Collaborative enhancement in charge separation and photon harvesting of 2D/2D heterojunction photocatalysts by horizontal loading of SnS2 nanosheets on g-CN films

作者：Baqi, Sabah; Deng, Bei; Oo, May Thawda; Ullah, Naeem; Zhang, Rui-Qin^*

来源：Catalysis Science & Technology, 2022, 12(16): 5067-5076.

DOI：10.1039/d2cy00849a

• GRAPHITIC CARBON NITRIDE
• ELECTRONIC-STRUCTURE
• HYDROGEN-PRODUCTION
• DOPED G-C3N4
• WATER
• DEGRADATION
• EFFICIENT
• PERFORMANCE
• ADSORPTION
• NANOFIBERS

Highly efficient photocatalysts based on van der Waals 2D type heterojunctions were fabricated by horizontal loading of ultrathin hexagonal SnS2 nanosheets on the surface of a g-CN film via spin coating followed by annealing treatment. As evidenced by micrographs and further confirmed by the first-principles calculations, a large contact area was realized in the heterojunction interface by synthesizing sheet-like structures consisting of these two semiconductors, facilitating considerably enhanced charge separation under visible light illumination. In particular, the g-CN/SnS2 heterojunction annealed at 400 degrees C favors the bonding of Sn-N and C-S resulting in reduction of the bandgap by lowering the conduction band edge and in turn yields ideal electronic structures for photoelectrochemical hydrogen production. Such a heterojunction exhibits significantly improved photoinduced current density in sharp contrast to its isolated parent parts, namely g-CN and SnS2, by a factor of 5 and 4, respectively. The photocurrent response, together with Mott-Schottky plots and photoluminescence spectroscopy, demonstrates the photo synergetic effect of the g-CN/SnS2 heterojunction which strongly boosts the photoinduced interfacial charge transfer, enhancing the charge separation during the reaction and lowering the recombination rate.

• 单位
  山东大学