Enhanced Electrocatalysis for the Reduction of Hydrogen Peroxide at New Multiwall Carbon Nanotube Grafted Polydiphenylamine Modified Electrode
Identifieur interne : 000864 ( Main/Exploration ); précédent : 000863; suivant : 000865Enhanced Electrocatalysis for the Reduction of Hydrogen Peroxide at New Multiwall Carbon Nanotube Grafted Polydiphenylamine Modified Electrode
Auteurs : Padmanabhan Santhosh [Corée du Sud] ; Kalayil Anian Manesh [Corée du Sud] ; Kwang-Pill Lee [Corée du Sud] ; Anantha Yengar Gopalan [Corée du Sud, Inde]Source :
- Electroanalysis [ 1040-0397 ] ; 2006-05.
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Abstract
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 H2O2 obtained at −300 mV (vs. SCE) is rapid and highly sensitive as evident from the higher (2.83×10−3 cm3 mol−1 s−1) rate constant for the diffusion reduction process.
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DOI: 10.1002/elan.200503474
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