کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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196622 | 459847 | 2006 | 11 صفحه PDF | دانلود رایگان |

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.
Journal: Electrochimica Acta - Volume 51, Issue 14, 15 March 2006, Pages 2851–2861