Carbon-Based Cerium(III)-Doped Lead Dioxide Anode

Abstract

The electrocatalytic activity of cerium doped lead dioxide anode was investigated. The electrodes were prepared by electrodeposition of lead dioxide on the carbon based substrates from the bath comprising lead(II) nitrate 1.0 M and cerium(III) nitrate 0.1 M. Polarization studies of cerium doped lead dioxide electrodes were carried out using 1.0 mM iso-propanol at a scan rate of 100 mV/min in a three electrode system as shown in Figure 1. The electrooxidation of chromium(III) to chromium(VI) was also carried out using 0.3 mM chromium(III) solution and the cerium doped electrodes of area 30cm2 in divided cell. The electrolysis was run for 20 hours and the electrolyte was analyzed by visible spectroscopy. The electrochemical conversion of chromium(III) to chromium(VI) after electrolysis was 77.4% by passing 2.5 mF of charge.