A simple method for enhancing the catalytic activity of Pd deposited on carbon nanotubes used in direct formic acid fuel cells
| Autor: | Andrzej Borodzinski, Leszek Stobinski, A. Mikolajczuk-Zychora, Artur Małolepszy, Marta Mazurkiewicz-Pawlicka, Bogusław Mierzwa |
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| Rok vydání: | 2019 |
| Předmět: |
Formic acid fuel cell
Formic acid Catalyst support General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces General Chemistry Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films law.invention Catalysis chemistry.chemical_compound Ammonia chemistry Chemical engineering law Nitric acid 0210 nano-technology Palladium |
| Zdroj: | Applied Surface Science. 476:806-814 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2019.01.114 |
| Popis: | Palladium catalysts deposited on carbon nanotubes are used as the anode material in a direct formic acid fuel cell (DFAFC). In this paper we propose a simple method for enhancing the catalytic activity of Pd deposited on carbon nanotubes for formic acid electrooxidation by using ammonia solution. Multiwall carbon nanotubes (MWCNTs) used as the catalyst support are oxidized with concentrated nitric acid for 6 and 50 h. During the oxidation polynuclear aromatic compounds (PACs) are formed. We propose the use of ammonia solution after the oxidation process to remove the PACs from the carbon nanotubes surface. The properties of differently functionalized MWCNTs are studied and the results show that the use of ammonia solution removes the PACs formed during the oxidation process. The oxidation time of the carbon nanotubes has also a significant effect on the properties of the obtained catalysts. The palladium catalysts deposited on MWCNTs oxidized for a shorter time and rinsed with ammonia solution exhibit the highest initial activity in electrooxidation of formic acid in DFAFC (P = 216 mW mgPd−1). |
| Databáze: | OpenAIRE |
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