Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 61, Issue 43, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202210640
Keywords
Carbon Nitride; Dipolar Spectroscopy; EPR Spectroscopy; Photocatalysis; Pulsed EPR; Radicals
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Funding
- European Commission [884444]
- University of Trieste
- Region FVG [LR 2/2011]
- INSTM
- Italian Ministry of Education MIUR [2017PBXPN4]
- Maria de Maeztu Units of Excellence Program from the Spanish State Research Agency [MDM-2017-0720]
- Universita degli Studi di Torino within the CRUI-CARE Agreement
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This study assesses the influence of morphology and light-excitation on the number and chemical nature of radical defects in carbon nitride (CN) and derives the spatial distribution of native radicals in CN using magnetic dipole-dipole coupling.
Carbon nitride (CN) is a heterogeneous photocatalyst that combines good structural properties and a broad scope. The photocatalytic efficiency of CN is associated with the presence of defective and radical species. An accurate description of defective states-both at a local and extended level-is key to develop a thorough mechanistic understanding of the photophysics of CN. In turn, this will maximise the generation and usage of photogenerated charge carriers and minimise wasteful charge recombination. Here the influence of morphology and light-excitation on the number and chemical nature of radical defects is assessed. By exploiting the magnetic dipole-dipole coupling, the spatial distribution of native radicals in CN is derived with high precision. From the analysis an average distance in the range 1.99-2.34 nm is determined, which corresponds to pairs of radicals located approximately four tri-s-triazine units apart.
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