- Title
- Atomic and electronic structures of graphene-decorated graphitic carbon nitride (g-C3N4) as a metal-free photocatalyst under visible-light
- Creator
- Jeong, Taehwan; Piao, Huiyan; Shin, Bong Gyu; Kim, Yungkuk; Hwang, Euy Heon; Choy, Jin-Ho; Song, Young Jae; Park, Sangwoo; Yang, Jae-Hun; Choi, Goeun; Wu, Qinke; Kang, Hyunmin; Woo, Hwi Je; Jung, Seong Jun; Kim, Hanchul
- Relation
- Applied Catalysis B: Environmental Vol. 256
- Publisher Link
- http://dx.doi.org/10.1016/j.apcatb.2019.117850
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2019
- Description
- Industrial 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.
- Subject
- graphitic carbon nitride; graphene; scanning tuneling spectroscopy; hydrogen evolution reaction; oxygen evollution reaction
- Identifier
- http://hdl.handle.net/1959.13/1475691
- Identifier
- uon:49628
- Identifier
- ISSN:0926-3373
- Language
- eng
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