An effective Z-scheme hybrid photocatalyst based on zinc porphyrin derivative and anatase titanium dioxide microsphere for carbon dioxide reduction. (November 2022)

• Record Type: Journal Article
• Authors: Liu, H.; Chen, S.; Zhang, Y.; Li, R.; Zhang, J.; Peng, T.
• Is Part Of: Materials today sustainability. Volume 19(2022)
• Publication Date: 2022-11
• Subjects: Direct Z-scheme photocatalyst -- Titanium dioxide microsphere -- Porphyrin derivative -- Carbon dioxide photoreduction; Materials science -- Environmental aspects -- Periodicals; Sustainable engineering -- Periodicals; 620.11
• DOI: 10.1016/j.mtsust.2022.100164
• Languages: English
• ISSNs: 2589-2347

Abstract

Abstract: Photocatalysis is considered as one of the most promising technologies to convert carbon dioxide (CO2 ) into high-valued chemicals. Herein, a novel hybrid photocatalyst for effectively catalyzing CO2 reduction reaction (CO2 RR) is synthesized using zinc(II)- tetra -(4-pyridyl) porphyrin (ZnPy4 ) and MnO x -decorated anatase titanium dioxide (TiO2 ) microspheres (Mn/AMS) as raw materials. The resultant ZnPy4 -Mn/AMS hybrid material exhibits excellent photocatalytic CO2 RR performance with methane (CH4 )/ carbon monoxide (CO) yields of 44.1/20.9 μmol/(g∙h) and an overall photo-activity of 394.6 μmol/(g∙h), 6.5 times higher than that of anatase TiO2 microsphere (AMS) alone. The effects of ZnPy4 /MnO x species on the light absorption, photo-induced charge separation, photo-electrochemical behavior, adsorption/activation capacity of reactants (CO2 /H2 O) and photocatalytic CO2 RR performance of the AMS were studied, and it is found that a direct Z-scheme charge transfer mechanism proceeds in the hybrid material via H-bonding formed between the ZnPy4 and Mn/AMS components to boost the photocatalytic CO2 RR activity. These results present an effective strategy for fabricating high-performance artificial photosynthesis for solar-driven CO2 conversion via the hybridization of semiconductor with porphyrin derivative. Graphical abstract: Image 1 Highlights: A hybrid material is prepared using porphyrin derivative and anatase TiO2 microsphere. The resultant hybrid material can effectively photocatalyze the CO2 reduction reaction. A direct Z-scheme mechanism proceeds between the two components of the hybrid material. H-bonding between the two components promotes the photo-induced charge separation.