کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1288115 1498027 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrocatalysis of Ni-promoted Cd coated graphite toward methanol oxidation in alkaline medium
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Electrocatalysis of Ni-promoted Cd coated graphite toward methanol oxidation in alkaline medium
چکیده انگلیسی

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 (αa), cathodic electron transfer coefficient (αc) 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.

Figure optionsDownload as PowerPoint slideHighlights
► Nickel–promoted cadmium catalyst is prepared on the graphite substrate by electrodeposition.
► Ni–promoted Cd surface is beneficial kinetically for the methanol oxidation in alkaline media.
► Ni–promoted Cd/C displays better catalytic activity for methanol oxidation in alkaline media.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 205, 1 May 2012, Pages 71–79
نویسندگان
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