Kinetics of electrooxidation of phenol on polycrystalline platinum

Abstract

This work reports on kinetics of phenol electrooxidation reaction (PhER), examined at polycrystalline Pt electrode in 0.5 M H 2 SO 4 and 0.1 M NaOH supporting solutions. Important aspects of PhER kinetics were analysed based on potential-dependent, a.c. impedance-derived values of charge-transfer resistance and capacitance parameters. Special attention was also given to the infl uence of supporting electrolyte ions on the process of phenol oxidation (pH dependence of the PhER), in relation to an important role of anion adsorption on the Pt catalyst surface.

Reactivity of carbon black diamond electrode during the electro-oxidation of Remazol Brilliant Blue R

“…This result conrms the result of cyclic voltammetry in PART 3.2.1. Charge transfer resistance values were reduced at applied potential higher than 1.3 V as the potential was close to oxygen evolution potential, particularly at 1.9 V. 54 Moreover, Table 1 depicts that the value of charge transfer resistance is higher than adsorption resistance, which means, the charge transfer resistance dominated the electrode kinetics under experimental condition. 55 With the same procedure, the oxidation potential of RBBR on 5CBD electrode in an aqueous solution of 0.25 M Na 2 SO 4 (pH 6.5) and 0.25 M KOH (pH 11) had been measured.…”