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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/44429

    Title: A kinetic model for the anodic dissolution of zinc in alkaline electrolyte with sodium metasilicate additions
    Authors: 張裕祺;Chang, Yu-chi
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: zinc;anodic dissolution;silicate;kinetic model
    Date: 1996-01
    Issue Date: 2010-03-09 10:20:46 (UTC+8)
    Publisher: Elsevier
    Abstract: The anodic dissolution of zinc electrodes in potassium hydroxide solutions containing sodium metasilicate has been investigated experimentally and theoretically in this study. On the basis of the experimental r̀esults, a kinetic model based on a competitive chemisorption approach has been developed and tested. The steady-state dissolution of zinc electrodes in the above-mentioned system has been measured using rotating disc electrode techniques. Good agreement is obtained between the model and the experimental results. The activation energy for the system is close to that for a kinetically controlled mode. This suggests that a surface reaction is rate limiting during the electro-dissolution process. It has been shown that the increase in the Tafel slope for the above-mentioned system in the active dissolution region is due to the adsorption of silicate on the electrode surface. A modified Langmuir model has been found to work reasonably well for the system studied. A change in the reaction order with respect to hydroxide ion has been found experimentally and predicted by the model also.
    Relation: Electrochimica Acta 41(15), pp.2425-2432
    DOI: 10.1016/0013-4686(96)00029-1
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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