NDLI: Sulfuric Acid Treated g-CN as a Precursor to Generate High-Efficient g-CN for Hydrogen Evolution from Water under Visible Light Irradiation

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Sulfuric Acid Treated g-CN as a Precursor to Generate High-Efficient g-CN for Hydrogen Evolution from Water under Visible Light Irradiation

Content Provider	MDPI
Author	Kang, Hui-Ju Lee, Tae-Gyu Bari, Gazi A. K. M. Rafiqul Seo, Hye-Won Park, Jae-Woo Hwang, Hyun Jin An, Byeong-Hyeon Suzuki, Norihiro Fujishima, Akira Kim, Jong-Ho Shon, Ho Kyong Jun, Young-Si
Copyright Year	2020
Description	Modifying the physical, chemical structures of graphitic carbon nitride (g-CN) to improve its optoelectronic properties is the most efficient way to meet a high photoactivity for clean and sustainable energy production. Herein, a higher monomeric precursor for synthesizing improved micro-and electronic structure possessing g-CN was prepared by high-concentrated sulfuric acid (SA) treatment of bulk type g-CN (BCN). Several structural analyses show that after the SA treatment of BCN, the polymeric melon-based structure is torn down to cyameluric or cyanuric acid-based material. After re-polycondensation of this material as a precursor, the resulting g-CN has more condensed microstructure, carbon and oxygen contents than BCN, indicating that C, O co-doping by corrosive acid of SA. This g-CN shows a much better visible light absorption and diminished radiative charge recombination by the charge localization effect induced by heteroatoms. As a result, this condensed C, O co-doped g-CN shows the enhanced photocatalytic hydrogen evolution rate of 4.57 µmol/h from water under the visible light (>420 nm) by almost two times higher than that of BCN (2.37 µmol/h). This study highlights the enhanced photocatalytic water splitting performance as well as the provision of the higher monomeric precursor for improved g-CN.
Starting Page	37
e-ISSN	20734344
DOI	10.3390/catal11010037
Journal	Catalysts
Issue Number	1
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2020-12-31
Access Restriction	Open
Subject Keyword	Catalysts Environmental Engineering Graphitic Carbon Nitride Sulfuric Acid Treatment Oxidation and Protonation C, O Co-doping Photocatalytic Hydrogen Evolution Water Splitting
Content Type	Text
Resource Type	Article

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