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In this study,a novel composite of cobalt hexacyanoferrate nanoparticles (CoNP) and platinum nanoparticles (PtNP) on carbon nanotubes (CNTs) is obtained by ultrasonically mixing of CoNP synthesized in microemulsion with CNTs chemically modified with platinum nanoparticles (Pt/CNTs).Cyclic voltammetric and amperometric measurements on glass carbon electrode showed that the composite (called CoNP-Pt/CNTs) exhibits a well-defined pair of redox peaks and a prominent electrocatalytic activity toward the reduction of hydrogen peroxide (H2O2).Besides,the current response of CoNP-Pt/CNTs is 2 orders of magnitude higher than the response of CoNP alone and 1 order of magnitude higher than the response of Pt/CNTs or CoNP/CNTs alone.This higher efficiency can be attributed to a remarkable synergistic effect between CoNP,PtNP and CNTs.This sensor shows a linear response to H2O2 concentrations ranging from 0.2 μM to 1.25 mM with a detection limit of 0.1 μM,a maximum sensitivity of 0.744 A·M?1 and a fast response time below 2 s.