Construction of octahedral BiFeWOx encapsulated in hierarchical In2S3 core@shell heterostructure for visible-light-driven CO2 reduction. (January 2019)

• Record Type: Journal Article
• Authors: Wang, Yanan; Zeng, Yiqing; Wan, Shipeng; Zhang, Shule; Zhong, Qin
• Is Part Of: Journal of CO₂ utilization. Volume 29(2019)
• Page Start: 156
• Page End: 162
• Publication Date: 2019-01
• Subjects: CO2 photoreduction -- Heterojunction -- Core-shell structure -- In2S3 -- BiFeWOx; Carbon dioxide -- Periodicals; Carbon dioxide -- Environmental aspects -- Periodicals; Carbon dioxide mitigation -- Periodicals; Carbon dioxide; Carbon dioxide -- Environmental aspects; Carbon dioxide mitigation; Periodicals; 628.53205
• DOI: 10.1016/j.jcou.2018.12.009
• Languages: English
• ISSNs: 2212-9820

Abstract

Graphical abstract: Highlights: Novel 3D BFW@IS-x core-shell heterostructures were rationally fabricated. The BFW@IS-x showed highly efficient photoreduction performance of CO2 . The hierarchical surface of BFW@IS-x catalyst enhanced light harvest. The core-shell heterostructure boosted separation and transfer of photoinduced charge carriers. The possible photoreduction mechanism over BFW@IS-1 composites were discussed. Abstract: Novel 3D BiFeWOx@In2 S3 (BFW@IS-x) core shell heterostructures were rationally designed and fabricated to be used as efficient photocatalysts for CO2 photoreduction. The constructive strategy integrated nano-octahedral BFW and hierarchical IS by growing IS ultrathin nanosheet subunits on surface of BFW. The proposed in site synthesis route resulted in a high dispersion of BFW nanocrystals and the tight interaction between BFW and IS. The obtained core-shell heterostructure boosted separation and transfer of photoinduced charge carriers, evidenced by electrochemical measurement. The hierarchical structure on the surface of BFW@IS-x catalyst enhanced light harvest and provided ample active sites for surface redox reactions. Profiting from these extraordinary chemical and physical characteristics owing to the interaction between BFW and IS, the efficiency of photo-conversion of CO2 to CH4 and CO over BFW@IS-1 heterostructures with optimal proportion was 49.9 μmol h −1 g −1 and 28.9 μmol h −1 g −1, respectively, under visible light irradiation. The CH4 generated rate was about 3.5 and 6.4 times higher than that of pure IS and BFW, and CO generated rates was 4.9 times higher than that of pure IS, respectively. The possible mechanism for the CO2 reduction over BFW@IS-1 composite was discussed.