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Characterization and Electrocatalytic Activity of Nanocomposites Consisting of Nanosized Cobalt Tetraaminophenoxy Phthalocyanine, Multi‐walled Carbon Nanotubes and Gold Nanoparticles
Author(s) -
Shumba Munyaradzi,
Nyokong Tebello
Publication year - 2016
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201501058
Subject(s) - phthalocyanine , carbon nanotube , materials science , nanocomposite , nanoparticle , cobalt , nanorod , hydrogen peroxide , catalysis , adsorption , electrocatalyst , colloidal gold , chemical engineering , inorganic chemistry , electrode , electrochemistry , nanotechnology , chemistry , organic chemistry , engineering , metallurgy
Glassy carbon electrodes were modified with composites containing cobalt tetraaminophenoxy phthalocyanine nanoparticles (CoTAPhPc NP ), multi‐walled carbon nanotubes (MWCNT) and gold nanorods (AuNRs). The modified electrodes were studied for their electrocatalytic behavior towards the reduction of hydrogen peroxide. Phthalocyanine nanoparticles significantly improved electron transfer kinetics as compared to phthalocyanines which are not in the nanoparticle form when alone or in the presence of multiwalled carbon nanotubes (MWCNTs). CoTAPhPc NP ‐MWCNT‐GCE proved to be suitable for hydrogen peroxide detection with a catalytic rate constant of 3.45×10 3 M −1 s −1 and a detection limit of 1.61×10 −7 M. Adsorption Gibbs free energy ΔG o was found to be −19.22 kJ mol −1 for CoTAPhPc NP ‐MWCNT‐GCE.