炭载Pd-Pb合金纳米粒子对甲酸电催化氧化的影响  

Electrocatalytic Oxidation of Formic Acid on Carbon Supported Pd-Pb Alloy Nanoparticles

作　　者：奚彩明[1] 陈煜[1] 周益明[1] 唐亚文[1] 陈凤凤[1] 陆天虹[1] 

机构地区：[1]南京师范大学化学与环境科学学院,南京210097

出　　处：《高等学校化学学报》2010年第7期1421-1425,共5页Chemical Journal of Chinese Universities

基　　金：国家"八六三"计划项目(批准号:2007AA05Z143;2007AA05Z159);国家自然科学基金(批准号:20573057;20873065)资助

摘　　要：通过浸渍还原方法制备了具有不同化学计量比的炭载Pd-Pb合金纳米粒子催化剂.XRD和TEM测试结果表明,Pd-Pb合金纳米粒子的晶格常数随Pb元素含量的增加而增加,相应的粒子尺寸随Pb元素含量的增加而减小.循环伏安、CO溶出和计时电流等电化学测试结果表明,炭载Pd-Pb合金纳米粒子催化剂对甲酸氧化的电催化活性随Pb含量的增加而降低.Pd catalysts for formic acid oxidation had been extensively investigated due to potential application in direct formic acid fuel cells. To improve the stability of catalysts and promote the oxidation of formic acid through the direct pathway,various Pd-based bimetallic catalysts had been received much attention. In this work,Pd-Pb/C catalysts with different Pd/Pb atomic ratios were prepared by the impregnation-reduction method. The results of powder X-ray diffraction（ XRD） and transmission electron microscope（ TEM） measurement indicated that both crystal lattice constant and particle size of Pd-Pb alloy nanoparticles increased and decreased with increasing Pb/Pd atomic ratio,respectively. The electrocatalytic oxidation of formic acid at Pd-Pb/C catalysts with different Pd/Pb atomic ratios was studied by cyclic voltammetry,CO-stripping and chronoamperometry measurements. It was found that the electrocatalytic activation of Pd-Pb/C electrocatalysts for formic acid oxidation decreases with the increase of Pb/Pd atomic ratio. This may be attributed to the addition of Pb,which results in the poison of Pd catalyst.

关 键 词：甲酸 Pd-Pb纳米粒子 催化剂 电催化氧化 

分 类 号：O646[理学—物理化学] O613.71[理学—化学]