壳聚糖修饰石墨烯负载铂镍催化剂的制备及对甲醇的电催化氧化性能研究

摘要

采用改进的Hummers法合成氧化石墨烯,以壳聚糖修饰的氧化石墨烯为载体,采用浸渍还原法制备了PtmNin/CS-RGO催化剂(m : n=3 : 1,1 : 1,1 : 3).通过扫描电镜、透射电镜、X射线衍射及X射线光电子能谱对催化剂进行了表征,利用循环伏安法和计时电流法考察了催化剂的活性和稳定性.结果表明,Pt3Ni/CS-RGO对于电催化氧化甲醇具有较高的活性和稳定性,Pt3Ni/CS-RGO在1.0 mol·L-1KOH+1.0 mol·L-1 CH3OH溶液中的峰电流为189.89 mA·mg-1.%Graphene oxide was synthesized by the modified Hummers method.PtmNin/CS-RGO catalysts(m : n=3 : 1,1 : 1,1 :3)were prepared by impregnation reduction method using graphene oxide modified by chitosan as supporter. The catalysts were characterized by scanning electron microscopy(SEM),transmission electron microsco-py(TEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).The activity and stability of the catalysts were investigated by cyclic voltammetry(CV)and chro-noamperometry(CA).The results showed that Pt3Ni/CS-RGO had the higher activity and stability for methanol electrocatalytic oxi-dation and the peak current of Pt3Ni/CS-RGO reached 189.89 mA·mg-1in the solution of 1.0 mol·L-1KOH+1.0 mol·L-1 CH3OH.