The
development of high-efficiency photocatalysts is of great importance
to realize robust solar-driven CO2 conversion; however,
the low carrier separation efficiency and poor light absorption ability
usually limit the performance of the photocatalysts. Herein, a hollow
In2S3/polymeric carbon nitride (IS/CN) heterojunction
was prepared via electrostatic self-assembly and in situ sulfidation
under solvothermal conditions. The intimate interfacial contact between
the IS and CN facilitates the construction of an effective heterojunction,
as demonstrated by X-ray photoelectron spectroscopy (XPS) and transmission
electron microscopy (TEM). The optimized IS/CN-5 sample exhibits a
high CO evolution rate of 483.4 μmol g–1 h–1, which is 99 and 6 times as high as that of IS and
CN, respectively. The improved charge separation and transfer efficiency,
the hollow nanotube structure, and the enhanced CO2 adsorption
ability are the reasons for the excellent photocatalytic activity.
Besides, a possible photocatalytic mechanism of CO2 reduction
by the IS/CN heterojunction was proposed on the basis of the band
structures. This work provides an effective and facile strategy to
construct hollow semiconductor heterojunctions for photocatalytic
applications.