高活性、可循环的Pt-Cu@3D石墨烯复合催化剂的制备和催化性能

摘要

A composite hydrogel consisting of well-dispersed Pt-Cu nanoparticles (NPs) supported on three-dimensional (3D) graphene (Pt-Cu@3DG) was successfully prepared by mild chemical reduction.The 3D interconnected macroporous structure of the graphene framework not only possesses large specific surface area that allows high metal loadings,but also facilitates mass transfer during the catalytic reaction.The Pt-Cu bimetallic alloy NPs show good catalytic activity compared with Pt NPs and reduce the content of Pt NPs used,thereby lowering costs.The morphology and composition of the Pt-Cu@3DG composite were investigated by scanning electron microscopy (SEM),transmission electron microscopy (TEM),X-ray photoelectron spectroscopy (XPS),X-ray diffraction (XRD),and energy-dispersive X-ray spectroscopy (EDX).The catalysis studies indicate that the resulting composites can be used as an efficient,inexpensive,recyclable,and stable catalyst for the reduction of 4-nitrophenol to 4-aminophenol under mild conditions.%以氧化石墨烯为前驱体,通过氧化还原法制备了具有三维大孔稳定结构的Pt-Cu@3D石墨烯催化剂.作为载体,三维石墨烯的宏观大孔结构具有大比表面积,可以更好地促进催化反应中的传质过程.以对硝基苯酚的还原为模型反应,通过实验确定Pt与Cu的最佳质量比为3∶5,利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、X射线衍射(XRD)和能量色散X射线光谱(EDX)等方法对最优催化剂的结构进行了表征.催化测试表明复合催化剂在对硝基苯酚还原反应中具有高效稳定、低成本、可循环的良好性能.