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Modification of a natural zeolite from Macicas (Cluj County, Romania) with copper(II) (Z-Cu), followed by its incorporation in carbon paste, made of carbon nanotubes and graphite powder as conductive matrix (Z-Cu-G-CNT-CPEs), lead to a stable modified electrode. The Z-Cu-G-CNT-CPEs electrodes show significant electrocatalytic activity toward H₂O₂ reduction. The rate constant for catalytic H₂O₂ reduction, estimated from rotating disk electrode measurements, extrapolated to zero H₂O₂ concentration was found to be 74.4 M^-1 s⁻¹ (pH 7). The amperometric detection of H₂O₂, at -400 mV vs. Ag/AgCl/KCl_sat is characterized by the following electroanalytical parameters: sensitivity of 15.33 mA M⁻¹, detection limit of 0.24 mM and linear domain up to 10 mM H₂O₂.

Keywords: carbon paste electrodes, zeolite, hydrogen peroxide, carbon nanotubes