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- Title
Sulfuric Acid Treated g-CN as a Precursor to Generate High-Efficient g-CN for Hydrogen Evolution from Water under Visible Light Irradiation.
- Authors
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
- Abstract
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.
- Subjects
VISIBLE spectra; HYDROGEN; LIGHT absorption; ELECTRONIC structure; WATER; CLEAN energy; SULFURIC acid; SALICYLIC acid
- Publication
Catalysts (2073-4344), 2021, Vol 11, Issue 1, p37
- ISSN
2073-4344
- Publication type
Article
- DOI
10.3390/catal11010037