Sequestration of carbon monoxide at room temperature at vacancy sites of graphene
| Autor: | Antonio Politano, Vito Fabio, Danil W. Boukhvalov, Gennaro Chiarello |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Oxide chemistry.chemical_element 010402 general chemistry Photochemistry 01 natural sciences Catalysis law.invention chemistry.chemical_compound Adsorption law Vacancy defect Materials Chemistry 010405 organic chemistry Graphene Electron energy loss spectroscopy Metals and Alloys General Chemistry 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Ceramics and Composites Density functional theory Carbon Carbon monoxide |
| Popis: | By using high-resolution electron energy loss spectroscopy and density functional theory, we have studied the interaction of carbon monoxide with a defected graphene sheet. Both experiments and theory indicate that unsaturated C atoms at vacancies are able to capture carbon monoxide at room temperature. Definitely, the sequestration of carbon monoxide at carbon vacancies implies the formation of a weak C-O-C bond, evidenced by its peculiar vibrational energy of 150 meV (1209 cm-1). We also show that, by tuning the density of vacancies, it is possible to obtain a selective CO adsorption at vacancies without intercalation under the graphene cover. Captured CO molecules are stably adsorbed up to a temperature of 500 K. These findings represent the initial step toward the development of processes for the graphene-mediated partial sequestration and selective oxidation of CO. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|