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Concave Rhombic Dodecahedral Au Nanocatalyst with Multiple High-Index Facets for CO2 Reduction
Hye-Eun Lee, Ki Dong Yang, Sang Moon Yoon
1Department of Chemistry Education, Seoul National University , Seoul 151-748, Korea.
ACS Nano
|July 15, 2015
Summary
Researchers synthesized a stable concave gold nanoparticle with unique facets. This nanoparticle shows enhanced electrocatalytic performance for converting carbon dioxide to carbon monoxide.
Area of Science:
- Nanotechnology
- Materials Science
- Electrochemistry
Background:
- Gold nanoparticles are crucial in catalysis.
- Controlling nanoparticle shape influences catalytic activity.
- 4-aminothiophenol (4-ATP) is a molecule that can interact with gold surfaces.
Purpose of the Study:
- To synthesize a stable concave rhombic dodecahedron (RD) gold nanoparticle.
- To investigate the role of 4-ATP in controlling nanoparticle morphology.
- To evaluate the electrocatalytic performance of the synthesized nanoparticle for CO2 reduction.
Main Methods:
- Synthesis of concave RD gold nanoparticles using 4-ATP as a capping agent during seed-mediated growth.
- Characterization of nanoparticle facets and stability.
- Electrochemical testing for CO2 to CO conversion.
Main Results:
- Successfully synthesized thermodynamically stable concave RD gold nanoparticles with high-index facets ((331), (221), (553)).
- Demonstrated that 4-ATP ligand binding energy and aromatic geometry control gold atom deposition and shape evolution.
- Observed superior electrocatalytic performance for selective CO2 to CO conversion in aqueous solution.
Conclusions:
- Concave RD gold nanoparticles stabilized by 4-ATP exhibit remarkable structural stability.
- The binding of 4-ATP to gold is critical for controlling nanoparticle shape and growth.
- These nanoparticles are promising electrocatalysts for efficient and selective CO2 reduction.
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