Atomically Controllable Pd@Pt Core-Shell Nanoparticles towards Preferential Oxidation of CO in Hydrogen Reactions Modulated by Platinum Shell Thickness

被引：35
|
作者：
Cao, Kun [1 ,2 ]
Liu, Xiao [1 ]
Zhu, Qianqian [2 ]
Shan, Bin [2 ]
Chen, Rong [1 ,3 ]
机构：
[1] Huazhong Univ Sci & Technol, State Key Lab Digital Mfg Equipment & Technol Mec, 1037 Luoyu Rd, Wuhan 430074, Peoples R China
[2] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & & Mould Technol Mat Sci, 1037 Luoyu Rd, Wuhan 430074, Peoples R China
[3] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, 1037 Luoyu Rd, Wuhan 430074, Peoples R China
来源：
CHEMCATCHEM | 2016年 / 8卷 / 02期
基金：
中国国家自然科学基金;
关键词：
atomic layer deposition; core-shell structures; nanoparticles; oxidation; planar model catalysts; LAYER DEPOSITION; ELECTROCATALYTIC PROPERTIES; BIMETALLIC NANOPARTICLES; REDUCTION REACTION; CARBON-MONOXIDE; CATALYSTS; ALLOY; AU; NANOCRYSTALS; PERFORMANCE;
D O I：
10.1002/cctc.201500827
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The shell-thickness effect of Pd@Pt core-shell nanoparticles (NPs) towards the preferential oxidation of CO in the presence of excess H-2 (PROX) was investigated. Atomically controllable Pd@Pt core-shell nanoparticles were fabricated by using an area-selective atomic layer deposition (ALD) method. A linear growth rate of Pt on a Pd surface monitored with in situ quartz crystal microbalance indicated that the shell thickness could be controlled by varying the number of ALD cycles. The core-shell Pd@ Pt NPs showed better activity and selectivity than monometallic NPs. The catalyst with a monolayer Pt shell showed optimal performance and minimal Pt loading. The mechanism of the Pt shell on Pd core catalyzed PROX reactions was studied by DFT simulations. The energy barriers to CO oxidation significantly decreased upon coating the catalyst with Pt, which led to enhanced activity and selectivity, and Pd/Pt-1 (monolayer) showed the lowest barrier.
引用
收藏
页码：326 / 330
页数：5
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