期刊
SCIENCE CHINA-MATERIALS
卷 64, 期 10, 页码 2454-2466出版社
SCIENCE PRESS
DOI: 10.1007/s40843-020-1635-9
关键词
high-entropy alloys; lattice strain; methanol oxidation; platinum-based catalysts; electrocatalysis
资金
- National Natural Science Foundation of China [51402100, 21573066, 21825201, 22002039, 21522305]
- Scientific Research Foundation of Hunan Provincial Education Department [19C0054]
- Postgraduate Scientific Research Innovation Project of Hunan Province [CX20200441]
- Australian Research Council \ the Australian National Fabrication Facility \ UOW Electron Microscopy Centre [CE 140100012]
- Compute Canada
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- University of Toronto
This study proposes a surface strain strategy to tune the electrocatalytic activity of high-entropy alloys (HEAs), showing that HEA-700 obtained by heat treatment exhibits higher specific activity and mass activity compared to HEA-400, attributed to the compressive strain in the surface Pt layer.
High-entropy alloys (HEAs) have been widely studied due to their unconventional compositions and unique physicochemical properties for various applications. Herein, for the first time, we propose a surface strain strategy to tune the electrocatalytic activity of HEAs for methanol oxidation reaction (MOR). High-resolution aberration-corrected scanning transmission electron microscopy (STEM) and elemental mapping demonstrate both uniform atomic dispersion and the formation of a face-centered cubic (FCC) crystalline structure in PtFeCoNiCu HEAs. The HEAs obtained by heat treatment at 700 degrees C (HEA-700) exhibit 0.94% compressive strain compared with that obtained at 400 degrees C (HEA-400). As expected, the specific activity and mass activity of HEA-700 is higher than that of HEA-400 and most of the state-of-the-art catalysts. The enhanced MOR activity can be attributed to a shorter Pt-Pt bond distance in HEA-700 resulting from compressive strain. The nonprecious metal atoms in the core could generate compressive strain and down shift d-band centers via electron transfer to surface Pt layer. This work presents a new perspective for the design of high-performance HEAs electrocatalysts.
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