碱性条件下Pt-M(Ni,Fe,Mo)/C电催化氧化甲醇的性能对比研究

Performance of Methanol Oxidation on Pt-M(M=Ni, Fe, Mo) Electro-Catalysts in Alkaline Media

采用溶胶法制备了碳载Pt-M(M为Ni,Fe,Mo)电催化剂,并用TEM和XRD技术表征活性物微观结构,实验结果表明,Pt基合金微粒在碳黑表面分布均匀,粒径约为2～4nm.用循环伏安法测定催化剂在不同碱性条件下的活性,研究结果表明,不同掺杂元素催化剂的活性大小顺序为Pt75Ni25/C>Pt75Fe25/C>Pt50Mo50/C,掺杂Ni可明显地促进纳米Pt的催化活性,Pt75Ni25/C在1.0mol/LNaOH+1.0mol/LCH3OH溶液中的峰电流密度可以达到726.9mA/mg.

Carbon supported Pt-M （ M = Ni, Fe, Mo） catalysts were prepared with colloidal method. The catalysts were characterized by TEM and XRD, and the activities of different catalysts were measured v/a the cyclic voltammetry under an alkaline condition for methanol electro-catalytic oxidation. The results show that Pt-based alloys are distributed homogeneously on carbon, the particle sizes are about 2-4 nm, and the activities order of Pt-based alloys is Pt75Ni25/C 〉 Pt75Fe25/C 〉 Pt50Mo50/C. The doping of Ni in the nano-particles of Pt was able to markedly enhance the catalytic activities of Pt/C, and the peak current of Pt75 Ni25/C catalyst reached 726.9 mA/mg in 1.0 mol/L NaOH ＋ 1.0 mol/L CH3OH solution in this experiment.