A leaf-branch TiO2/carbon@MOF composite for selective CO2 photoreduction

A leaf-branch TiO2/C@ZIF-L is fabricated by the in-situ growth of leaf-like zeolitic imidazolate frameworks (ZIF-L) on branch-like TiO2/C nanofiber. The resulting composite photocatalyst exhibits improved catalytic efficiency and good selectivity for the CO2 photoreduction on synergistic effect. [Di...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2020-05, Vol.264, p.118519, Article 118519
Main Authors: Zhou, Awu, Dou, Yibo, Zhao, Chen, Zhou, Jian, Wu, Xue-Qian, Li, Jian-Rong
Format: Article
Language:English
Subjects:
Carbon
Carbon dioxide
Holes (electron deficiencies)
Leaf-branch structure
Leaves
Metal-organic framework (MOF)
Metal-organic frameworks
Nanofibers
Photocatalysis
Photoreduction
Reagents
Selectivity
Synergistic effect
TiO2 fibers
Titanium
Titanium dioxide
Z-scheme
Zeolites
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Summary:A leaf-branch TiO2/C@ZIF-L is fabricated by the in-situ growth of leaf-like zeolitic imidazolate frameworks (ZIF-L) on branch-like TiO2/C nanofiber. The resulting composite photocatalyst exhibits improved catalytic efficiency and good selectivity for the CO2 photoreduction on synergistic effect. [Display omitted] •A leaf-branch TiO2/C@MOF composite photocatalyst is well designed and fabricated.•The catalyst shows outstanding activity and selectivity for CO2 photoreduction.•The synergistic effect on enhanced photocatalytic performance is investigated. Photocatalytic CO2 reduction provides a promising way for solving the energy crisis and environmental issues. Herein, a well-integrated photocatalyst is fabricated through growing leaf-like zeolitic imidazolate frameworks (ZIF-L) on branch-like titanium dioxide/carbon (TiO2/C) nanofiber for selective CO2 reduction. This platform enables the study of the synergistic effect of the photocatalytic performance, where the strong CO2 adsorption/activation, highly efficient light-harvesting, promoted electron-hole pairs separation, and specific metal Lewis sites are met by integrating suitable band matched ZIF and TiO2, as well as interfaced graphitic carbon. As a result, a largely increased CO generation rate of 28.6 μmol h−1 g−1 with remarkable selectivity of 99 % is achieved in the TiO2/C@ZnCo-ZIF-L without using sacrificial reagent. This work thus provides an insight into the rational construction of well-integrated composites to enhance photocatalytic performance via a well-balanced synergistic effect.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2019.118519