Issue 17, 2019

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

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

Supplementary files

Article information

Article type
Paper
Submitted
21 Dec 2018
Accepted
22 Mar 2019
First published
23 Mar 2019

J. Mater. Chem. A, 2019,7, 10372-10378

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, 7, 10372 DOI: 10.1039/C8TA12316K

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