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以氧化铟锡(ITO)透明导电膜玻璃为基底,电化学恒电位法制备AuPd合金纳米粒子.系统考察了AuPd纳米粒子的组成和不同制备条件对其结构和电催化性能的影响.运用扫描电子显微镜(SEM)、X-射线能量散射谱(EDX)、X-射线衍射(XRD)、X-射线光电子能谱(XPS)和电化学方法进行表征.结果表明,制备的AuPd合金中Au:Pd元素比与投料比基本一致,纳米粒子分散均匀;AuPd合金纳米粒子对乙醇电氧化的催化活性和稳定性显著高于纯Pd纳米粒子.当沉积电位-0.3 V、Pd:Au=3:1时,Au1Pd3纳米粒子对乙醇电氧化表现出最高的催化活性和稳定性:其对乙醇氧化峰值电流密度是相同条件下制备的Pd纳米粒子的7.7倍,稳定测试1800 s时乙醇氧化的电流密度(1.05 mA cm~(-2))是Pd纳米粒子(0.02 mA cm~(-2))的52.5倍.
AuPd alloy nanoparticles were prepared by electrochemical constant potential method using indium tin oxide (ITO) transparent conductive glass as substrate, and the effects of the composition of AuPd nanoparticles and their preparation conditions on the structure and electrocatalytic performance were investigated systematically. SEM, X-ray energy dispersive spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical methods.The results show that Au: Pd The ratio of element to the feed ratio is basically the same, and the nanoparticles are evenly dispersed. The catalytic activity and stability of AuPd nanoparticles for ethanol electrooxidation are significantly higher than that of pure Pd nanoparticles. When the deposition potential is -0.3 V, Pd: Au = 3: 1 , The Au1Pd3 nanoparticles exhibited the highest catalytic activity and stability for ethanol electrooxidation. The peak current density of Au1Pd3 was 7.7 times that of the Pd nanoparticles prepared under the same conditions. The stability of the current density of ethanol oxidation at 1800 s (1.05 mA cm ~ (-2)) is 52.5 times of Pd nanoparticle (0.02 mA cm -2).