The Investigation Of Chromate Reduction On Platinum Electrode

In this work the cathodic reduction of bichromate was investigated with a poten- tiostatic method to the hydrogen discharge potential. Current - potential curves were obtained both oxidized and reduced platinum electrodes. It was shown that the reduction of bichromate on platinum electrode occurs on the same reduction potential of metal oxide. Limiting current at the steps which are seen in the positive potential are propor- tional with bichromate in low concentration region. As concentration was increased these steps drift to the negative potential and limiting current decreased in the first step. In addition, hysteresis curves were otained in 1 N H2SO and acidic bichromate Solutions with reduced and oxidized platinum electrode. From these studies it was shown that the film formed on the electrode does not prevent the chromate reduction in acidic medium and changes its sturucture during cathodic reduction.