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测定了不同浓度的I_3溶液的微分电容曲线,发现曲线完全重合且和纯KI溶液的相同,故电极表面只特性吸附I~-离子,I_3~-+2e——3I~-反应中的一步是碘原子在电极表面获得电子。
The differential capacitance curve of I_3 solution with different concentrations was measured. It was found that the curves were completely coincident and the same as that of pure KI solution. Therefore, only the characteristic adsorption of I ~ - ions on the surface of the electrode was observed. One step in the reaction of I_3 ~ - + 2e ~ 3I ~ Iodine atoms acquire electrons on the electrode surface.