浓碱溶液中生成高铁酸盐的玻碳电极循环伏安法表征(英文)

用玻碳电极研究了与Fe(Ⅵ)／Fe(Ⅲ)电对氧化还原有关的循环伏安曲线.所研究的体系是13mol·L-1NaOH中浓度范围分别为0.015～0.06mol·L-1的Na2FeO4和0.01～0.025mol·L-1的NaFeO2溶液。另一类研究体系是胶体石墨分别与固体K2FeO4、固体KFeO2组成的混合物,将这些混合物粘附于玻碳电极表面后在13mol·L-1KOH中进行循环伏安曲线的测定。结果证明了峰电位在0.7～1.0V的阳极电流峰与峰电位在0.15～0.2V(均相对于13mol·L-1NaOH或13mol·L-1KOH溶液中的Hg／HgO参比电极)的阴极电流峰,分别与高铁酸盐的生成与还原相对应。确定了将高铁酸盐的阳极生成电流峰与阳极析氧电流峰区别开来的条件。

Indication of Ferrate(Ⅵ) Formation by Cyclic Voltammetry at Glassy Carbon Electrode in Concentrated Alkaline Solution

Cyclic voltammetry (CV) curves for the redox couple of Fe( Ⅵ)/Fe(Ⅲ) were measured using stationary glassy carbon (GC) electrode. The solutions of Na2FeO4 and NaFeO2 in concentration mixtures of solid K2 FeO4 or solid KFeO2 and colloidal graphite, adhered to the surface of the GC elecspond to the formation and to the reduction of Fe(Ⅵ) respectively. The experimental conditions for separating the anodic current corresponding to the formation of Fe(Ⅵ) and that to the evolution of oxygen were determined.