【摘要】 以无机物NH4F为改性剂,对NaOH处理后的多壁碳纳米管(f1-MWCNTs)进行共价键表面修饰得到f2-MWCNTs,将前驱体溶液在紫外光照射下边还原边负载于f2-MWCNTs表面,制得Pd/f2-MWCNTs催化剂。利用FT-IR、TEM、EDS、XRD和XPS等手段对其进行表征,结果表明f2-MWCNTs表面形成C—F、C—N等化学键和Pd/f2-MWCNTs表面存在Pd-F配位键,通过这些化学键的相互作用改变了Pd的电子结构,从而提高Pd纳米粒子的负载率和分散性。通过电化学测试发现,Pd/f2-MWCNTs催化剂对甲醇具有优异的催化性能,其质量电流密度是JM公司商业Pd/C催化剂的2.87倍。更多还原

【Abstract】 In this paper,multi-walled carbon nanotubes(MWCNTs)were firstly pretreated with sodium hydroxide solution(f1-MWCNTs),and then f1-MWCNTs were covalently modified by ammonium fluoride(f2-MWCNTs),which were used as a new support for Pd nanoparticles.The new catalysts(Pd/f2-MWCNTs)were prepared by one-step photochemical reduction technique.FT-IR,TEM,XRD and XPS measurements revealed that the C-F and C-N covalence bonds were easily formed on the surface of f2-MWCNTs.In addition,the surface of Pd/f2-MWCNTs had the coordinate bonds Pd-F.The mutual interaction of these chemical bonds made the change of electronic structure of Pd,which enhanced the loading effect and dispersity of Pd nanoparticles.Cyclic electrochemical experiments indicated that electro-catalytic activity of Pd/f2-MWCNTs catalyst for methanol in alkaline medium was about 2.4times higher than that of the commercial Pd/C(JM)catalyst at the same conditions.更多还原