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이산화망간전극에 의한 요오드이온의 양극산화
Anodic Oxidation of Iodide on Manganese Dioxide Electrode
HWAHAK KONGHAK, February 1989, 27(1), 70-77(8), NONE
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Abstract
열분해법으로 제작한 Ti/RuO2/MnO2 전극을 사용하여 산성용액중에서 요오드화칼륨에 대한 cyclic voltammogram 및 전류-전위 곡선을 측정하고 요오드이온의 산화에 의한 요오드산이온의 생성반응 내용을 검토하였다. 요오드이온은 가역적인 제 1단계 전극반응을 통하여 요오드로 산화되며 요오드는 비가역적인 제 2단계 전극반응에 의하여 요오드산이온으로 산화된다. 각 단계의 전극반응은 확산지배과정으로 제 1단계 반응은 제 2단계 반응에 비하여 상대적으로 빠르게 진행된다. 산성하에서 요오드의 생성반응은 pH에 거의 무관하며 요오드산이온의 생성반응는 pH가 증가함에 따라 느리게 진행되는 것으로 나타났다.
A study on the formation of iodate produced by oxidation of iodide was performed with cyclic voltam-metry and polarization curve measurement in acidic media on the Ti/RuO2/MnO2 electrode prepared by thermal de-composition method. Iodide is oxidized to iodine by the first reversible electrode reaction and then iodine is oxidized to iodate by the se-cond irreversible electrode reaction. Each step of electrode reaction is controlled by diffusion and the reaction rate of the first step is relatively faster than the second step. The effect of pH on formation of iodine is negligible and the reaction rate of the second step is become slow accor-ding to pH increase in acidic media.
