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Visible-light-induced water splitting on a hierarchically constructed Z-scheme photocatalyst composed of zinc rhodium oxide and bismuth vanadate

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Abstract

Precise control of the interface in a solid-state heterojunction Z-scheme photocatalyst is important for achieving the intended photocatalytic activity. Herein, we have designed a photocatalyst with a hierarchical structure by photodepositing gold (Au) on the (040) facet of decahedral bismuth vanadate (BiVO4) and then loading zinc rhodium oxide (ZnRh2O4) on the Au surface. Owing to the facet-dependent charge separation property of the decahedral BiVO4, photoexcited electrons in BiVO4 accumulate at the (040) facet and then transfer to Au, which acts as a solid electron mediator, to combine with holes of ZnRh2O4. Utilizing the thus-constructed Z-scheme photocatalyst (ZnRh2O4/Au/BiVO4), the simultaneous liberation of hydrogen (H2) and oxygen (O2) from water at a molar ratio of 2 : 1 was achieved under irradiation with visible light up to a wavelength of 540 nm, whereas neither H2 nor O2 was produced when Au was deposited randomly on the BiVO4 surface. This study provides insight into the rational design of a solid-state Z-scheme photocatalyst using facet-controlled nanoparticles to enhance photocatalytic activity.

Graphical abstract: Visible-light-induced water splitting on a hierarchically constructed Z-scheme photocatalyst composed of zinc rhodium oxide and bismuth vanadate

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Publication details

The article was received on 21 Dec 2018, accepted on 22 Mar 2019 and first published on 23 Mar 2019


Article type: Paper
DOI: 10.1039/C8TA12316K
Citation: J. Mater. Chem. A, 2019, Advance Article

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    Visible-light-induced water splitting on a hierarchically constructed Z-scheme photocatalyst composed of zinc rhodium oxide and bismuth vanadate

    T. Takashima, N. Moriyama, Y. Fujishiro, J. Osaki, S. Takeuchi, B. Ohtani and H. Irie, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA12316K

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