Platinum–carbon electrocatalytic composites via liposome-directed electrodeposition at conductive diamond
| Autor: | Cornel Munteanu, Rodica Daniela Bărăţoiu, Alexandru Ioan Căciuleanu, Tanţa Spătaru, Petre Osiceanu, Nicolae Spătaru, Loredana Preda, Mihai Anastasescu, Alina Iovescu |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Energy Engineering and Power Technology chemistry.chemical_element Diamond 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrocatalyst 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound Fuel Technology Adsorption chemistry Electrode engineering Methanol Composite material 0210 nano-technology Platinum Carbon |
| Zdroj: | International Journal of Hydrogen Energy. 41:22529-22537 |
| ISSN: | 0360-3199 |
| Popis: | A Pt precursor was entrapped in phosphatidylcholine-cholesterol vesicles and the liposomal suspension was used for direct electrodeposition of a Pt-based catalyst on boron-doped diamond (BDD). The average size of the deposited particles ( ca . 15 to ca . 40 nm) is closely related to that of the liposomes and Pt particles are partially embedded into a carbonaceous matrix. Methanol anodic oxidation was used for gauging the electrocatalytic activity of the composites and it was found that the electrodeposition with prior adsorption of the liposomes enables more efficient use of platinum. Without preliminary adsorption, a much higher resistance to fouling was observed for the electrocatalyst. This behavior was ascribed to the presence on the electrodes surface of PtO 2 and of a higher amount of oxygenated carbon states. These species act as oxygen donors contributing to an easier eviction of the adsorbed CO, thus partially regenerating active sites from the electrocatalyst surface. |
| Databáze: | OpenAIRE |
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