Journal
ACS NANO
Volume 10, Issue 4, Pages 4559-4564Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b00602
Keywords
high-energy facets; copper; rhombic dodecahedron; chemical etching; surface energy
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Funding
- National Natural Science Foundation of China [21403160, 21471123, 51202180]
- Xi'an Jiaotong University
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- U.S. National Science Foundation [CHE-1308587]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1308587] Funding Source: National Science Foundation
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Creating high-energy facets on the surface of catalyst nanocrystals represents a promising method for enhancing their catalytic activity. Herein we show that crystal etching as the reverse process of crystal growth can directly endow nanocrystal surfaces with high-energy facets. The key is to avoid significant modification of the surface energies of the nanocrystal facets by capping effects from solvents, ions, and ligands. Using Cu nanocubes as the starting material, we have successfully demonstrated the creation of high-energy facets in metal nanocrystals by controlled chemical etching. The etched Cu nanocrystals with enriched high-energy {110} facets showed significantly enhanced activity toward CO2 reduction. We believe the etching-based strategy could be extended to the synthesis of nanocrystals of many other catalysts with more active high-energy facets.
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