采用一步沉淀法,制备了纳米级Pt-CeO2/C电催化剂.透射电镜和X射线衍射表征结果表明,制备的催化剂Pt颗粒均匀分散于碳载体表面,其粒径主要分布于1.5～2.5 nm.将Pt-CeO2/C催化剂制备成质子交换膜燃料电池膜电极,经循环伏安和单电池极化曲线测试发现,Pt-CeO2/C催化剂性能与Pt/C催化剂的相当.一氧化碳消除伏安测试和单电池的抗一氧化碳性能测试结果表明,Pt-CeO2/C催化剂具有很好的抗一氧化碳氧化性能.%The nano-scale Pt-CeO2/C catalyst was prepared by the co-precipitation method. The results of transmission electron microscopy and X-ray diffraction analysis show that the average size of Pt-CeO2/C noble metal particles (1.5-2.5 nm) is highly dispersed on the carbon supports. Pt-CeO2/C and a commercial Pt/C catalyst from Johnson Matthey Company were investigated by cyclic voltammetry and CO-stripping experiment. The cyclic voltammetry test shows that the Pt-CeO2/C catalyst has similar electrochemical surface area to Pt/C.which indicates that the home-made Pt-CeO2/C catalyst has high electrocatalytic activity for hydrogen oxidation. From the CO-stripping experiment, the Pt-CeO2/C catalyst showed very high CO tolerant activity compared to the Pt/C catalyst. We also fabricated the membrane electrode assembly with Pt-CeO2/C or Pt/C catalyst on the anode (the cathode also used the Pt/C catalyst) and found that Pt-CeO2/C catalyst showed higher performance than Pt/C catalyst. A tentative mechanism was proposed for a possible role of Ce as a co-catalyst in the Pt/C system for CO electrooxidation.
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