Original title: Voltage-step Transient in Redox Systems II. 1D Approximation (revisited)
Authors: Wein, Ondřej
Document type: Research reports
Year: 2010
Language: eng
Series: 6
Abstract: Using the well-known Cottrell asymptote, voltage-step transient experiment could provide data on bulk concentration and diffusion coefficient of working depolarizer, essential in the liming-current techniques. However, the Cottrell asymptote is not directly applicable in an early stage of the voltage-step transient process,. There are three additional transport resistances that cannot be neglected at extremely high initial currents: Faradaic resistance at surface of working electrode, Ohmic losses in its intimate neighborhood, and the galvanometric constraint in the outer circuit (galvanometer, current follower, potentiostat). Non-linear effect of these additional transport resistances on the transient current is calculated in a 1D approximation, i.e. assuming uniform accessibility of the working electrode, for finite voltage steps.
Keywords: cottrell asymptote; ohmic loss; voltage-step transient
Project no.: CEZ:AV0Z40720504 (CEP), GA104/08/0428 (CEP)
Funding provider: GA ČR

Institution: Institute of Chemical Process Fundamentals AS ČR (web)
Original record: http://hdl.handle.net/11104/0187543

Permalink: http://www.nusl.cz/ntk/nusl-42707


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