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- Title
One‐Step Realization of Crystallization and Cyano‐Group Generation for g‐C<sub>3</sub>N<sub>4</sub> Photocatalysts with Improved H<sub>2</sub> Production.
- Authors
Yu, Huogen; Ma, Haiqin; Wu, Xinhe; Wang, Xuefei; Fan, Jiajie; Yu, Jiaguo
- Abstract
In contrast to conventional disordered g‐C3N4, the ordered arrangement of s‐triazine units and cyano‐group is important for its improved photocatalytic H2 evolution activity. However, the usual synthetic methods include complex, multiple‐step operations or containing the use of toxic materials. Herein, the ordered crystallization and cyano‐group generation are simultaneously realized for the g‐C3N4 photocatalyst (namely, cyano‐group‐modified crystalline g‐C3N4) by a facile and green one‐step Na2CO3‐assisted synthesis approach. It is found that Na2CO3 first effectively promotes the denitrification of dicyandiamide (DCDA) and accelerates its polymerization to produce highly crystalline g‐C3N4. When the temperature is over 500 °C, Na2CO3 facilitates the pyrolysis of partial s‐triazine units to produce cyano‐groups on the g‐C3N4 surface, resulting in the final generation of cyano‐group‐modified crystalline g‐C3N4. Consequently, the resulting cyano‐group‐modified crystalline g‐C3N4 presents a highly increased hydrogen production activity, about twofold higher than that of the bulk g‐C3N4. The increased hydrogen production activity is primarily because of the synergistic effect of the highly crystalline and cyano‐group functional for the resulting cyano‐group‐modified crystalline g‐C3N4. The current technology opens insights for the preparation of other crystalline photocatalysts.
- Subjects
CRYSTALLIZATION; PHOTOCATALYSTS; HAZARDOUS substances; HYDROGEN production; TRIAZINE derivatives; DICYANDIAMIDE; DENITRIFICATION
- Publication
Solar RRL, 2021, Vol 5, Issue 2, p1
- ISSN
2367-198X
- Publication type
Article
- DOI
10.1002/solr.202000372