摘要
在含不同摩尔比的Au(Ⅲ)和Pt(Ⅳ)离子的PEG(聚乙二醇)-丙酮溶液中,采用光化学共还原法合成了一组Au@Pt复合纳米粒子,并以炭黑分别对其负载制成Au@Pt/C催化剂。借助于UV-Vis、TEM和HR-TEM的表征,证实复合纳米粒子为球形的核/壳结构;分别以XPS、EDS和电化学方法分析了复合粒子的化学状态、结构特点和Au@Pt/C催化剂的催化性质。结果表明,不同Au:Pt摩尔比的Au@Pt/C催化剂对甲醇氧化反应具有良好的催化活性和稳定性,其中Au:Pt=1:1时形成的Au@Pt/C催化剂电催化活性最高,约为商品Pt/C催化剂的4倍。简要讨论了核/壳结构产生高催化活性的主要原因。
A series of Au@Pt composite nanoparticles was synthesized by photochemical coreduction in the PEG-acetone aqueous solutions containing Au（III） and Pt（IV） ions with different molar ratios. The resulting composites were supported on carbon black for preparing Au@Pt/C catalysts, respectively. By the characterization of UV-Vis spectrum, TEM and HR-TEM, a spherical Au core Pt shell composite nano-structure was confirmed. The chemical state and structure character of the composite nanoparticles and the catalytic property of Au@Pt/C catalysts were analyzed by XPS, EDS and electrochemical method, respectively. The results show that all of Au@Pt/C catalysts with different Au：Pt molar ratios have high catalytic activity and stability for methanol oxidation; among them, the catalytic activity of the Au@Pt/C catalyst formed at Au：Pt=1：1 is the highest and is about 4 times than that of commercial Pt/C catalyst. The primary cause of high catalytic activity of the core/shell structure was discussed.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第4期789-792,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(20863003
51164017)
