In Situ Strain Evolution on Pt Nanoparticles during Hydrogen Peroxide Decomposition

被引：21

作者：

Choi, Sungwook ^{[1
]}

Chung, Myungwoo ^{[1
]}

Kim, Dongjin ^{[1
]}

Kim, Sungwon ^{[1
]}

Yun, Kyuseok ^{[1
]}

Cha, Wonsuk ^{[2
]}

Harder, Ross ^{[2
]}

Kawaguchi, Tomoya ^{[3
]}

Liu, Yihua ^{[3
]}

Ulvestad, Andrew ^{[3
]}

You, Hoydoo ^{[3
]}

Song, Mee Kyung ^{[4
]}

Kim, Hyunjung ^{[1
]}

机构：

[1] Sogang Univ, Dept Phys, Seoul 04107, South Korea

[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[3] Argonne Natl Lab, Mat Sci Div, 9700 S Cass Ave, Argonne, IL 60439 USA

[4] Sogang Univ, Ctr Nano Mat, Seoul 04107, South Korea

来源：

NANO LETTERS | 2020年 / 20卷 / 12期

基金：

新加坡国家研究基金会;

关键词：

Bragg coherent diffraction imaging; strain; 3D imaging; platinum nanoparticle; oxygen reduction reaction; OXYGEN REDUCTION REACTION; PLATINUM; SURFACE; PT(111); H2O2; ELECTROCHEMISTRY; ADSORPTION; OXIDATION;

D O I：

10.1021/acs.nanolett.0c03005

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Fundamental understanding of structural changes during catalytic reactions is crucial to understanding the underlying mechanisms and optimizing efficiencies. Surface energy and related catalytic mechanisms are widely studied. However, the catalyst lattice deformation induced by catalytic processes is not well understood. Here, we study the strain in an individual platinum (Pt) nanoparticle (NP) using Bragg coherent diffraction imaging under in situ oxidation and reduction reactions. When Pt NPs are exposed to H2O2, a typical oxidizer and an intermediate during the oxygen reduction reaction process, alternating overall strain distribution near the surface and inside the NP is observed at the (111) Bragg reflection. In contrast, relatively insignificant changes appear in the (200) reflection. Density functional theory calculations are employed to rationalize the anisotropic lattice strain in terms of induced stress by H2O2 adsorption and decomposition on the Pt NP surface. Our study provides deeper insight into the activity-structure relationship in this system.

引用

页码：8541 / 8548

页数：8

共 39 条

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