Electrocatalytic Reduction of Molecular Oxygen at Poly (1, 8-Diaminonaphthalene) and Polypyrrole Multi-Wall Carbon Nanotubes Modified Glassy Carbon Electrodes
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Date
2010-06
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Addis Ababa Universty
Abstract
The electrochemical growth current of poly (1, 8- Diaminonaphthalene) and polypyrrole and their redox currents were enhanced several-fold when deposited on carbon nanotubes modified glassy carbon electrode compared the bare glassy carbon electrode surface. Cyclic voltammetry were used to characterize the modified film on the electrode surface. The electrocatalytic ability of the modified electrodes for the reduction of molecular oxygen was investigated using cyclic voltammetry and rotating disk techniques in 0.2 M NaSO4 (pH=1) solution. GC/MWCNT/p-DAN modified electrode showed good electrocatalytic activity for oxygen reduction reaction. The oxygen reduction behavior of GC/MWCNT/p-DAN electrode at different deposition cycle (5 and 8) of p-DAN was investigated using rotating disk electrodes and compared with each other. The RDE data indicated that the reduction of oxygen on both electrodes of GC/MWCNT/p-DAN proceeds by four-electron pathway in 0.2 M NaSO4 (pH=1) solution. From Koutecky-Levich analysis, the kinetics parameters (total number of exchanged electrons, limiting current, rate constant, exchange current, Tafel slope and transfer coefficient) were determined.
Keywords; Electrocatalysis, Electropolymerization, Multi-walled carbon nanotubes, Oxygen Reduction, poly (1, 8- Diaminonaphthalene), polypyrrole
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Keywords
Electrocatalysis; Electropolymerization; Multi-walled carbon nanotubes; Oxygen Reduction,;poly (1; 8- Diaminonaphthalene); polypyrrole