The film model for determining the effect of ionic migration in electrochemical systems期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

The film model for determining the effect of ionic migration in electrochemical systems

Authors:	J M Hornut G Valentin A Storck

Affiliation:	(1) Laboratoire des Sciences du Génie Chimique, CNRS-ENSIC, 1 rue Grandville, 54042 Nancy Cedex, France

Abstract:	The film model is used to examine the effect of ionic migration on the concentration of ionic species and on the electrolyte potential profiles inside the Nernst layer.A general analytical solution is obtained which allows the variation of the limiting current density with the total concentration of the species present in the electrolyte to be demonstrated. Two cases are considered depending on whether the product is soluble in the electrolyte or not. Specific examples are given for the reduction of cupric ions (cations) or ferricyanide ions (anions), respectively in H₂SO₄ and KOH electrolyte.Nomenclature C _j concentration of ionic species inside the diffusion layer - C _jo concentration of ionic species in the bulk - C _A,C _B concentration of the reactant and product inside the diffusion layer - D _j molecular diffusion coefficient - F Faraday's constant - i current density - n exponent ofD _j - i _L,i _L0 limiting current densities - r ratio $\frac{{C_{H^ + } }}{{2C_{{\text{SO}}_{\text{4}}^{{\text{2}} - } } }}{\text{ or }}\frac{{C_{{\text{OH}}^ - } }}{{C_{{\text{K}}^{\text{ + }} } }}$ - T temperature - r c _B0/c _A0 - t _j transport number - x normal coordinate - y $= \exp \left { - \frac{F}{{RT}}(\phi - \phi _\delta )} \right]$ as defined in Equation 36 - Z _j charge number of speciesj - z _AB mutual charge number defined in Equation 11 - z number of electrons involved in the reaction Greek letters diffusion layer thickness - electrical solution potential

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