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Enhanced Electrocatalysis for the Reduction of Hydrogen Peroxide at New Multiwall Carbon Nanotube Grafted Polydiphenylamine Modified Electrode
Author(s) -
Santhosh Padmanabhan,
Manesh Kalayil Manian,
Lee KwangPill,
Gopalan Anantha Iyengar
Publication year - 2006
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.200503474
Subject(s) - carbon nanotube , materials science , bilayer , electrode , electrocatalyst , amperometry , chemical engineering , nanotechnology , electrochemistry , chemistry , membrane , engineering , biochemistry
A new modified electrode having multiwall carbon nanotube (MWNT) grafted with polydiphenylamine (PDPA) as electrocatalytic layer is fabricated. FESEM image of the modified electrode shows a different morphology indicating the grafting of PDPA over MWNT. This morphology is in quite contrast from the conventional bilayer MWNT/conducting polymer modified electrode. The multiwall carbon nanotube grafted polydiphenylamine (MWNT‐g‐PDPA‐ME) shows excellent electrocatalytic activity towards the reduction of hydrogen peroxide. The combined presence of MWNT and PDPA as a single unit provides better sensitivity than the bilayer configuration (MWNT/PDPA‐ME). This modified electrode shows accelerated electron transfer at the interface with minimized surface fouling and surface renewability. The advantages of MWNT‐g‐PDPA‐ME over the bilayer electrode are demonstrated with chronoamperometric studies. The amperometric response to H 2 O 2 obtained at −300 mV (vs. SCE) is rapid and highly sensitive as evident from the higher (2.83×10 −3 cm 3 mol −1 s −1 ) rate constant for the diffusion reduction process.