Solving the Structure of Size-Selected Pt Nanocatalysts Synthesized by Inverse Micelle Encapsulation

被引：81

作者：

Roldan Cuenya, Beatriz ^{[1
,2
,3
]}

Croy, Jason R. ^{[1
]}

Mostafa, Simon ^{[1
,3
]}

Behafarid, Farzad ^{[1
]}

Li, Long ^{[4
]}

Zhang, Zhongfan ^{[4
]}

Yang, Judith C. ^{[4
]}

Wang, Qi ^{[5
]}

Frenkel, Anatoly I. ^{[5
]}

机构：

[1] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA

[2] Univ Cent Florida, Nanosci & Technol Ctr, Orlando, FL 32816 USA

[3] Univ Cent Florida, Dept Civil Construct & Environm Engn, Orlando, FL 32816 USA

[4] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA

[5] Yeshiva Univ, Dept Phys, New York, NY 10016 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2010年 / 132卷 / 25期

关键词：

DEPENDENT CATALYTIC-ACTIVITY; RAY-ABSORPTION SPECTROSCOPY; METAL-SUPPORT INTERFACE; ATOMIC-SCALE; FINE-STRUCTURE; NANOPARTICLES; PLATINUM; SHAPE; HYDROGEN; PARTICLES;

D O I：

10.1021/ja101997z

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The structure, size, and shape of gamma-Al2O3-supported Pt nanoparticles (NPs) synthesized by inverse micelle encapsulation have been resolved via a synergistic combination of imaging and spectroscopic tools. It is shown that this synthesis method leads to 3D NP shapes even for subnanometer clusters, in contrast to the raft-like structures obtained for the same systems via traditional deposition-precipitation methods. Furthermore, a high degree of atomic ordering is observed for the micellar NPs in H-2 atmosphere at all sizes studied, possibly due to H-induced surface reconstruction in these high surface area clusters. Our findings demonstrate that the influence of NP/support interactions on NP structure can be diminished in favor of NP/adsorbate interactions when NP catalysts are prepared by micelle encapsulation methods.

引用

页码：8747 / 8756

页数：10

共 63 条

[1] IN-SITU STRUCTURAL CHARACTERIZATION OF A PLATINUM ELECTROCATALYST BY DISPERSIVE-X-RAY ABSORPTION-SPECTROSCOPY [J].