Effect of Pt-Mn nanoparticles supported on CNT in methanol electro-oxidation reaction, experimental, and theoretical studies
| Autor: | Donald H. Galvan, Jassiel R. Rodriguez, Jorge Noé Díaz de León, Gabriel Alonso Nuñez, Trino A. Zepeda, Y. Verde-Gómez, Joel Antúnez-García, M. Marques da Silva Paula |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mechanical Engineering Nanoparticle Carbon nanotube Condensed Matter Physics Electrochemistry Electrocatalyst Dissociation (chemistry) law.invention chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials law General Materials Science Dehydrogenation Density functional theory Methanol |
| Zdroj: | Journal of Materials Research. 36:4216-4226 |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/s43578-021-00275-6 |
| Popis: | This work reports the facile synthesis of Pt-Mn nanoparticles supported on multiwall carbon nanotubes using the Brust–Schiffrin method and their electrochemical performance during methanol electro-oxidation reaction. According to the topographical and structural results, the Pt-Mn nanoparticles present high dispersion with a narrow size distribution of ~ 2.5 nm. Meanwhile, the electrochemical evaluation exhibits a greatly enhanced electrocatalytic activity. The electrocatalyst's performance improves as Mn increased up to 40 at.% in Pt nanoparticles, but it decreases as Mn reaches 50 at.%. The electrocatalytic activity fall could be attributed to a reduction on active sites favorable to the dissociation and dehydrogenation of methanol. Density functional theory computations reveal that the partial density of states (PDOS) associated with [Mn]3d orbitals could be directly correlated with the observed electrocatalytic behavior. The respective maximum PDOS contribution at the Fermi level also corresponds to the most active electrocatalyst, which contains Mn of ~ 40 at.%. |
| Databáze: | OpenAIRE |
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