CAJ | 학술논문

采用溶胶法制备了用于阴离子膜直接甲醇燃料电池的Pt-Ni/C阴极电催化剂,用XRD、XPS和TEM对催化剂进行了表征,电位线性扫描伏安法测试电化学活性及抗甲醇性.结果表明,制备的Pt-Ni合金颗粒分布均匀,粒径为3～5 nm;掺杂Ni元素可显著增加Pt的催化活性和抗甲醇性,在相同碱性电解液中,不同原子比例Pt-Ni/C的催化剂以Pt50Ni50/C的活性最高,抗甲醇性相对Pt/C有显著提高,在0.1 mol/L KOH溶液中其最大电流密度达到106 mA/mg,氧电还原起始过电位比Pt/C的小50 mV.
채용용효법제비료용우음리자막직접갑순연료전지적Pt-Ni/C음겁전최화제,용XRD、XPS화TEM대최화제진행료표정,전위선성소묘복안법측시전화학활성급항갑순성.결과표명,제비적Pt-Ni합금과립분포균균,립경위3～5 nm;참잡Ni원소가현저증가Pt적최화활성화항갑순성,재상동감성전해액중,불동원자비례Pt-Ni/C적최화제이Pt50Ni50/C적활성최고,항갑순성상대Pt/C유현저제고,재0.1 mol/L KOH용액중기최대전류밀도체도106 mA/mg,양전환원기시과전위비Pt/C적소50 mV.
Carbon-supported Pt-Ni catalyst samples were prepared by the colloidal method and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopic (XPS) and transmission electron microscopy (TEM). Potentiodynamic was used to measure the performance of the electro-catalysts for the oxygen electro-reduction. The results indicate that the Pt-Ni alloy particles are distributed homogeneously on the carbon surface, and their particle sizes are 3-5 nm. In the same alkali concentration solution, the activity and methanol-tolerance of Pt nano-particle catalysts are greatly enhanced by doping Ni. For the catalyst, the optimum atom ratio of Pt to Ni is Pt50Ni50/C, and its methanol-tolerance is enhanced markedly as compared with Pt/C. The maximal current of the oxygen electro-reduction over Pt50Ni50/C reaches 106 Ma/mg, and the onset over potential is 50 Mv less than that over Pt/C in 0.1 mol/L KOH solution.