Site-Specific Modification of Gold Nanoparticles by Underpotential Deposition of Cadmium Atoms
Underpotential deposition (UPD) of cadmium on 15 nm gold nanoparticles stabilized by 1-mercapto-undecane-11-tetra(ethylene glycol) has been studied by cyclic voltammetry (CV). Particles are adsorbed to a hanging mercury drop electrode (HMDE). It is shown that single cadmium atoms are deposited onto...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2018 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/88644 |
| Acceso en línea: | http://hdl.handle.net/11336/88644 |
| Access Level: | acceso abierto |
| Palabra clave: | CADMIUM ELECTROCHEMISTRY GOLD NANOPARTICLES PROTON REDUCTION UNDERPOTENTIAL DEPOSITION https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| Sumario: | Underpotential deposition (UPD) of cadmium on 15 nm gold nanoparticles stabilized by 1-mercapto-undecane-11-tetra(ethylene glycol) has been studied by cyclic voltammetry (CV). Particles are adsorbed to a hanging mercury drop electrode (HMDE). It is shown that single cadmium atoms are deposited onto the same surface sites that are active for adsorptive hydrogen reduction when cadmium is absent. Depending on the solution pH, the deposition of cadmium atoms either blocks hydrogen reduction or vice versa, depending on which process occurs first during the cathodic potential sweep. Another remarkable finding is that single cadmium atoms UPD-deposited are also active for adsorptive hydrogen reduction. The use of CV to interrogate surface protected nanoparticles adsorbed on a HMDE represents a powerful method to study the electrocatalytic activity. |
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