Effect of oleylamine concentration on the structure and oxygen reduction activity of carbon-supported surface-Pt-enriched Pt3Au electrocatalysts

被引：5
|
作者：
Lee, Kug-Seung [2 ]
Park, Hee-Young [1 ]
Chung, Young-Hoon [1 ]
Yoo, Sung Jong [1 ]
Nam, Suk Woo [1 ,3 ]
Ahn, Docheon [2 ]
Sung, Nark-Eon [2 ]
Jang, Jong Hyun [1 ,3 ]
机构：
[1] Korea Inst Sci & Technol, Fuel Cell Res Ctr, Seoul 136791, South Korea
[2] Pohang Accelerator Lab, Pohang 790834, South Korea
[3] Korea Univ, Green Sch, Seoul 136713, South Korea
来源：
JOURNAL OF POWER SOURCES | 2015年 / 290卷
基金：
新加坡国家研究基金会;
关键词：
Pt3Au nanoparticle electrocatalyst; Surfactant concentration; Oxygen reduction reaction; Bulk CO oxidation; OH adsorption; ALLOY NANOPARTICLE CATALYSTS; DENSITY-FUNCTIONAL THEORY; FUEL-CELL CATALYSTS; PLATINUM NANOPARTICLES; ELECTRONIC-STRUCTURE; PARTICLE PROXIMITY; METAL-SURFACES; LASER-ABLATION; FORMIC-ACID; SIZE;
D O I：
10.1016/j.jpowsour.2015.04.165
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：
For carbon-supported Pt-enriched Pt3Au nanoparticles (Pt3Au/C), the effect of oleylamine (OA) concentration during nanoparticle synthesis is investigated. When the OA concentration is increased from 0.12 mM to 1.2 mM, the particle size of Pt3Au gradually decreased from 5.1 nm to 3.3 nm, whereas the crystal structure and surface Pt concentration are not significantly influenced. With higher OA concentration, the oxygen reduction reaction activity of the Pt3Au/C is largely enhanced, which can be explained by the combined effect of increased specific activity and electrochemical surface area of Pt. It is experimentally confirmed using a bulk CO-oxidation technique that smaller particle size (larger OA concentration) leads to decreased OH adsorption strength, which originates from the double layer overlapping effect of closely adjacent nanoparticles. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：130 / 135
页数：6
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