Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (5): 1331-1340.DOI: 10.1016/S1872-2067(21)64005-6

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Construction of 2D Zn-MOF/BiVO4 S-scheme heterojunction for efficient photocatalytic CO2 conversion under visible light irradiation

Zhenlong Zhaoa,b, Ji Biana(), Lina Zhaoa, Hongjun Wua, Shuai Xua, Lei Suna, Zhijun Lia, Ziqing Zhanga(), Liqiang Jinga()   

  1. aKey Laboratory of Functional Inorganic Materials Chemistry (Ministry of Education), School of Chemistry and Materials Science, International Joint Research Center and Lab for Catalytic Technology, Heilongjiang University, Harbin 150080, Heilongjiang, China
    bCollege of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, Heilongjiang, China
  • Received:2021-09-14 Accepted:2021-11-04 Online:2022-05-18 Published:2022-03-23
  • Contact: Ji Bian, Ziqing Zhang, Liqiang Jing
  • Supported by:
    National Natural Science Foundation of China(U1805255);National Natural Science Foundation of China(22105066);National Natural Science Foundation of China(U2102211);Research Project of Education Ministry of Heilongjiang Province of China(135409403)

Abstract:

The construction of S-scheme heterojunction photocatalysts has been regarded as an effective avenue to facilitate the conversion of solar energy to fuel. However, there are still considerable challenges with regard to efficient charge transfer, the abundance of catalytic sites, and extended light absorption. Herein, an S-scheme heterojunction of 2D/2D zinc porphyrin-based metal-organic frameworks/BiVO4 nanosheets (Zn-MOF/BVON) was fabricated for efficient photocatalytic CO2 conversion. The optimal one shows a 22-fold photoactivity enhancement when compared to the previously reported BiVO4 nanoflake (ca. 15 nm), and even exhibits ~2-time improvement than the traditional g-C3N4/BiVO4 heterojunction. The excellent photoactivities are ascribed to the strengthened S-scheme charge transfer and separation, promoted CO2 activation by the well-dispersed metal nodes Zn2(COO)4 in the Zn-MOF, and extended visible light response range based on the results of the electrochemical reduction, electron paramagnetic resonance, and in-situ diffuse reflectance infrared Fourier transform spectroscopy. The dimension-matched Zn-MOF/BVON S-scheme heterojunction endowed with highly efficient charge separation and abundant catalytic active sites contributed to the superior CO2 conversion. This study offers a facile strategy for constructing S-scheme heterojunctions involving porphyrin-based MOFs for solar fuel production.

Key words: BiVO4 nanosheet, 2D zinc porphyrin-based MOFs, modification, S-scheme heterojunction, Visible light catalysis, CO2 conversion