Browsing by Author "Abate Alemwork"

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    Electrocatalytic Reduction of Oxygen at Poly(o-phenylenediamine) and Poly(3,4- ethylenedioxythiophene) at a Carbon Nanotube Modified Glassy Carbon Electrodes
    (Addis Ababa Universty, 2010-06) Abate Alemwork; Admassie Shimelis (PhD)
    Electrochemical behaviour and electrocatalytic reduction of oxygen has been studied at PoPDA, and PEDOT mutiwall carbon nano-tube (MWCNT) composite film modified glassy carbon electrode. Cyclic and rotating disk voltammetric techniques were used to investigate the electrocatalytic activity of MWCNT composite film electrodes for oxygen reduction reaction (ORR). Glassy carbon electrodes modified with multiwall carbon nanotube by casting functionalized carbon nanotube was electropolymerized by using oPDA and EDOT. Koutecky-levich analysis at rotating disk electrode made possible to evaluate the kinetic parameters; total number of exchanged electron, limiting current, Tafel slope and exchange current density. Composites of PoPDA multi-wall carbon nanotube shows enhanced electrocatalytic activity for oxygen reduction reaction but the composite of PEDOT does not show electrocatalytic activity for oxygen reduction reaction. Keywods: ORR, MWCNT, Electrocatalysis, Electropolymerization, Overpotential, Tafel slope, exchange current density.