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양자나노과학 연구단
양자나노과학 연구단
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Atomic and electronic structures of graphene-decorated graphitic carbon nitride (g-C3N4) as a metal-free photocatalyst under visible-light

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Title
Atomic and electronic structures of graphene-decorated graphitic carbon nitride (g-C3N4) as a metal-free photocatalyst under visible-light
Author(s)
Jeong T.; Huiyan Piao; Park S.; Jae-Hun Yang; Goeun Choi; Wu Q.; Kang H.; Woo H.J.; Jung S.J.; Kim H.; Bong Gyu Shin; Youngkuk Kim; Hwang E.H.; Choy J.-H.; Young Jae Song
Publication Date
2019-11
Journal
APPLIED CATALYSIS B-ENVIRONMENTAL, v.256, no., pp.UNSP117850 -
Publisher
ELSEVIER SCIENCE BV
Abstract
© 2019Industrial demands for sustainable and renewable energy resources have inspired studies on photonic and electronic properties of graphitic-carbon nitride (g-C3N4) as a promising photocatalyst without precious metal. The absorption and the yield by metal-free pristine g-C3N4 are, however, still limited with hydrogen/oxygen evolution reaction (HER/OER) mostly around ultraviolet-light. Here, we propose the graphene-decorated g-C3N4 as a metal-free photocatalyst under visible-light, based on our atomic-scale measurements and calculations. The g-C3N4 nanosheets on highly-oriented pyrolytic graphite (HOPG) exhibit band-gaps appropriate for visible-light absorption and work-functions tuned for band alignments to supply electrons and holes for HER/OER. Scanning probe microscopy (SPM) measurements for local density of states (LDOS) in atomic scale and work-functions in nanometer scale with ab initio calculations confirmed the various electronic transitions for each nitrogen and carbon atom in different atomic registries. The graphene-decorated g-C3N4, therefore, could provide a breakthrough enabling the efficient water-splitting reactions under visible-light without precious metal
URI
https://pr.ibs.re.kr/handle/8788114/6514
ISSN
0926-3373
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
Center for Quantum Nanoscience(양자나노과학 연구단) > Journal Papers (저널 논문)
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