以无机物NH4 F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.
In this paper,multi-walled carbon nanotubes (MWCNTs)were firstly pretreated with sodium hy-droxide 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 2.4 times higher than that of the commercial Pd/C (JM)catalyst at the same condi-tions.
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