کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
221227 463380 2007 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Alteration of diffusional transport by migration and natural convection. Theoretical and direct experimental evidences upon monitoring steady-state concentration profiles at planar electrodes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Alteration of diffusional transport by migration and natural convection. Theoretical and direct experimental evidences upon monitoring steady-state concentration profiles at planar electrodes
چکیده انگلیسی

The mapping of steady-state diffusion layers in the vicinity of planar electrodes was investigated in presence of an excess and default of supporting electrolyte. The concentration profiles were fully characterized using an ultramicroelectrode as an amperometric probe placed at several positions inside the diffusion layer. The dual influence of migration and convection on mass transport of electroactive species was evidenced experimentally through the study of a few one-electron electrochemical reactions. The specific distribution of the supporting electrolyte at the electrode interface was also performed upon detecting its cation purposely labelled by an electroactive group. The theoretical concentration profiles were evaluated on the basis of a model previously developed to account for the influence of natural convection on the building-up of diffusion layers. The agreement observed between data for the electrochemical reactions investigated validates a posteriori all the assumptions required to establish theoretically and experimentally the concentration profiles in default of supporting electrolyte.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Electroanalytical Chemistry - Volume 601, Issues 1–2, 15 March 2007, Pages 17–28
نویسندگان
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