title: Concave Rhombic Dodecahedral Au Nanocatalyst with Multiple High-Index Facets for CO2 Reduction.
abstract: 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-S 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.
authors.forename: Hye-Eun
authors.initials: HE
authors.lastname: Lee
authors.forename: Ki Dong
authors.initials: KD
authors.lastname: Yang
authors.forename: Sang Moon
authors.initials: SM
authors.lastname: Yoon
authors.forename: Hyo-Yong
authors.initials: HY
authors.lastname: Ahn
authors.forename: Yoon Young
authors.initials: YY
authors.lastname: Lee
authors.affiliation: Department of Chemistry Education, Seoul National University , Seoul 151-748, Korea.
authors.forename: Hyejin
authors.initials: H
authors.lastname: Chang
authors.affiliation: Department of Chemistry Education, Seoul National University , Seoul 151-748, Korea.
authors.forename: Dae Hong
authors.initials: DH
authors.lastname: Jeong
authors.forename: Yoon-Sik
authors.initials: YS
authors.lastname: Lee
authors.forename: Mi Young
authors.initials: MY
authors.lastname: Kim
authors.forename: Ki Tae
authors.initials: KT
authors.lastname: Nam
keywords: CO2 reduction; benzenethiol; catalyst; concave nanoparticle; gold; high-index facet