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    Efficient wide-spectrum photocatalytic overall water splitting over ultrathin molecular nickel phthalocyanine/BiVO4 Z-scheme heterojunctions without noble metals

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    Type
    Article
    Authors
    Feng, Jiannan
    Bian, Ji
    Bai, Linlu
    Xi, Shibo
    Wang, Ya cc
    Chen, Cailing cc
    Jing, Liqiang cc
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Physical Science and Engineering (PSE) Division
    Date
    2021-04-27
    Online Publication Date
    2021-04-27
    Print Publication Date
    2021-10
    Embargo End Date
    2023-05-04
    Submitted Date
    2021-04-05
    Permanent link to this record
    http://hdl.handle.net/10754/669440
    
    Metadata
    Show full item record
    Abstract
    Photocatalytic overall water splitting (OWS) is a promising route for sustainable production of hydrogen fuels. A grand challenge is developing efficient photocatalysts with extended light absorption, high charge separation and abundant catalytic sites. Here, we designed molecular nickel phthalocyanines on phosphate-functionalized bismuth vanadate nanosheets (NiPc/PO-BVNS) as ultrathin heterojunctions, targeting OWS without noble-metal cocatalysts or sacrificial agents. Optimal NiPc/PO-BVNS affords H2/O2 evolution rates of 23.89/12.23 μmol g−1 h−1 with stoichiometric ratio under UV–vis irradiation, which reaches remarkable 50-fold enhancement over the benchmark g-C3N4/BVNS. The excellent photoactivities are ascribed to the novel Z-scheme charge separation between NiPc and PO-BVNS, where phosphates are proved to induce quasi-single-molecule-layer dispersion of NiPcs by H-bonding effect meanwhile create negative field to trap holes. Moreover, well-defined Ni2+–N4 center of NiPc could function as the catalytic sites for H2 evolution. This work diversifies the artificial photosynthesis systems with a facile strategy of constructing novel Z-scheme organic/inorganic heterojunctions.
    Citation
    Feng, J., Bian, J., Bai, L., Xi, S., Wang, Y., Chen, C., & Jing, L. (2021). Efficient wide-spectrum photocatalytic overall water splitting over ultrathin molecular nickel phthalocyanine/BiVO4 Z-scheme heterojunctions without noble metals. Applied Catalysis B: Environmental, 295, 120260. doi:10.1016/j.apcatb.2021.120260
    Sponsors
    This work was supported by the NSFC project (U1805255).
    Publisher
    Elsevier BV
    Journal
    Applied Catalysis B: Environmental
    DOI
    10.1016/j.apcatb.2021.120260
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0926337321003866
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.apcatb.2021.120260
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center; Physical Science and Engineering (PSE) Division

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