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Tailoring lattice strain in ultra-fine high-entropy alloys for active and stable methanol oxidation

Journal Article


Abstract


  • 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°C (HEA-700) exhibit 0.94% compressive strain compared with that obtained at 400°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.[Figure not available: see fulltext.]

Publication Date


  • 2021

Citation


  • Wang, D., Chen, Z., Huang, Y. C., Li, W., Wang, J., Lu, Z., . . . Wang, S. (2021). Tailoring lattice strain in ultra-fine high-entropy alloys for active and stable methanol oxidation. Science China Materials, 64(10), 2454-2466. doi:10.1007/s40843-020-1635-9

Scopus Eid


  • 2-s2.0-85106278352

Start Page


  • 2454

End Page


  • 2466

Volume


  • 64

Issue


  • 10

Abstract


  • 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°C (HEA-700) exhibit 0.94% compressive strain compared with that obtained at 400°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.[Figure not available: see fulltext.]

Publication Date


  • 2021

Citation


  • Wang, D., Chen, Z., Huang, Y. C., Li, W., Wang, J., Lu, Z., . . . Wang, S. (2021). Tailoring lattice strain in ultra-fine high-entropy alloys for active and stable methanol oxidation. Science China Materials, 64(10), 2454-2466. doi:10.1007/s40843-020-1635-9

Scopus Eid


  • 2-s2.0-85106278352

Start Page


  • 2454

End Page


  • 2466

Volume


  • 64

Issue


  • 10