Universität zu Köln

Pawar, Rajendra C., Kang, Suhee ORCID: 0000-0001-7345-962X, Han, Hyuksu, Choi, Heechae ORCID: 0000-0002-9390-6607 and Lee, Caroline S. (2019). In situ reduction and exfoliation of g-C3N4 nanosheets with copious active sites via a thermal approach for effective water splitting. Catal. Sci. Technol., 9 (4). S. 1004 - 1013. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 2044-4761

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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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Pawar, Rajendra C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kang, Suhee UNSPECIFIED orcid.org/0000-0001-7345-962X UNSPECIFIED Han, Hyuksu UNSPECIFIED UNSPECIFIED UNSPECIFIED Choi, Heechae UNSPECIFIED orcid.org/0000-0002-9390-6607 UNSPECIFIED Lee, Caroline S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-156384
DOI:	10.1039/c8cy02318b
Journal or Publication Title:	Catal. Sci. Technol.
Volume:	9
Number:	4
Page Range:	S. 1004 - 1013
Date:	2019
Publisher:	ROYAL SOC CHEMISTRY
Place of Publication:	CAMBRIDGE
ISSN:	2044-4761
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GRAPHITIC CARBON NITRIDE; PHOTOCATALYTIC HYDROGEN EVOLUTION; DOPED G-C3N4; CATALYSTS; FILMS Multiple languages Chemistry, Physical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15638