Electrocatalytic oxidation of ascorbic acid atgraphite–zeolite-modified electrode doped with Cu(II

Chemically modified electrodes (CMEs) have recently attracted much attention [1–6]. They are characterized by a chemically altered surface displaying new qualities that can be exploited for electrochemical purposes. Zeolite modified electrode (ZMEs) form a subcategory of the chemically modified electrodes, which were largely studied [7,8] There are three major reasons why ZMEs are interesting. The first is that they combine the advantages of ion exchange voltammetry with unique molecular sieving properties of the zeolite. One can therefore distinguish between the reactants small enough to diffuse freely within the zeolite framework, and excluded from (or occluded in) the structure, and thus, not directly involved in the mass transport reactions. The second reason is linked to the development of new electro analytical devices (sensors). By combining the attractive properties of zeolites (size selectivity, ion exchange capacity, high thermal and chemical stability) with the high sensitivity of modern electrochemical techniques, improvements should be observed as compared to the other sensors based on chemically modified electrodes