0d/1d Cu2-Xs/Tio2 S-Scheme Heterojunction with Enhanced Photocatalytic Co2 Reduction Performance Via Surface Plasmon Resonance Induced Photothermal Effects

Improving the sunlight absorption capacity and the charge separation efficiency is of great significance for TiO 2 based photocatalyst to achieve highly efficient CO 2 photoreduction. Herein, we developed a novel 0D/1D Cu 2- x S/TiO 2 S-scheme photocatalyst via a facile solvothermal approach. The optimized 0D/1D Cu 2- x S/TiO 2 photocatalyst exhibited an outstanding CH 4 production rate of 14.1 μmol•h -1 , which was about 3.9 times higher than that of pristine TiO 2 . Density functional theory calculation and experimental analyses demonstrated that the S-scheme heterojunction structure dramatically improved the charge separation efficiency and the reduction ability of the hybrid photocatalyst. Profiting from the surface plasmon resonance effect of Cu 2- x S, the Cu 2- x S/TiO 2 photocatalyst showed an obviously expanded light absorption range, displaying remarkable photothermal effect under full-spectrum light irradiation. Moreover, a possible mechanism of CO 2 photoreduction over the Cu 2- x S/TiO 2 photocatalyst was investigated based on in-situ Fourier transform infrared spectra. Hence, this 0D/1D Cu 2- x S/TiO 2 S-scheme photocatalyst coupled with photothermal effect could provide some useful hints for designing a full-spectrum-responsive CO 2 reduction photocatalyst.