Pandiyan, Rajesh; Delegan, Nazar; Dirany, Ahmad; Drogui, Patrick 
ORCID: https://orcid.org/0000-0002-3802-2729 et El Khakani, My Ali
(2015).
Correlation of sp² carbon bonds content in magnetron-sputtered amorphous carbon films to their electrochemical H₂O₂ production for water decontamination applications.
Carbon
, vol. 94
.
pp. 988-995.
DOI: 10.1016/j.carbon.2015.07.071.
Résumé
La transcription des symboles et des caractères spéciaux utilisés dans la version originale de ce résumé n’a pas été possible en raison de limitations techniques. La version correcte de ce résumé peut être lue dans le document original. The radio frequency (RF)-magnetron sputtering technique was used to deposit amorphous carbon (a-C) films onto different substrates at different deposition substrate temperatures (Td) ranging from room temperature (RT) to 750 °C. The carbon bonding states of the a-C films were systematically investigated by means of Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) as a function of Td. The Raman analyses clearly show that an increase of Td leads to significant microstructural changes of the initially mixed sp2/sp3 carbon bonds, for the films deposited at RT into a more graphitic like sp2 bonding at higher Td. This increase of [sp2]-bonded fraction of carbon atoms to the detriment of the sp3 bonded ones has been quantitatively confirmed by the XPS carbon C 1s core level spectra analyses. Indeed, the sp3-bonds content of the a-C films is found to diminish from 44% at RT to a minimum value of 16% around Td = 450 °C and then stabilizes around 26% at Td = 750 °C. On the other hand, the hydrogen peroxide (H2O2) production capacity of these a-C films was systematically evaluated, and found to reach its maximum of 11.2 μg/L/cm2 at Td = 450 °C, at which the highest C sp2-bonds content was also observed. We were thus able to point up, for the first time, a fairly linear correlation between the produced amount of H2O2 of the a-C films and their relative [sp2] bonding content, over an [sp2] relative content range as wide as (0–84%). These results clearly demonstrate the relevance of a-C films with a pronounced graphitic like character for H2O2 production. Such a-C cathodes with an enhanced H2O2 production capacity are highly sought for in electrochemical decontamination of water from persistent organic pollutants.
| Type de document: | Article |
|---|---|
| Mots-clés libres: | amorphous carbon; amorphous films; balloons; decontamination; hydrogen bonds; magnetron sputtering; organic pollutants; substrates; water pollution; X ray photoelectron spectroscopy |
| Centre: | Centre Eau Terre Environnement |
| Date de dépôt: | 25 avr. 2018 15:11 |
| Dernière modification: | 08 juin 2023 18:18 |
| URI: | https://espace.inrs.ca/id/eprint/3902 |
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