry) when using spherical electrodes of any size is presented. The evolution from transient to stationary potential–time responses, characterized by the disappearance of the periodical signal in the neighbourhood of the steady state, is analyzed in cyclic and reversal chronopotentiometry. From reversal potential–time responses, the reciprocal derivative dt1/2/dE–E curves – which are more sensitive than traditional dt/dE–E curves – have been obtained. The characteristic peaks presented by the dt1/2/dE–E curves are quantitatively related to the rate constants of the chemical reaction and show a very different behaviour in catalytic and EC processes, allowing the easy discrimination between both mechanisms. Several types of working curves have been proposed to obtain the rate constants of the chemical reaction in a catalytic process.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 51, Issue 14, 15 March 2006, Pages 2851–2861
نویسندگان
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