The preparation of 2D TpPa-COF/2D g-C3N4 heterojunction via in-situ growth for enhanced visible-light photocatalysis
International Journal of Hydrogen Energy(2024)
摘要
Designing efficient heterojunction structure is an effective strategy to improve the performance of photocatalysis. The reasonable structure of photocatalyst and good interface contact, especially the two-dimensional/two-dimensional (2D/2D) composite heterojunction is considered as one of the most representative heterojunctions. Herein, a series of the 2D TpPa-COF/2D g-C3N4 composite materials are prepared through the in-situ reaction. A series of characterizations, such as X-ray diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) have verified their 2D/2D heterojunction structure. Compared with TpPa-COF and g-C3N4, the absorption edge of TpPa-COF/g-C3N4 composites was extended to 650 nm. The TpPa-COF/g-C3N4 composite exhibited high photocatalytic H2 evolution rate of 17600 μmol g−1·h−1 under visible-light (λ ≥ 420 nm) irradiation, which is 2.3 times and 1760 times of TpPa-COF and g-C3N4, respectively. The apparent quantum yield (AQY) of TpPa-COF/g–C3N4–20 still maintains 0.4% under 700 nm light irradiation. The TpPa-COF/g-C3N4 composite photocatalyst also exhibited enhanced visible-light activity for overall water splitting with H2 and O2 evolution in a stoichiometric ratio of 2:1. This work provides an important strategy for designing efficient heterojunction photocatalysts.
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关键词
Heterojunction,Photocatalysis water splitting,Covalent organic frameworks (COFs),g-C3N4
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