超细Pd纳米线表层富Pt作为耐久性氧还原催化剂的研究  

Core-shell Pd@Pt Ultrathin Nanowires as Durable Oxygen Reduction Electrocatalysts

作　　者：王新[1,2,3] 熊云杰 邹亮亮 黄庆红[1] 邹志青[1] 杨辉[1] 

机构地区：[1]中国科学院上海高等研究院,上海201210 [2]中国科学院大学,北京100049 [3]上海科技大学,上海201210

出　　处：《电化学》2017年第6期619-626,共8页Journal of Electrochemistry

基　　金：国家重点研发计划课题(No.2016YFB010201);国家自然科学基金项目(No.21503262;No.21533005)资助

摘　　要：本文控制合成一维方向生长的直径为1.5 nm、长度为11.8 nm的超细Pd纳米线,结合欠电位沉积方法在其表面制备了不同Pt原子层的Pd@Pt核壳结构纳米电催化剂,高分辨透射电镜和光电子能谱结果证实了这种核壳结构及Pt在Pd纳米线上的均匀分布.相比于商业化Pt黑催化剂,该核壳结构电催化剂对酸性介质中的氧气还原反应呈现了较高的电催化活性和增强的耐久性,显著增强的耐久性可归属于催化剂一维结构的稳定性.This paper describes a simple CO-assisted reduction approach for the controllable synthesis of ultrathin Pd nanowires along the one-dimensional（1D） direction.Ultrathin Pt films from one to several atomic layers were successfully decorated onto ultrathin Pd nanowires by utilizing Cu UPD deposition,and followed by in-situ redox replacement reaction of UPD Cu by Pt.The core-shell structure and composition of the Pd@Pt ultrathin nanowires have been verified using transmission electron microscopy and energy dispersive X-ray spectrometry.The core-shell Pd@Pt ultrathin nanowires exhibited comparative electrocatalytic activity and improved durability for the oxygen reduction reaction in comparison with commercial Pt black.The enhanced durability of the core-shell Pd@Pt catalyst could be ascribed to 1D structural stability.

关 键 词：氧还原 电催化 Pd@Pt核壳结构 超细纳米线 耐久性 

分 类 号：O643.36[理学—物理化学]