Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 297, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120411
Keywords
Aspect ratio; CsPbBr3; Photocatalysis; CO 2 reduction; Two-dimensional MOF
Funding
- National Natural Science Foundation of China [21603191]
- Zhejiang Provincial Natural Sci-ence Foundation of China [LY20B030003, LQ16B010001]
- Public Welfare Technology Application Research Plan Project of Zhe-jiang Province [2017C37024]
- Foundation of Science and Technology Bureau of Jinhua [20204185]
- Self-Topic Fund of Zhejiang Normal University [2020ZS04]
- Open Research Fund of Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Zhejiang Normal University
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By utilizing a two-dimensional Ni based metal-organic framework as a cocatalyst, the conversion efficiency of CsPbBr3 perovskites for photocatalytic CO2 reduction has been significantly enhanced. The enhancement in CO production is positively correlated with the aspect ratio of CsPbBr3, with an increased driving force for promoted interfacial electron transfer and superior charge separation properties.
All-inorganic CsPbBr3 perovskites have been regarded as promising candidates for photocatalytic CO2 reduction, but the conversion efficiency is limited by serious charge recombination and poor surface reactivity. Herein, a two-dimensional Ni based metal-organic framework (NMF) has been employed as a cocatalyst, which not only acts as an electron extractor in enhancing the electron-hole separation, but also serves as a CO2 capturing agent in facilitating the adsorption and activation of CO2 molecules. As a result, 1.8, 2.5 and 4.1-fold enhancement in CO production has been realized for CsPbBr3 nanocubes, nanorods and nanowires, respectively, which is proved to be positively correlated with the aspect ratio of CsPbBr3. The aspect ratio dependent photocatalytic enhancement is attributed to the increased energy difference at the interface between the conduction band of CsPbBr3 and NMF with the elongation of CsPbBr3, which produces an enlarged driving force for promoted interfacial electron transfer and superior charge separation properties.
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