A Study On Electrosynthesis Of 2,5-Dichlorophenol Using Titanium Anode Coated With Metallic Oxide

A conventional thermal decomposition method was used to prepare Sn-Ir electrodes modified with Sb-, Co-, and Ce-based oxides, which were applied to synthesize 2,5-dichlorophenol by the electro-oxidation of 1,4-dichlorobenzene. The morphology of the electrodes was investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) tests were employed to analyse the electrolysis experiment and electrocatalytic activity of the electrodes. The results showed that Sn-Ir electrodes doped with designated amounts of Sb, Co or Ce could compact the coating, and improve the stability of the electrode. Typically, Sn-Ir doped with 1% Ce had a good response in the LSV measurement, which yielded a 2,5-dichlorophenol concentration of 45% with a selectivity of 85%. The conversion rate of 1,4-dichlorobenzene was 53%, which indicated that the Sn-Ir-Ce electrode had a better catalytic activity.