Highly active platinum nanoparticles supported by nitrogen/sulfur functionalized graphene composite for ethanol electro-oxidation
| Autor: | Le Hoang Sinh, Nguyen Dang Luong, Jukka Seppälä, Elena Pastor, Hua Jiang, Jonathan Flórez-Montaño, Tanja Kallio, Petri Kanninen |
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| Přispěvatelé: | Department of Chemistry and Materials Science, Department of Biotechnology and Chemical Technology, Duy Tan University, University of La Laguna, Department of Applied Physics, Department of Chemical and Metallurgical Engineering, Aalto-yliopisto, Aalto University |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
General Chemical Engineering Catalyst support Inorganic chemistry Oxide 02 engineering and technology Carbon nanotube 010402 general chemistry Platinum nanoparticles Electrocatalyst 01 natural sciences Catalysis law.invention chemistry.chemical_compound law Electrochemistry carbon nanotube ta116 Nanocomposite Graphene 021001 nanoscience & nanotechnology ethanol electro-oxidation 0104 chemical sciences chemistry 0210 nano-technology nitrogen sulfur functionalization platinum nanoparticles |
| Popis: | In this study, Pt nanoparticles are deposited on the surface of nitrogen-sulfur functionalized reduced graphene oxide and mixed with double wall carbon nanotubes (Pt/NS-rGO/DWCNT). The obtained nanocomposite is used as an electrocatalyst for the ethanol electro-oxidation reaction (EOR). CO oxidation studies with differential electrochemical mass spectroscopy (DEMS) show a lower onset potential indicating higher poisoning tolerance of these materials. The electrocatalytic activity of the Pt/NS-rGO/DWCNT nanocomposite is studied at different temperatures (40, 50, 60, and 70 °C) and compared with that of Pt/rGO, Pt/rGO/DWCNT composites and commercial carbon-supported Pt catalyst. Pt/rGO/DWCNT and Pt/NS-rGO/DWCNT display significantly higher ethanol electro-oxidation currents especially at low potentials relevant to fuel cell applications. At high temperatures (>50 °C), Pt/NS-rGO/DWCNT is the most active catalyst in concordance with its higher apparent activation energy. Pt/NS-rGO/DWCNT is also the most durable of the catalysts after a 500 potential cycle test and suffers the least from poisoning effects during chronopotentiometric testing. These results allow to conclude that combining NS-functionalized graphene catalyst support with DWCNT to form a composite provides excellent performances due to enhanced Pt electrocatalytic activity from NS-functionalization and enhanced mass transfer from the DWCNT filler. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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