Journal
APPLIED SURFACE SCIENCE
Volume 515, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.145922
Keywords
MXene; Ti3C2; g-C3N4; H-2-evolution; Photocatalytic mechanism
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Funding
- National Natural Science Foundation of China [51572072, 5170021087]
- China Postdoctoral Science Foundation [2017M622384]
- Research Foundation of Education Department of Hubei Province, China [B2019122]
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Photocatalytic water splitting has been recognized as a hopeful route for producing hydrogen. To design a catalyst with high separation efficiency of photo-induced carriers is critical for boosting hydrogen product rate. In this work, we report an in-situ construction strategy for g-C3N4/Ti3C2 composites by one-step calcination process. And a unique 2D/3D structure was obtained through the uniform distribution of lamellar g-C3N4 on Ti3C2 surface. The photocatalytic hydrogen product rate of optimized g-C3N4/Ti3C2 composite was above six times higher than that of pristine g-C3N4 under visible light irradiation. For purpose of clarifying the potentially photocatalytic mechanism, a series of tests involving Kelvin probe measurements and the density functional theory (DFT) calculations were executed. The results confirmed that the Schottky junction between g-C3N4 and Ti3C2 efficiently restrains the recombination of photo-induced carriers. Furthermore, the excellent conductivity of Ti3C2 and the intimate interface of components corporately facilitate the electron immigration. This work provides a new approach to the fabrication of highly efficient g-C3N4/Ti3C2 composite for photoconversion applications.
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