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...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21960216_v5_n12_p1586_Brust http://hdl.handle.net/20.500.12110/paper_21960216_v5_n12_p1586_Brust |
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paper:paper_21960216_v5_n12_p1586_Brust2023-06-08T16:35:10Z Site-Specific Modification of Gold Nanoparticles by Underpotential Deposition of Cadmium Atoms cadmium electrochemistry gold nanoparticles proton reduction underpotential deposition Atoms Cadmium Catalyst activity Cyclic voltammetry Deposition Electrochemistry Ethylene Ethylene glycol Fiber optic sensors Hydrogen Metal nanoparticles Reduction Cadmium atoms Cathodic potentials Electrocatalytic activity Hanging mercury drop electrodes Hydrogen reduction Proton reduction Site-specific modifications Underpotential deposition Gold nanoparticles 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. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21960216_v5_n12_p1586_Brust http://hdl.handle.net/20.500.12110/paper_21960216_v5_n12_p1586_Brust |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
cadmium electrochemistry gold nanoparticles proton reduction underpotential deposition Atoms Cadmium Catalyst activity Cyclic voltammetry Deposition Electrochemistry Ethylene Ethylene glycol Fiber optic sensors Hydrogen Metal nanoparticles Reduction Cadmium atoms Cathodic potentials Electrocatalytic activity Hanging mercury drop electrodes Hydrogen reduction Proton reduction Site-specific modifications Underpotential deposition Gold nanoparticles |
| spellingShingle |
cadmium electrochemistry gold nanoparticles proton reduction underpotential deposition Atoms Cadmium Catalyst activity Cyclic voltammetry Deposition Electrochemistry Ethylene Ethylene glycol Fiber optic sensors Hydrogen Metal nanoparticles Reduction Cadmium atoms Cathodic potentials Electrocatalytic activity Hanging mercury drop electrodes Hydrogen reduction Proton reduction Site-specific modifications Underpotential deposition Gold nanoparticles Site-Specific Modification of Gold Nanoparticles by Underpotential Deposition of Cadmium Atoms |
| topic_facet |
cadmium electrochemistry gold nanoparticles proton reduction underpotential deposition Atoms Cadmium Catalyst activity Cyclic voltammetry Deposition Electrochemistry Ethylene Ethylene glycol Fiber optic sensors Hydrogen Metal nanoparticles Reduction Cadmium atoms Cathodic potentials Electrocatalytic activity Hanging mercury drop electrodes Hydrogen reduction Proton reduction Site-specific modifications Underpotential deposition Gold nanoparticles |
| description |
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. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim |
| title |
Site-Specific Modification of Gold Nanoparticles by Underpotential Deposition of Cadmium Atoms |
| title_short |
Site-Specific Modification of Gold Nanoparticles by Underpotential Deposition of Cadmium Atoms |
| title_full |
Site-Specific Modification of Gold Nanoparticles by Underpotential Deposition of Cadmium Atoms |
| title_fullStr |
Site-Specific Modification of Gold Nanoparticles by Underpotential Deposition of Cadmium Atoms |
| title_full_unstemmed |
Site-Specific Modification of Gold Nanoparticles by Underpotential Deposition of Cadmium Atoms |
| title_sort |
site-specific modification of gold nanoparticles by underpotential deposition of cadmium atoms |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_21960216_v5_n12_p1586_Brust http://hdl.handle.net/20.500.12110/paper_21960216_v5_n12_p1586_Brust |
| _version_ |
1768546324694695936 |