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-M/C(M=Ru,Sn和Co)阳极电催化剂,并用X射线衍射和X射线能谱技术对催化剂进行了表征.结果表明,制备的Pt-M合金颗粒分布均匀,粒径为2～6nm,其组成与前驱体中相应金属的原子比基本吻合.用循环伏安法测定了催化剂在不同碱性条件下的活性.结果显示,随着碱性的增加,甲醇的起始氧化电位降低,峰电流和催化剂的活性增大;相同碱强度下催化剂活性顺序为Pt50Ru50/C>Pt50Sn50/C>Pt75Co25/C,添加Ru可明显提高Pt/C催化剂的活性.Pt50Ru50/C在1.0mol/LNaOH+1.0mol/LCH3OH溶液中的峰电流密度可达634.7mA/mg.
Carbon-supported Pt-M （M=Ru, Sn, and Co） catalyst samples were prepared by the colloidal method and characterized by X-ray diffraction and energy dispersive X-ray spectroscopy. The results indicated that the Pt-M alloy particles distributed homogeneously on the carbon, the particle size was 2-6 nm, and the proportion of the metal element in the alloy particles coincided with that in the precursor. Cyclic voltammetry was carried out to measure the catalyst activity in different alkaline concentration electrolytes. The onset potential and spike potential for electrocatalytic oxidation of methanol changed and the peak currents increased with the increase in the alkali concentration. The catalyst activity decreased in the order Pt50Ru50/C 〉 Pt50Sn50/C〉 Pt75Co25/C. The activity of Pt/C was enhanced markedly after adding Ru, and the peak current of Pt50Ru50/C reached 634.7 mA/mg in the solution of 1.0 mol/L NaOH ＋ 1.0 mol/L CH3OH at 25 ℃.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第9期787-792,共6页
基金
国家自然科学基金(20476075)
山西省自然科学基金(20041021)资助项目.
关键词
铂
钌
合金催化剂
碱性介质
甲醇
电催化氧化
platinum
ruthenium
alloy catalyst
alkaline medium
methanol
electrocatalytic oxidation
