期刊
NANO LETTERS
卷 13, 期 7, 页码 3420-3425出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl401881z
关键词
Platinum-based electrocatalysts; oxygen reduction reaction; fuel cells
类别
资金
- UTC Power
- Georgia Institute of Technology
- World-Class University Program (MEST through NRF) [R31-10026]
Nanoscale Pt-Ni bimetallic octahedra with controlled sizes have been actively explored in recent years owning to their outstanding activity for the oxygen reduction reaction (ORR). Here we report the synthesis of uniform 9 nm Pt-Ni octahedra with the use of oleylamine and oleic acid as surfactants and W(CO)(6) as a source of CO that can promote the formation of {111} facets in the presence of Ni. Through the introduction of benzyl ether as a solvent, the coverage of both surfactants on the surface of resultant Pt-Ni octahedra was significantly reduced while the octahedral shape was still attained. By further removing the surfactants through acetic acid treatment, we observed a specific activity 51-fold higher than that of the state-of-the-art Pt/C catalyst for the ORR at 0.93 V, together with a record high mass activity of 3.3 A mg(Pt)(-1) at 0.9 V (the highest mass activity reported in the literature was 1.45 A mg(Pt)(-1)). Our analysis suggests that this great enhancement of ORR activity could be attributed to the presence of a clean, well-preserved (111) surface for the Pt-Ni octahedra.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据