Ultrahigh Vacuum Synthesis of Strain-Controlled Model Pt(111)-Shell Layers: Surface Strain and Oxygen Reduction Reaction Activity

被引：25
|
作者：
Kaneko, Soma [1 ]
Myochi, Rikiya [1 ]
Takahashi, Shuntaro [1 ]
Todoroki, Naoto [1 ]
Wadayama, Toshimasa [1 ]
Tanabe, Tadao [2 ]
机构：
[1] Tohoku Univ, Grad Sch Environm Studies, Sendai, Miyagi 9808579, Japan
[2] Tohoku Univ, Grad Sch Engn, Sendai, Miyagi 9808579, Japan
来源：
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2017年 / 8卷 / 21期
基金：
日本学术振兴会;
关键词：
CORE-SHELL; THIN-FILM; NANOPARTICLES; CATALYSTS; ELECTROCATALYSIS; PLATINUM; SHAPE; SIZE; NI;
D O I：
10.1021/acs.jpclett.7b02525
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：
In this study, we perform ultrahigh vacuum (UHV) and arc-plasma synthesis of strain-controlled Pt(111) model shells on Pt-Co(111) layers with various atomic ratios of Pt/Co and an oxygen reduction reaction (ORR) activity enhancement trend against the surface strain induced by lattice mismatch between the Pt shell and Pt Co alloy-core interface structures was observed. The results showed that the Pt(111)-shell with 2.0% compressive surface strain vs intrinsic Pt(111) lattice gave rise to a maximum activity enhancement, ca. 13-fold higher activity than that of clean Pt(111). This study clearly demonstrates that the UHV-synthesized, strain-controlled Pt shells furnish useful surface templates for electrocatalysis.
引用
收藏
页码：5360 / 5365
页数：6
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