A Novel Approach to Synthesize Nitrogen-Deficient g-C3N4 for the Enhanced Photocatalytic Contaminant Degradation and Electrocatalytic Hydrogen Evolution

Xiaoxiao Li; Kailian Zhang; Man Zhou; Kai Yang; Shi Yang; Xiaoshuai Ma; Changlin Yu; Yu Xie; Weiya Huang; Qizhe Fan

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자료유형: 학술저널

저자정보: Xiaoxiao Li (Jiangxi University of Science and Technology) Kailian Zhang (Jiangxi University of Science and Technology) Man Zhou (Gannan Medical University) Kai Yang (Jiangxi University of Science and Technology) Shi Yang (Jiangxi University of Science and Technology) Xiaoshuai Ma (Jiangxi University of Science and Technology) Changlin Yu (Guangdong University of Petrochemical Technology) Yu Xie (Nanchang Hangkong University) Weiya Huang (Jiangxi University of Science and Technology) Qizhe Fan (Guangdong University of Petrochemical Technology)

저널정보: 성균관대학교 성균나노과학기술원 NANO NANO Vol.15 No.2

발행연도: 2020.1

수록면: 60 - 72 (13page)

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Graphitic carbon nitride with nitrogen vacancies was successfully synthesized by the three-step method for the calcination of melamine, following urea-assisted hydrothermal and jacjoin calcination approach. The structural, surface, optical and electric properties were characterized by XRD, FT-IR, SEM, TEM, UV–Vis DRS, PL, N2 physical adsorption/desorption and electrochemical methods, which proved that this strategy of modifying g-C3N4 by nitrogen vacancies not only increased the specific surface area, exposed more active sites, but also inhibited the recombination of photogenerated carriers on the surface of photocatalysts, resulting in the enhancement of photocatalytic and electrocatalytic performances. The photocatalytic activities were measured under visible light irradiation ( λ > 420 nm), and their degradation efficiencies could be achieved for 99.8%, 55%, 100% and 99.7% corresponding to that of rhodamine B, acid orange II, methyl orange and methylene blue, respectively. The trapping experiments demonstrated that ·O2- played an important role in the degradation process. In addition, being an active electrocatalyst, nitrogen-deficient g-C3N4 showed a lower Tafel slope, smaller overpotential and the more effective electrochemical surface area compared with that of bare g-C3N4 in neutral media. This work underlines the importance of defect engineering to promote catalytic performance, which can provide a simple and efficient way for modifying g-C3N4 and other N-based catalysts.

#Nitrogen vacancies #calcination-hydrothermal #g-C3N4 #photocatalytic degradation #electrocatalytic hydrogen evolution

참고문헌 (64)

참고문헌 신청

H. Yu / 2016 / Adv. Mater 28:9454

Z. F. Huang / 2015 / Adv. Mater 27:5309

S. Ghosh / 2015 / Nat. Mater 14:505

H. Zhang / 2019 / Adv. Mater 31:1804883

S. H. Li / 2016 / Green. Chem 18:594

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