Abstract
The CoPc-Pt/C system exhibits unique electrocatalytic behavior as cathodic catalyst in direct methanol fuel cells (DMFC). In this work electrochemical behavior of CoPc-Pt/C was studied with emphasis on effects of cobalt phthalocyanine (CoPc) on platinum/carbon. Physical properties and structural change of CoPc-Pt/C and CoPc were investigated using TGA, EDAX, IR, XRD and XPS. Electrochemical techniques were conducted to obtain electrochemical performance of catalysts. All results indicated that CoPc interacts with platinum and modifies the surface of the platinum. The interaction synergizes the electrocatalytic activity of CoPc-Pt/C catalyst for oxygen reduction reaction (ORR). The modification of CoPc prevents platinum from the absorption of methanol and intermediate compounds produced by methanol oxidation reaction (MOR), which improves the resistance of catalysts for methanol poisoning. The presence of metallic cobalt in catalyst increases t he electrocatalytic activity for MOR, however metallic cobalt does not improve resistance of catalyst for methanol poisoning.
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