Abstract
Photocatalytic reduction of CO2 has attracted considerable interest owing to its potential to resolve the energy and environmental problems.Nevertheless,the lack of proficient photocatalysts has restricted the application of solar-driven photocatalytic CO2 reduction.Herein,we reported an S-scheme heterojunction by combining g-C3N4 with La3+and Rh3+co-doped SrTiO3 through the elec-trostatic self-assembly method for the efficient photocat-alytic CO2 reduction.In comparison with g-C3N4,the as-prepared CN/LRSTO-30 wt％S-scheme heterojunction not only possesses a broadened visible-light response due to the defect states in La,Rh co-doped SrTiO3 induced by co-doped La3+and Rh3+but also has more adsorption sites for the capture and activation of CO2 molecules.Additionally,separation and transfer efficiency of the photoinduced charge carriers is much enhanced in the CN/LRSTO-30 wt％S-scheme heterojunction via its robust internal elec-tric field,which is firmly demonstrated by in situ irradia-tion X-ray photoelectron spectroscopy technology.Consequently,the prepared S-scheme heterojunction achieves impressive photocatalytic CO2 reduction perfor-mance with an average CO and CH4 evolution rate of 4.1-1.8 μmol·g-1·h-1,respectively,which are～1.9 and～22.5-fold higher than those of pure g-C3N4.This study provides innovative perspectives on the design of creative S-scheme heterojunctions for applications in photocatalytic CO2 reduction.
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