Pt掺杂的纳米Ni电催化氧化甲醇性能的研究  

Performance of Nano-Ni Doped with Pt for Methanol Electro-catalytic Oxidation

作　　者：张忠林[1] 宋慧[1] 刘世斌[1] 李一兵[1] 郝晓刚[1] 段东红[1] 孙彦平[1] 

机构地区：[1]太原理工大学洁净化工研究所,山西太原030024

出　　处：《稀有金属材料与工程》2012年第1期58-63,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(20676088;20776091);高校博士点基金(200801120010);太原科技局大学生创新创业专项(09122049)资助

摘　　要：采用溶胶凝胶法制备了碳载纳米双金属Ni-Pt(5%,质量分数)/C电催化剂,用TEM、XRD和XPS表征金属粒子的形貌、晶相结构、表面元素及其价态,循环伏安法测试催化剂在碱性溶液中电催化氧化甲醇的活性。结果表明,Ni-Pt金属粒子在碳载体上分布均匀,粒径为3～6nm,少量Pt的掺杂对纳米Ni活性有明显提高,其中,合金型Ni-Pt(5%)/C在1.0mol/LNaOH+1.0mol/LCH3OH溶液中峰电流密度可达85.6mA/mg,是Ni/C峰电流密度的8.7倍,达到Pt/C峰电流密度的15.3%。单位质量铂的电流显著提高。Carbon supported nano-nickel-platinum electrocatalyst samples of Ni-Pt（5wt%）/C were prepared by the colloidal-gelatin method.Transmission electron microscopy（TEM）,X-ray diffraction（XRD） and X-ray photoelectron spectroscopy（XPS） were used to evaluate the metal particles＇ morphology,crystal configuration,superficial element constitution and value.Moreover,cyclic voltammeter was employed to measure the catalytic activity for the electro-catalytic oxidation of methanol in an alkaline medium.The results show that Ni-Pt particles are distributed homogeneously on the carbon,with the particle sizes of 3-6 nm;the Pt doping improves largely the activity of Ni nano-particles,and the peak current density of alloy Ni-Pt（5wt%）/C catalyst reaches 85.6 mA/mg in the solution of 1.0 mol/L NaOH ＋ 1.0 mol/L CH3OH,which is 8.7 times of that of Ni/C,and 15.3% of that of Pt/C.The current of Pt per unit mass is increased obviously.

关 键 词：Ni-Pt/C 电催化 甲醇电氧化 碱性介质 

分 类 号：O643.36[理学—物理化学] TM911.4[理学—化学]