Electrocatalytic behahiour of cobalt tetraamino-phthalocyanine in thepresence of a composite of reduced graphene nanosheets and ofmulti-walled carbon nanotubes

Abstract

A composite of multi-walled carbon nanotubes (MWCNT) with reduced graphene nanosheets (rGNS-2)was developed in order to minimize the restacking of the latter. The composite was used to modify a glassycarbon electrode (GCE). GCE was further modified with cobalt tetraamino phthalocyanine (CoTAPc). Themodified electrode is represented as rGNS-2-MWCNT-CoTAPc-GCE. X-ray photoelectron spectroscopy,transmission electron microscopy, scanning electrochemical microscopy and Raman spectroscopy wereused to explore into surface functionalities, morphology and topography of the nanocomposite. The rGNS-2-MWCNT-CoTAPc-GCE had a low limit of detection of 3.32 × 10−8M towards the detection of paraguatas a test analyte. A mechanism for paraquat detection using an rGNS-2-MWCNT-CoTAPc-GCE is alsoproposed in this work