Electrocatalytic Hydrogenation of 4-Chlorophenol on the Glassy Carbon Electrode Modified by Composite Polypyrrole/Palladium Film

摘要

A polypyrrole/palladium composite film was prepared on a glassy carbon electrode by the electrochemical deposition method.The palladium particles were uniformly dispersed on a polypyrrole film that was previously electrodeposited on a glassy carbon electrode.By controlling the polymerization process of pyrrole,a highly porous polypyrrole film was obtained;this kind of structure provided more surface areas for depositing palladium particles.The sizes of Pd particles deposited on the porous polypyrrole film are about 15-30 nm.The X-ray photoelectron spectroscopy results showed there was strong interaction between polypyrrole film and palladium particles.This modified electrode showed excellent current efficiency (49.5%) for electrochemical hydrogenation of 4-chlorophenol and the phenol was the sole product.The potential effect on the dechlorination process was also investigated.