A band structure modulated 2D/2D ZnIn2S4@amorphous polymeric g-C3N4 S-scheme heterojunction for efficient photocatalytic reduction of CO2

The use of solar energy to convert CO2 into solar fuels via photocatalytic reduction represents a promising technology to address climate change. Herein, a unique S-scheme heterojunction of 2D/2D ZnIn2S4 nanosheets@amorphous polymeric carbon nitride (ZIS@APCN) is developed by in situ growth of ZnIn2S4 nanosheets onto two-dimensional porous amorphous polymeric carbon nitride with a finely tuned band structure for photocatalytic reduction of CO2. Benefitting from ultra-thin two-dimensional and rigorous porous structures, notably enhanced CO2 adsorption and increased active surface area are ensured. Moreover, the formed S-scheme heterojunction effectively promotes charge separation. The optimized S-scheme heterojunction of ZIS@APCN yields a CO production rate as high as 1425 mu mol g(-1) h(-1), surpassing pure APCN by similar to 7.34 times and ZIS by similar to 3.98 times. This work introduces a new approach to develop S-scheme heterojunction for efficient CO2 photoreduction by modulating the band structure.