Electro-catalytic oxidation of methanol on a Ni-Cu alloy in alkaline medium

Jafarian, M ; Sharif University of Technology | 2006

252 Viewed
  1. Type of Document: Article
  2. DOI: 10.1007/s10800-006-9155-6
  3. Publisher: 2006
  4. Abstract:
  5. The electro-catalytic oxidation of methanol on a Ni-Cu alloy (NCA) with atomic ratio of 60/40 having previously undergone 50 potential sweep cycles in the range 0-600 mV vs. (Ag/AgCl) in 1 m NaOH was studied by cyclic voltammetry (CV), chronoamperometry (CA) and impedance spectroscopy (EIS). The electro-oxidation was observed as large anodic peaks both in the anodic and early stages of the cathodic direction of potential sweep around 420 mV vs. (Ag/AgCl). The electro-catalytic surface was at least an order of magnitude superior to a pure nickel electrode for methanol oxidation. The diffusion coefficient and apparent rate constant of methanol oxidation were found to be 2.16 × 10-4 cm2 s-1 and 1979.01 cm 3 mol-1 s-1, respectively. EIS studies were employed to unveil the charge transfer rate as well as the electrical characteristics of the catalytic surface. For the electrochemical oxidation of methanol at 5.0 m concentration, charge transfer resistance of nearly 111 Ω was obtained while the resistance of the electro-catalyst layer was ca. 329 Ω. © Springer 2006
  6. Keywords:
  7. Catalysis ; Cyclic voltammetry ; Electrochemistry ; Nickel ; Nickel alloys ; Oxidation ; Rate constants ; Electro-catalytic oxidation ; Methanol oxidation ; Nickel-copper alloys ; Methanol
  8. Source: Journal of Applied Electrochemistry ; Volume 36, Issue 8 , 2006 , Pages 913-918 ; 0021891X (ISSN)
  9. URL: https://link.springer.com/article/10.1007%2Fs10800-006-9155-6