高利用率多壁碳纳米管负载金铂合金纳米粒子催化剂在碱性溶液中的甲醇电催化氧化性能研究

High Utilization AuPt Nanoparticles Supported on MWCNTS for Methanol Electro-oxidation in Alkaline Medium

使用乙二醇还原法合成了一系列高利用率多壁碳纳米管负载的金铂双金属纳米粒子电催化剂,在碱性溶液中由循环伏安和计时电流法测试该AuPt催化剂对于甲醇氧化反应的电催化活性.透射电子显微镜、X射线衍射与X射线能谱观测催化剂形貌,表征催化剂结构.结果表明,金铂双金属纳米粒子均匀分散在碳纳米管上,催化剂具有良好甲醇电氧化性能.实验表明Au/Pt/MWCNTs比为10∶8∶32(bymass)时,该催化剂具有最高甲醇电氧化峰电流密度与最负起始氧化电位.

We synthesized gold-platinum electrocatalysts supported on multi-walled carbon nanotubes （MWC- NTs） with high utilization by a simple one-step method. A high Pt loading series of bimetallic AuPt/MWCNTs catalysts were prepared by the improved ethylene glycol reduction method, and then were compared in terms of the electrocatalytic activity for methanol electro-oxidation using cyclic voltammetry （CV） and chronoamperometry in alkaline solutions. The structure of AuPt/MWCNTs was characterized by the transmission electron microscopy （TEM）, X-ray diffraction （XRD） and energy-dispersive X-ray spectroscopy （EDS）. The results showed that the AuPt/MWCNTs catalysts had high Pt utilization, uniform AuPt nanoparticles size and good electrocatalytic activity for methanol electro-oxidation. The effect of Au/Pt mass ratio on electrocatalytic activity was also investigated. The highest peak current and lowest onset potential for methanol electro-oxidation appeared at the Au/Pt/ MWCNTS mass ratio of 10： 8： 32.