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標題: Platinum/vivianite bifunction catalysts for DMFC
關鍵字: Direct methanol fuel cells (DMFCs)
Electrochemical surface area (ECSA)
Carbon mono-oxide (CO) poisoning
Platinum/vivianite (Pt/Vi) bifunction catalysts
摘要: Bi-functional catalysts are used to solve the poisoning problem caused by carbon monoxide (CO) which is the intermediate of direct methanol fuel cells (DMFCs). Flower-like vivianite (Fe3(PO4)2·8H2O) spheres with diameter around 10 μm are originally used as supports of Pt to form bifunction catalysts. The cyclic voltammetry in 1 M H2SO4 indicates that the electrochemical surface area (ECSA) of Pt reduced on as-prepared vivianite (Pt/Vi) was 105, greater than 91 m2 g−1 for the commercial Pt/C. Besides, Pt/Vi reveals the less CO poisoning effects, including the greater mass activity in methanol oxidation and the lower onset potential in CO-stripping than Pt/C. These excellent performances on electrolyzes are related to the chemical state of Fe3+ and the coexistence of Pt0 and Pt2+ in Pt/Vi. The former activates the water and yields Fe-OHads at lower potential and the latter may offer an easy way of electron transition.
Appears in Collections:材料科學與工程學系



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