摘要
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3～5nin；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0．1mol／LKOH溶液中其最大电流密度达到106mA／mg，氧电还原起始过电位比Pt／C的小50mV。
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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第1期1-6,共6页
Rare Metal Materials and Engineering
关键词
碱性介质
Pt-Ni/C
氧电还原
催化活性
抗甲醇性
alkaline media
Pt-Ni/C
oxygen electro-reduction
catalytic activity
methanol-tolerance
