Different types of commercially available lignins were adsorbed end/or electropolymerized on glassy carbon (GC) and polycrystalline gold electrodes. Cyclic voltammetric measurements revealed irreversible electrochemical oxidation leading to the development of reversible redox couple(s). Depending on the electrode material and lignin type up to three redox couples could be detected by electrochemical techniques. The formal potentials of these systems were pH dependent with nearly Nerstian slope of -59 mV/pH unit. Some of thus created chemically modified electrodes could be applied for electrocatalytic oxidation of ascorbic acid or electrocatalytic reduction of nitrite in acidic electrolyte. Additionally it was found that some of adsorbed lignins after electrochemical oxidation significantly reduced overvoltage for oxygen reduction on gold electrodes in wide pH range. Mechanisms of electrochemical oxidation of adsorbed lignins and catalytic action of thus formed redox active ultrathin films will be proposed.

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