首页|Graphitic carbon nitride/La,Rh co-doped SrTiO3 S-scheme heterojunction for photocatalytic CO2 reduction
Graphitic carbon nitride/La,Rh co-doped SrTiO3 S-scheme heterojunction for photocatalytic CO2 reduction
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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.
g-C3N4La,Rh co-doped SrTiO3S-scheme heterojunctionSeparation of photogenerated charge carriersPhotocatalytic CO2 reduction
Si-Jie Wan、Yan-Ting Hou、Wang Wang、Guo-Qiang Luo、Chuan-Bin Wang、Rong Tu、Shao-Wen Cao
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Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory,Chaozhou 521000,China
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China
Hubei Technology Innovation Center for Advanced Composites,Wuhan University of Technology,Wuhan 430070,China
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