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以十六烷基三甲基溴化铵(CTAB)为结构导向剂,正硅酸乙酯(TEOS)为硅源,通过添加碳纳米管(CNTs),制备介孔二氧化硅包覆碳纳米管网状结构的复合材料(C/Si).X射线衍射(XRD)和透射电子显微镜(TEM)显示,介孔二氧化硅的孔道结构高度有序,CNTs均匀分散于二氧化硅刚性骨架中.以其为载体微波负载制备了Pt-C/Si-x纳米粒子催化剂,研究了催化剂在硫酸和甲醇溶液中电催化性能,结果表明,具有较高导电性能的复合材料保持了二氧化硅的均匀的孔道结构有利于电解液存储和质子传输,使得该催化剂显示了良好的电催化活性.其中碳纳米管添加含量为40 mg时,催化剂在H2SO4电解液中的电化学活性面积高达120.9 m2·g-1,远大于Pt/CNTs的电化学活性面积,对甲醇的催化峰电流也达80.3 mA·cm-2.预示其作为直接甲醇燃料电池催化剂载体具有良好的应用前景.
Cetyltrimethylammonium bromide (CTAB) was used as the structure-directing agent and tetraethoxysilane (TEOS) was used as the silicon source. Mesoporous silica coated carbon nanorods were prepared by adding carbon nanotubes (CNTs) (C / Si). X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed that the pore structure of mesoporous silica was highly ordered and CNTs were uniformly dispersed in the rigid framework of silica The Pt-C / Si-x nanoparticle catalyst was prepared by microwave loading on the carrier, and the electrocatalytic performance of the catalyst in sulfuric acid and methanol solution was investigated. The results showed that the composite with higher conductivity retained the silica The uniform pore structure is conducive to electrolyte storage and proton transport, which makes the catalyst show good electrocatalytic activity.When the content of carbon nanotubes is 40 mg, the electrochemically active area of the catalyst in H2SO4 electrolyte reaches as high as 120.9 m2 · g-1, which is much larger than the electrochemically active area of Pt / CNTs. The catalytic peak current of methanol reached 80.3 mA · cm-2, indicating that it has a good application prospect as a direct methanol fuel cell catalyst carrier.