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Platinum/vivianite bifunction catalysts for DMFC

By Nai-Su Pai, Po-Sheng Chang and Shiow-Kang Yen


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

Topics: Direct methanol fuel cells (DMFCs), Vivianite, Electrochemical surface area (ECSA), Carbon mono-oxide (CO) poisoning, Platinum/vivianite (Pt/Vi) bifunction catalysts
Year: 2014
DOI identifier: 10.1016/j.ijhydene.2013.02.089
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