Phosphate-mediated electrochemical adsorption of cisplatin on gold electrodes
- Resource Type
- Authors
- Francisco Fernandez-Trillo; Marta C. Figueiredo; Paramaconi Rodriguez; Adam Kolodziej; Marc T. M. Koper
- Source
- Electrochimica Acta
Electrochimica Acta, 248, 409-415
- Subject
- General Chemical Engineering
Inorganic chemistry
cisplatin
02 engineering and technology
Overpotential
010402 general chemistry
Electrochemistry
01 natural sciences
carbon monoxide
Nanoclusters
chemistry.chemical_compound
Adsorption
Monolayer
electrocatalysis
phosphate
gold
021001 nanoscience & nanotechnology
0104 chemical sciences
chemistry
adsorption
Electrode
size-dependence
0210 nano-technology
Stoichiometry
Carbon monoxide
- Language
- ISSN
- 0013-4686
This manuscript reports the potential-dependent adsorption and deposition of cisplatin on polycrystalline gold electrode. It was found that this process is mediated by the adsorption of phosphate anions on the gold electrode and that the maximum coverage of Pt adsorbed is given by the maximum coverage of phosphate adsorbed at a given potential. The interaction of cisplatin with the phosphate groups was confirmed by in situ FTIR spectroscopy under external reflexion configuration. Quantitative analysis suggests that the stoichiometry of the phosphate species and the cisplatin adsorbed was 1:1. Moreover, the relationship between the charge of the Pt deposited and the charge of the electrochemical surface area of the Pt deposited on the gold electrodes indicates that 3D nanoclusters of a few atoms of Pt were formed over the gold electrode upon the electrochemical reduction of the adsorbed cisplatin.The Pt nanoclusters formed under these conditions were later evaluated for the oxidation of a monolayer of carbon monoxide. The Pt nanoclusters showed a high overpotential for the oxidation of the carbon monoxide monolayer and the high oxidation overpotential was attributed to the absence of adsorption sites for OH species on the Pt clusters: only at potentials where the OH species are adsorbed at the edge between the Pt nanocluster and the gold support, the oxidation of the carbon monoxide on the Pt nanoparticles takes place.