4.8 Article

Nitrogen enrichment of S-doped nanoporous carbon by g-C3N4: Insight into photosensitivity enhancement

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CARBON
卷 107, 期 -, 页码 895-906

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2016.06.100

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Photosensitive carbonaceous materials were synthesized at 550 degrees C from the mixture of g-C3N4 and a sulfur containing polymer. The extensive characterization of their surface using adsorption of nitrogen, potentiometric titration, TA/MS, XPS, FTIR, SEM and HR-TEM showed that they are porous and their surface is decorated with various functional groups. These features were even enhanced by air oxidation at 350 degrees C. Exposure to visible light resulted in a significant photocurrent generation. The band gap energies are 1.56 eV and 2.11 eV for the initial material and its oxidized counterpart, respectively. This photoactivity is linked to complex surface groups containing nitrogen, sulfur and oxygen in various configurations. They act as photosensitizers, analogous to dyes, injecting photogenerated electrons to the carbonaceous matrix. Important assets of these materials for catalysis and solar energy harvesting are their porosity and electrical conductivity. (C) 2016 Elsevier Ltd. All rights reserved.

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