Amperometric detection of hydrogen peroxide utilizing synergistic action of cobalt hexacyanoferrate and carbon nanotubes chemically modified with platinum nanoparticles

Abstract

In this study, a novel composite of cobalt hexacyanoferrate nanoparticles (CoNP) and platinum nanoparticles (Pt) on carbon nanotubes (CNTs) is obtained by ultrasonically mixing CoNP synthesized in a microemulsion with CNTs chemically modified with platinum nanoparticles (Pt/CNTs). Cyclic voltammetric and amperometric measurements on a 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 hydrogen peroxide (H 2 O 2 ) reduction. 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, Pt and CNTs. This sensor shows a linear response to H 2 O 2 concentrations ranging from 0.2 mM to 1.25 mM with a detection limit of 0.1 mM, a maximum sensitivity of 0.744 A?M 21 and a fast response time below 2 s.

Physicochemical Characteristics of Polypyrrole/(Glucose oxidase)/(Prussian Blue)‐based Biosensor Modified with Ni‐ and Co‐Hexacyanoferrates

“…Besides Prussian Blue (PB), which is indeed ferric hexacyanoferrate, deposits of different metal hexacyanoferrates (such as copper (II), cobalt (II), nickel (II), etc.) potentially can be also used as an electrocatalytic properties promoting material in development of chemical sensors and biosensors . However, the mechanism of hydrogen peroxide reduction catalysis by transition metals hexacyanoferrates is not discovered yet .…”

A Zinc Oxide Carbon Nanotube Based Sensor for In Situ Monitoring of Hydrogen Peroxide in Swimming Pools

“…It is also important that sensing materials are free of surfactants; considerable effort has been made to produce them 5. Current practices to monitor H 2 O 2 concentration include the use of fluorescence 6, chemiluminescence 7, 8, spectrophotometry 9, 10, titration 11, and electrochemical methods 12–14. Electrochemical methods offer numerous advantages, such as real‐time data acquisition, and cost‐effective protocols 3, 15.…”

Nanostructures in Hydrogen Peroxide Sensing

“…By depositing the NPs onto a graphene support, the authors developed a nonenzymatic H O sensor. This sensor had a linear range between 0.6 to 379.5 M and a limit of detection of 0.1 M. A different fabrication approach was taken by Han et al [ 38 ]. Here, a mixture of cobalt hexacyanoferrate nanoparticles (CoNP) and platinum nanoparticles (Pt) on carbon nanotubes (CNTs) was applied to improve hydrogen peroxide sensing.…”