Electrocatalysis of Dihydroxybenzene at Gold Nanoparticles Modified Glassy Carbon Electrode and its Analytical Application

An AuNP-GCE was prepared by constant potential deposition of gold nanoparticles(AuNP) on the glassy carbon electrode(GCE) through direct reduction of HAuCl4.The electrochemical behaviors for single solute and mixed systems of dihydroxybenzene isomers on the AuNP-GCE are investigated in PBS buffer solution(pH7.0) with cyclic votammetry technique.The results show that the AuNP-GCE exhibited different electrocatalytic effect toward isomers of dihydroxybenzene.Well-shaped redox peaks were observed on the AuNP-GCE by hydroquinone and catechol and no redox peak by resorcinol.In comparison with redox peaks,hydroquinone and catechol on the AuNP-GCE can be obviously distinguished in the mixed systems of isomers.Therefore,a novel method for simultaneous determination of hydroquinone and catechol in the mixed systems of isomers was satisfactorily established.