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Electrochemical oxidation of glucose at Hg adatom-modified Au electrode in alkaline aqueous solution
Affiliation:1. Departamento de Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Asunción, 2189 Campus Universitario San Lorenzo, Paraguay;2. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, 1900 La Plata, Argentina;1. School of Public Health, Nanchang University, Nanchang 330006, PR China;2. Institute of Quality Standard and Testing Technology, Yunnan Academy of Agriculture Science, 650223 Kunming, PR China;1. School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China;2. Department of Chemistry, Lanzhou University, Lanzhou, Gansu 730000, China;1. State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Xiamen University, Xiamen 361005, China;2. Southwest University. School of Chemistry and Chemical Engineering. Chongqing 400715, China
Abstract:Electrochemical oxidation of glucose at Hg adatom-modified Au polycrystalline electrode was examined in alkaline aqueous solutions using cyclic voltammetry. Two oxidation current peaks for glucose were observed on Hg adatom-modified Au electrode at almost the same potentials as those observed on a bare Au electrode. The oxidation peak currents were much larger than those on a bare Au electrode in the concentration range from 0.5 to 20 mM. The observed enhancement of the glucose oxidation was considered to be due to the increase in the amount of the adsorbed OH on the Hg adatom-modified Au electrode. The reaction was catalyzed through the pairing of glucose and the intermediate in the oxidation to the large amount of the adsorbed OH on the Hg adatom-modified Au electrode.
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