Authors: KANCHAN M SAMANT VRUSHALI S JOSHI KASHINATH R PATIL SANTOSH K HARAM
Publish Date: 2014/05/08
Volume: 37, Issue: 2, Pages: 221-226
Abstract
The role of iron oxide impurities in the electrocatalytic properties of multiwall carbon nanotubes MWCNTs prepared by catalytic chemical vapour decomposition method CCVD is studied in detail A novel magnetically modified electrodes have been developed by which MWCNTs were immobilized on indiumtin oxide ITO electrodes without any chemical binders The electrocatalytic oxidation of dopamine and reduction of hydrogen peroxide have been studied by cyclic voltammetry on magnetically modified electrodes with i MWCNTs with occluded iron oxide impurities FeMWCNTs ii MWCNTs grown on iron oxide nanoparticle particulate films IoMWCNTs and iii pristine iron oxide nanoparticle particulate film IoNPs A shift towards less positive potentials for the oxidation of dopamine was observed which is in the order of FeMWCNTs IoMWCNTs IoNPs Similarly trend towards less negative potentials for the reduction of hydrogen peroxide was observed Thus the electrocatalytic activities displayed by MWCNTs have been attributed to the iron oxide impurities associated with it The systematic variation was related to the nature of interaction of iron oxide nanoparticles with MWCNT surfaceFinancial support from DBT and ISROUoP India is gratefully acknowledged KMS thanks the BRNS CNQSUoP for the Fellowship VSJ thanks to CSIR for senior research fellowship Authors thank the Physics Department University of Pune India for SEM XRD and VSM facilities
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