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New insight of the photocatalytic behaviors of graphitic carbon nitrides for hydrogen evolution and their associations with grain size, porosity, and photophysical properties

Title
New insight of the photocatalytic behaviors of graphitic carbon nitrides for hydrogen evolution and their associations with grain size, porosity, and photophysical properties
Authors
Oh, JunghoonLee, Jang MeeYoo, YoungjunKim, JeonghoHwang, Seong-JuPark, Sungjin
Ewha Authors
황성주
SCOPUS Author ID
황성주scopus
Issue Date
2017
Journal Title
APPLIED CATALYSIS B-ENVIRONMENTAL
ISSN
0926-3373JCR Link1873-3883JCR Link
Citation
vol. 218, pp. 349 - 358
Keywords
Graphitic carbon nitridePhotocatalystsHydrogen evolution reactionPhotophysical propertiesGrain size
Publisher
ELSEVIER SCIENCE BV
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The development of efficient catalysts for hydrogen evolution reaction (HER) presents a huge technical challenge. Graphitic carbon nitride (g-C3N4) is a promising metal-free, low cost, environment-friendly photocatalyst for HER that is driven by visible light. In this work, the authors provide new insight into the photocatalytic natures of g-C3N4 materials and their dependences on grain size, porosity, chemical structure, and photophysical properties. Three different precursors (urea, melamine, and dicyandiamide) and two gas atmospheres (air or N-2) are used to produce various g-C3N4 materials. The use of urea and air leads to the formation of small grain C3N4 networks and porous structures with large surface areas. HER catalytic activity is promoted by large surface areas and the presence of terminal amine groups, and generation of small-sized Pt nanoparticle co-catalysts with narrow size distribution on the surface of g-C3N4. For samples with similar surface areas, band gaps and lifetimes of photogenerated charge carriers critically determine photocatalytic activities. By examining combinations of the above-mentioned factors, urea driven g-C3N4 produced in a N-2 atmosphere is found to exhibit the best photocatalytic activity (up to 130 mu mol h(-1) g(-1)). (C) 2017 Elsevier B.V. All rights reserved.
DOI
10.1016/j.apcatb.2017.06.067
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자연과학대학 > 화학·나노과학전공 > Journal papers
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