摘要
采用喷雾干燥法和焙烧处理制备中空介孔三氧化钨微球(HMTTS),在其表面进一步负载活性成分Pd,得到纳米Pd/HMTTS复合催化剂.采用X射线粉末衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)等对催化剂的形貌和晶型结构进行了表征.结果表明,Pd纳米粒子为面心立方晶体结构,均匀地分布在HMTTS表面.采用循环伏安和计时电流法研究了在酸性溶液中Pd/HMTTS催化剂对甲酸的电催化氧化性能,结果表明Pd/HMTTS催化剂比普通的三氧化钨载钯催化剂(Pd/WO3)对甲酸呈现出更高的电催化氧化活性和稳定性.HMTTS独特的中空介孔结构和表面特性以及氢溢流效应有利于甲酸在钯表面的直接脱氢氧化过程的发生.
Hollow mesoporous tungsten trioxide microsphere （HMTTS） was synthesized by spay drying method and employed as the support material for Pd catalyst. The catalyst was characterized by X-ray powder diffraction （XRD）, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM）. The Pd nanoparticles had a face-centered cubic crystal structure and were well dispersed on the external walls of HMTTS. The as-prepared Pd/HMTTS catalyst exhibits higher electrocatalytic activity and good stability during formic acid oxidation in comparison to Pd/VVO3 catalyst. The enhanced catalytic performance is attributed to the unique structure and surface properties of HMTTS and the hydrogen spillover effect which greatly accelerates the direct dehydrogenation of formic acid on palladium.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2014年第1期83-87,共5页
Acta Physico-Chimica Sinica
基金
The project was supported by the Postdoctoral Project Fund of Jiangxi University of Science and Technology,China
Zhejiang Province Science and Technology Department,China(2013C37104)
Natural Science Foundation of Jiangxi Province,China(20132BAB213009)~~
关键词
直接甲酸燃料电池
甲酸氧化
三氧化钨
电催化
介孔材料
Direct formic acid fuel cell
Formic acid oxidation
Tungsten trioxide
Electrocatalyst
Mesoporous material
