The Investigation Of Chromate Reduction On Platinum Eleçtrode In Basic Media

The current-potential curves obtained by potentiostatic methods revealed that bichromate reduction in NaOH solution with oxidized and reduced platinum electrodes took place at the reduction potantial of the eleçtrode metal oxide. It was found that the chromate reduction was restricted to a narrow concentration and potential range when using an oxidised platinum eleçtrode,where as the range was considerably extended when the reduced electrodes were used. According to the magnitude of the slopes of the lines that show the dependence of the limiting current to the bichromate concentration, the same reduction processes take place in a definite potential region in acidic and basic media. In this study, a new potential step at around 0.6 V that corresponds to theequilibrium potential of Cr2O7=/ Cr3+ is found