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A comparative investigation of the electrocatalytic oxidation of methanol on poly-NiTCPP and poly-TCPP/Ni modified glassy carbon electrodes

Jafarian, M ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jelechem.2011.09.018
  3. Publisher: 2011
  4. Abstract:
  5. Electro-oxidation of methanol in alkaline solution at a glassy carbon electrode electrochemically modified by a conductive polymeric meso-tetra(4-carboxyphenyl)porphyrinato nickel(II), abbreviated as poly-NiTCPP and also meso-tetra(4-carboxyphenyl)porphyrin with incorporated nickel(II) cations, abbreviated as, poly-TCPP/Ni, were investigated and compared. Both films were prepared by oxidative electro-polymerization of complexes by repetitive cyclic voltammetry (RCV) in 0.1 M NaOH aqueous solution. The electrochemical properties and behaviors and also kinetic values of both films have been characterized and compared using cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS). Similar rate constants (1.48 × 105 and 1.40 × 105 cm3 mol-1 s-1) and also, the electron transfer coefficients (α = 0.54 and 0.58) were determined for methanol electro-oxidation on the surface of GC/poly-NiTCPP and GC/poly-TCPP/Ni electrodes, respectively. Impedance spectroscopy was used to investigate the catalytic oxidation of methanol on the surface of the modified electrodes. Finally, it has been shown that the both electrodes have an acceptable long-term (checked up to 1 month) stability toward methanol oxidation
  6. Keywords:
  7. Electropolymerization ; Alkaline solutions ; Electro-catalytic oxidation ; Electron transfer coefficient ; Glassy carbon electrodes ; Impedance spectroscopy ; Kinetic values ; Methanol electrooxidation ; Methanol oxidation ; Modified electrodes ; Modified glassy carbon electrode ; Oxidation of methanol ; Chronoamperometry ; Cyclic voltammetry ; Electrocatalysis ; Electrochemical corrosion ; Electrochemical impedance spectroscopy ; Electrochemical properties ; Electrodes ; Electropolymerization ; Glass membrane electrodes ; Glassy carbon ; Investments ; Methanol ; Nickel compounds ; Oxidation ; Polymers ; Porphyrins ; Rate constants ; Catalytic oxidation
  8. Source: Journal of Electroanalytical Chemistry ; Volume 663, Issue 1 , December , 2011 , Pages 14-23 ; 15726657 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1572665711004723