Quantification of hydrogen peroxide using poly Fe (III)-5-Amino 1,10 phenantroline

Abstract

This work reports the results obtained with a composite prepared by dispersing multiple-wall carbon nanotubes in mineral oil (CNTPE) modified with a polymeric matrix of poly Fe(III)-5- Amino 1,10 phenanthroline (MCNTPE). The MCNTPE was used as electrochemical sensor for hydrogen peroxide quantification based on the polymer electrocatalytic effects. The amperometric response to H2O2 on MCNTPE was evaluated at -0,100 and 0,700 V vs Ag/AgCl. At -0,100 V, the sensitivity of the MCNTPE was increased by a factor of 2 orders of magnitude in comparison with the one obtained at CNTPE. At 700 mV, the sensitivity of the modified electrode was increased by a factor of 268 with respect to the non-modified electrode. The sensor also demonstrated to be very stable after continuous use. These results show that a new composite with remarkable electrocatalytic properties can be proposed for the future development of electrochemical (bio)sensors for the quantification of hydrogen peroxide.