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我们曾论证过在烟酸氨性光亮镀银溶液内Ag(I)主要是Ag(NH_3)+2,而在电极表面是以Ag(C_6H_4NO_2)_2-放电,这说明必然存在前置化学反应,它可能是均相或是异相。本文用计时电位法和测量旋转园盘电极上极化曲线的实验否定了均相前置化学反应的存在,因此得出异相前置化学反应必然在存的结论。从对旋转圆盘电极上极化曲线的分析更进一步论证了以上的结论。文中还讨论了异相前置学化反应的存在对整个电极过程的影响。
We have demonstrated that Ag (I) is mainly Ag (NH 3) +2 in the bright silver nicotinic acid solution and Ag (C 6 H 4 NO 2) 2 - is discharged on the surface of the electrode, indicating the presence of pre-chemical reaction, It may be homogeneous or out of phase. In this paper, the chronopotentiometric method and the experiment of measuring the polarization curves on the rotating disk electrode denied the existence of homogeneous pre-chemical reaction, and concluded that the heterogeneous pre-chemical reaction must exist. From the analysis of the polarization curve on the rotating disk electrode, the above conclusion is further demonstrated. The paper also discusses the influence of the existence of heterophasic presynchronization reaction on the whole electrode process.