Die kinetik der zinkelektrode in wässrigen malonatlösungen

On a Model for the Electrocrystallization of Zinc Involving an Autocatalytic Step

“…Electrode impedance.--The faradaic impedance Zf of the electrode is calculated using a method described elsewhere (27) which consists in linearizing Eq. [1]- [4] for small sinusoidal variations AV : IAV[eJ~t from conditions for steady state. We thus obtain Eq.…”

“…According to certain authors (1), the adatoms resulting from the simultaneous transfer of two electrons diffuse on the surface before being incorporated into the crystal lattice. Other authors (2)(3)(4)(5) believe on the contrary that charge transfer occurs from the bivalent metal ion Zn +2, which can either be solvated or form a complex in the electrolyte, in two successive monoelectronic steps involving a monovalent intermediate Zn + which can also form complexes with certain anions (4,5) Zn 2 + + e--> Zn +…”

Reply to “Comments on the paper entitled ‘The formulation and modelling of the anodic dissolution of zinc through adsorbed intermediates’” by C. Cachet et al.

“….the consistency of these models in terms of charge balance and conservation of the fluxes of electrical charges across the whole cell was never questioned.' ' We analysed most of the articles cited above [5][6][7][8][9][10][11], and we arrived at the conclusion that in contrast to the statement of the Authors of Ref. [1] there is a characteristic difference between the reaction schemes criticized by us and those reported in most of the papers which were considered as a support for the views of the authors of Refs.…”

“…It should be noted, that although in the scheme presented in [6] the formal step Zn ¢ Zn þ ad þ e can be found, however, as it is stressed in the paper, in this model this reaction is assumed to be directly linked with a fast adsorption reaction of anions from the solution.…”

Comments on the paper entitled ‘The formulation and modelling of the anodic dissolution of zinc through adsorbed intermediates’by G.G. Láng, and G. Horányi [J. Electroanal. Chem. 583 (2005) 148–154]

“…This kind of models has been published in the last decades by many electrochemists. Among the most well-known are Bockris [11][12][13], Heusler [14], the groups of Thirsk in UK [15,16], É pelboin in France [17,18], Lorenz in Germany [19,20] regardless of the techniques used, electrochemical impedance spectroscopy (EIS) or polarisation curves. Of course, these works have been the object of a series of controversies, dealing mainly with their speculative aspects with respect to the chemical nature of the adsorbed species, type of isotherms.…”