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Voltage-step Transient in Redox Systems II. 1D Approximation (revisited)

  1. 1.
    0346534 - ÚCHP 2012 RIV CZ eng V - Výzkumná zpráva
    Wein, Ondřej
    Voltage-step Transient in Redox Systems II. 1D Approximation (revisited).
    Praha: Ústav chemických procesů AV ČR, v. v. i, 2010. 17 s. 6.
    Grant CEP: GA ČR GA104/08/0428
    Výzkumný záměr: CEZ:AV0Z40720504
    Klíčová slova: voltage-step transient * cottrell asymptote * ohmic loss
    Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství

    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.
    Trvalý link: http://hdl.handle.net/11104/0187543

     
     
Počet záznamů: 1  

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