摘要
采用水热法和牺牲模板法相结合制备具有中空树枝结构的三氧化钨载体（d-WO3）,在其表面进一步负载活性成分Pt,得到纳米Pt/d-WO3复合催化剂。采用X射线粉末衍射（XRD）、透射电镜（TEM）和比表面积和孔结构分析（BET）等对催化剂的形貌和结构进行了表征。结果表明,三氧化钨具有长6μm和宽2μm的中空树枝状结构,孔径分布主要集中在20~120 nm,比表面积为24 m2/g,平均粒径为7.2 nm的Pt纳米粒子均匀分布在其表面。采用循环伏安和计时电流法研究了Pt/dWO3催化剂在酸性溶液中对甲醇的电催化氧化性能。结果表明,Pt/d-WO3催化剂比Pt/C和Pt/WO3催化剂对甲醇有更高的电催化氧化活性和稳定性。d-WO3所具有的中空介孔结构和双功能作用机理有利于甲醇在铂表面的直接脱氢氧化过程。
Hollowdendritic mesoporous tungsten trioxide（ d-WO3） was synthesized by combining the hydrothermal method with the template-sacrificing method; with d-WO3 as a support,Pt/d-WO3 catalyst was prepared through an improved liquid phase reduction method.The Pt/d-WO3 catalyst was characterized by XRD,BET and TEMand its electrocatalytic activity and stability towards methanol electro-oxidation were investigated by cyclic voltammetry and chronoamperometry.The results indicated that d-WO3 exhibits hollowmicrosphere dendritic structure with a length of 6 μm and a width of 2 μm; Pt nanoparticles with a size of 7.2 nm were highly dispersed on the surface of d-WO3.The nitrogen physisorption on d-WO3 displays type IV isotherms,which are typical for the mesoporous materials.Moreover,d-WO3 shows a BET surface area of 24 m2/ g,with a large number of pores around 20 ~ 120 nm.The as-prepared Pt/d-WO3 catalyst exhibits higher electrocatalytic activity and better stability in methanol electro-oxidation in comparison with the Pt/WO3 and Pt/C catalysts.The enhanced catalytic performance of Pt/d-WO3 is attributed to its unique hollowmesoporous structure and the double function,which greatly accelerates the dehydrogenation of methanol on Pt.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2015年第2期251-256,共6页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金(51404110
21263005)
赣鄱英才555工程
江西省博士后择优资助项目基金(2014zy15)
江西理工大学科研基金(NSFJ2014-G08)
关键词
直接甲醇燃料电池
甲醇氧化
三氧化钨
载铂催化剂
电催化
direct methanol fuel cell
methanol electro-oxidation
tungsten trioxide
platinum supported catalyst
electro-catalysis
