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In situ reduction and exfoliation of g-C3N4 nanosheets with copious active sites via a thermal approach for effective water splitting

Title
In situ reduction and exfoliation of g-C3N4 nanosheets with copious active sites via a thermal approach for effective water splitting
Author
이선영
Issue Date
2019-01
Publisher
ROYAL SOC CHEMISTRY
Citation
CATALYSIS SCIENCE & TECHNOLOGY, v. 9, No. 4, Page. 1004-1012
Abstract
Poor optical absorbance and charge recombination are the major drawbacks of polymeric graphitic carbon nitride (g-C3N4)-based photocatalysts. In this paper, we show for the first time a single-step in situ technique to control the porosity of two-dimensional g-C3N4 sheets and exfoliate them by introducing ascorbic acid (AA) molecules. The AA simultaneously acts as the carbon (C) source and deposits amorphous C onto g-C3N4 sheets. Nanosized pores are also introduced into the g-C3N4 sheets, leading to a large number of active sites. The as-prepared C-doped porous g-C3N4 nanosheets demonstrate a high visible light-photocatalytic H-2 production activity of 793 mol g(-1) with the optimum structure, which is almost 25 times higher than the value obtained with bulk g-C3N4 (31 mol g(-1)). This exceptional photocatalytic performance arises from the C-doped conjugated system and porous nanosheets. The enhanced photocatalytic H-2 evolution was attributed to the effective separation and transport of charge carriers by the deposition of C onto the nanosheets and an increased number of active sites resulting from the nanopores created inside the g-C3N4 sheets. Moreover, molecular dynamics (MD) simulations confirm that the interaction between AA and melamine molecules at elevated temperatures results in the formation of C-doped porous and exfoliated g-C3N4 structures. Therefore, the present approach is very promising for application to the design of new and efficient photocatalysts for photocatalytic H-2 evolution under visible irradiation.
URI
https://pubs.rsc.org/en/content/articlehtml/2019/cy/c8cy02318bhttps://repository.hanyang.ac.kr/handle/20.500.11754/112141
ISSN
2044-4753; 2044-4761
DOI
10.1039/c8cy02318b
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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