Enzymeless hydrogen peroxide sensor based on mncontaining conducting metallopolymer

Abstract

The [MnIV4O5(terpy)4(H2O) 2]6+ complex, show great potential for electrode modification by electropolymerization using cyclic voltammetry. The voltammetric behavior both in and after electropolymerization process were also discussed, where the best condition of electropolymerization was observed for low scan rate and 50 potential cycles. A study in glass electrode for better characterization of polymer was also performed. Electrocatalytic process by metal centers of the conducting polymer in H2O2 presence with an increase of anodic current at 0.85 V vs. SCE can be observed. The sensor showed great response from 9.9 x 10-5 to 6.4 x 10-4 mol L-1 concentration range with a detection limit of 8.8 x 10-5 mol L -1, where the electrocatalytic mechanism was based on oxidation of H2O2 to H2O with consequently reduction of MnIV to MnIII. After, the MnIII ions are oxidized electrochemically to MnIV ions. © 2012 The Authors. Published by Elsevier Ltd.