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Thermodynamically Stable Mesoporous C3N7 and C3N6 with Ordered Structure and Their Excellent Performance for Oxygen Reduction Reaction

Kim, In Young and Kim, Sungho and Premkumar, Selvarajan and Yang, Jae Hun and Umapathy, Siva and Vinu, Ajayan (2019) Thermodynamically Stable Mesoporous C3N7 and C3N6 with Ordered Structure and Their Excellent Performance for Oxygen Reduction Reaction. In: SMALL .

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Official URL: http://dx.doi.org/10.1002/smll.201903572

Abstract

Carbon nitrides with a high N/C atomic ratio (>2) are expected to offer superior basicity and unique electronic properties. However, the synthesis of these nanostructures is highly challenging since many parts of the C-N frameworks in the carbon nitride should be replaced with thermodynamically less stable N-N frameworks as the nitrogen content increases. Thermodynamically stable C3N7 and C3N6 with an ordered mesoporous structure are synthesized at 250 and 300 degrees C respectively via a pyrolysis process of 5-amino-1H-tetrazole (5-ATTZ). Polymerization of the precursor to the ordered mesoporous C3N7 and C3N6 is clearly proved by X-ray and electron diffraction analyses. A combined analysis including diverse spectroscopy and FDMNES and density functional theory (DFT) calculations demonstrates that the N-N bonds are stabilized in the form of tetrazine and/or triazole moieties in the C3N7 and C3N6. The ordered mesoporous C3N7 represents the better oxygen reduction reaction (ORR) performances (onset potential: 0.81 V vs reversible hydrogen electrode (RHE), electron transfer number: 3.9 at 0.5 V vs RHE) than graphitic carbon nitride (g-C3N4) and the ordered mesoporous C3N6. The study on the mechanism of ORR suggests that nitrogen atoms in the tetrazine moiety of the ordered mesoporous C3N7 act as active sites for its improved ORR activity.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to WILEY-V C H VERLAG GMBH
Keywords: DFT calculations; mesoporous materials; N-rich carbon nitrides; tetrazine; triazole
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Id for Latest eprints
Date Deposited: 02 Jan 2020 09:46
Last Modified: 02 Jan 2020 09:46
URI: http://eprints.iisc.ac.in/id/eprint/64102

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