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本文用薄层光谱电化学技术研究了 Ag(IO_6)_2~(7-)在金微栅电极上阴极还原的机理,认为 Ag(Ⅲ)首先转移两个电子还原至 Ag(Ⅰ),然后 Ag(Ⅰ)继续还原至 Ag(0)。测定了不同 PH 条件下 Ag(Ⅲ)/Ag(Ⅰ)的 E~(0′),给出了 E~(0′)与 PH 的关系式,并由此得到了在碱性介质中 Ag(Ⅲ)/Ag(Ⅰ)的标准电极电势E~0=0.407V(VS.SCE)。
In this paper, the mechanism of cathodic reduction of Ag (IO_6) _2 ~ (7-) on gold micro-grid electrode is studied by means of thin-layer spectrochemical technique. It is considered that Ag (Ⅲ) firstly transfers two electrons to Ag (Ⅰ) (I) continue to restore to Ag (0). The E ~ (0 ’) of Ag (Ⅲ) / Ag (Ⅰ) under different pH conditions was measured and the relation between E ~ (0’) and pH was given. Ⅲ) / Ag (Ⅰ) standard electrode potential E ~ 0 = 0.407V (VS.SCE).