Concave Rhombic Dodecahedral Au Nanocatalyst with Multiple High-Index Facets for CO2 Reduction

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• 作者：Hye-Eun Lee ; Ki Dong Yang ; Sang Moon Yoon ; Hyo-Yong Ahn ; Yoon Young Lee ; Hyejin Chang ; Dae Hong Jeong ; Yoon-Sik Lee ; Mi Young Kim ; Ki Tae Nam
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：August 25, 2015
• 年：2015
• 卷：9
• 期：8
• 页码：8384-8393
• 全文大小：707K
• ISSN：1936-086X

文摘

A concave rhombic dodecahedron (RD) gold nanoparticle was synthesized by adding 4-aminothiophenol (4-ATP) during growth from seeds. This shape is enclosed by stabilized facets of various high-indexes, such as (331), (221), and (553). Because it is driven thermodynamically and stabilized by 4-ATP ligands, the concave RD maintains its structure over a few months, even after rigorous electrochemical reactions. We discussed the mechanism of the shape evolution controlled by 4-ATP and found that both the binding energy of Au鈥揝 and the aromatic geometry of 4-ATP are major determinants of Au atom deposition during growth. As a possible application, we demonstrated that the concave RD exhibits superior electrocatalytic performance for the selective conversion of CO₂ to CO in aqueous solution.