Influence of Local Defects on the Dynamics of O-H Bond Breaking and Formation on a Magnetite Surface

被引：15

作者：

Bourgund, Alexander ^{[1
,2
]}

Lechner, Barbara A. J. ^{[1
,2
]}

Meier, Matthias ^{[3
,4
]}

Franchini, Cesare ^{[4
]}

Parkinson, Gareth S. ^{[3
]}

Heiz, Ueli ^{[1
,2
]}

Esch, Friedrich ^{[1
,2
]}

机构：

[1] Tech Univ Munich, Dept Chem, Chair Phys Chem, D-85748 Garching, Germany

[2] Tech Univ Munich, Catalysis Res Ctr, D-85748 Garching, Germany

[3] Tech Univ Wien, Inst Appl Phys, A-1040 Vienna, Austria

[4] Univ Vienna, Ctr Computat Mat Sci, Fac Phys, A-1090 Vienna, Austria

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2019年 / 123卷 / 32期

基金：

欧盟地平线“2020”;

关键词：

FE3O4(001); CO; ADSORPTION; STABILITY; OXIDATION; CATALYST;

D O I：

10.1021/acs.jpcc.9b05547

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：

The transport of H adatoms across oxide supports plays an important role in many catalytic reactions. We investigate the dynamics of H/Fe3O4(001) between 295 and 382 K. By scanning tunneling microscopy at frame rates of up to 19.6 fps, we observe the thermally activated switching of H between two O atoms on neighboring Fe rows. This switching rate changes in proximity to a defect, explained by density functional theory as a distortion in the Fe-O lattice shortening the diffusion path. Quantitative analysis yields an apparent activation barrier of 0.94 +/- 0.07 eV on a pristine surface. The present work highlights the importance of local techniques in the study of atomic-scale dynamics at defective surfaces such as oxide supports.

引用

页码：19742 / 19747

页数：6

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