Electrocatalysis of Ni-promoted Cd coated graphite toward methanol oxidation in alkaline medium
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Date
2012Metadata
Citation
Döner, A.,Telli, E., Kardaş, G. (2012). Electrocatalysis of Ni-promoted Cd coated graphite toward methanol oxidation in alkaline medium. Journal of Power Sources, 205, 71-79. DOI: 10.1016/j.jpowsour.2012.01.020.Abstract
The nickel–cadmium (Ni-promoted Cd) catalyst for using direct methanol fuel cell (DMFC) applications
is electrochemically deposited on a graphite substrate. The activity of methanol oxidation is assessed by
recording cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and chronoamperometry
(CA) techniques. The surface morphologies and chemical compositions of catalysts are determined by
scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray florescence
spectroscopy (XRF). Mean roughness of catalysts is measured by atomic force microscopy (AFM). Kinetic
parameters of oxidation such as the anodic electron transfer coefficient (˛a), cathodic electron transfer
coefficient (˛c) and charge transfer rate constant (ks) are calculated. The effect of methanol concentration
and temperature on methanol oxidation is also investigated. The electrochemical measurements show
that the addition of Cd to single coating enhances the electrocatalytic properties for methanol oxidation
and Ni-promoted Cd/C has the best catalytic activity and stability.