The effects of homocysteine protonation on double layer parameters at the electrode/chlorates (VII) interface, as well as the kinetics and the mechanism of Bi (III) ion electroreduction

Abstract

The influence of homocysteine on double layer parameters at the electrode/chlorates (VII) interface and multi-step Bi (III) ion electroreduction was investigated using both voltammetry and impedance methods. The catalytic activity of homocysteine increases with an increasing amount of NaClO4 in a basic electrolyte solution. The highest catalytic activity of homocysteine was observed for 2mol·dm−3 chlorates (VII). The multistage process is confirmed by the not rectilinear lnkf=f(E) dependences. In this mechanism, the chemical stages of Bi–Hg(SR)2 complexes formation with the participation of homocysteine, which is a mediator in the formation of these complexes, and water can be distinguished. The composition of these complexes is diversified in solutions that differ in the degree of amino acid protonation.