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测定了室温下(20±1℃),H_2SO_4水溶液中I~-及I_2分别在F~-、C1~-、Br~-存在时,在Pt电极上的循环伏安图.I~-C1~-及I~-Br~-体系在0.2—1.0V(vs.SCE)范围内,都有两对基本可逆的氧化还原峰.第一对氧化还原峰的位置和峰高不随C1~-或Br~-.的浓度而变化,对应于反应:2I~-(?)I_2+2e;第二对氧化还原峰的位置随Cl~-或Br~-的浓度增加而负移,但峰高不变,浓度增大10倍,峰电势分别负移88±2mV和113±2mV,与由I_2-C1~-及I_2-Br~-体系在0.6-1.0V范围内得到的规律一致,对应的反应分别为I_2C1+3C1~-(?)2C1_2+2e和I_2+4Br_-(?)2IBr_2-+2e.F~-在该电势范围内不参与反应.
The cyclic voltammograms at Pt electrode of I ~ - and I_2 in the presence of F ~ -, Cl ~ -, Br ~ - were measured at room temperature (20 ± 1 ℃) - and I ~ -Br ~ ~ system have two pairs of redox peaks which are basically reversible in the range of 0.2-1.0 V (vs.SCE) .The position and peak height of the first pair of redox peaks do not change with C1 ~ - or Br ~ (·) I 2 + 2e; the position of the second pair of redox peaks shifts negatively with increasing concentration of Cl ~ - or Br ~ -, but the peak height remains the same , Respectively. The peak potentials were negatively shifted by 88 ± 2mV and 113 ± 2mV, respectively, which were consistent with those obtained by I_2-C1 ~ - and I_2-Br ~ - in the range of 0.6-1.0V. The corresponding responses were For I_2C1 + 3C1 ~ - (?) 2C1_2 + 2e and I_2 + 4Br _- (?) 2IBr_2- + 2e.F ~ - in this potential range does not participate in the reaction.