Journal
ACS NANO
Volume 9, Issue 8, Pages 8384-8393Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b03065
Keywords
concave nanoparticle; catalyst; CO2 reduction; high-index facet; benzenethiol; gold
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Funding
- Pioneer Research Center Program through the National Research Foundation of Korea - Ministry of Science, ICT & Future Planning [NRF-2011-0021021]
- Global Frontier R&D Program on Center for Multiscale Energy System - National Research Foundation under the Ministry of Science, ICT Future, Korea [0420-20130104]
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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.
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