纳米浇注法制备有序介孔WC/C复合材料及电催化性能

Preparation of ordered mesoporous tungsten carbide/carbon composites by nanocasting method and its electrocatalysis

以介孔SiO2为硬模板,通过纳米浇注法在模板孔道中引入不同质量配比的碳源和钨源前驱物,经过高温碳化还原反应,刻蚀除去模板后得到了介观结构有序的SBA-15和KIT-6介孔碳化钨/炭(WC/C)复合材料。采用XRD、TEM、EDX、TGA、CV和N2吸附-脱附等测试手段,对所得复合材料进行了物化性质分析和结构表征。结果表明,该介孔WC/C复合材料具有有序的介观结构(p6mm,Ia3d)、高的比表面积(约500m2/g)和较大的孔径(约4nm)。CV测试表明,三维贯通的有序TC/C-KIT-6为载体负载Pt催化剂,对甲醇的催化氧化具有更优异的作用。

Highly ordered mesoporous tungsten carbide/carbon composites（WC/C） have been successfully synthesized by using phenol-formaldehyde（PF） resin and ammonium tungsten oxide hydrate（AMT） as the precursors,mesoporous silica as hard templates.In the synthesis procedure,first,introduced the precursors via a one-step nanocasting followed by high-temperature carbothermal treatment under a flow of N2/H2 mixture for a certain time.The mesoporous WC/C with two-dimensional（2-D） hexagonal or 3-D bicontinuous cubic arrays can be easily replicated from mesoporous silica SBA-15 and KIT-6 templates,respectively.XRD,TEM,EDX,TGA,cyclic voltammograms（CV） and N2 sorption techniques were employed to characterize the mesoporous WC/C composites.The results showed that the resultant materials had an ordered mesostructure（p6mm,Ia3d）,high surface areas（about 500m2/g） and relatively large mesopores（about 4nm）.Pt supported on ordered TC/C-KIT-6-3 demonstrated larger apparent electrocatalytic current,higher electroactivity than Pt-TC/C-SBA-15-b catalyst.