DOI: 10.1246/bcsj.80.2457. Role of Iron Ion Electron Mediator on Photocatalytic Overall Water Splitting under Visible Light Irradiation Using Z-Scheme Systems

Role of Iron Ion Electron Mediator on Photocatalytic Overall Water Splitting under Visible Light Irradiation Using Z-Scheme Systems

10.1246/bcsj.80.2457

Crossref journal-article

Oxford University Press (OUP)

Bulletin of the Chemical Society of Japan (286)

Abstract

Abstract A combination system consisting of a H2 production photocatalyst, Pt/SrTiO3:Rh, and an O2 production photocatalyst, BiVO4 or WO3, decomposed water into H2 and O2 under visible light irradiation in the presence of an Fe3+/Fe2+ redox couple as an electron mediator. O2 evolution on the BiVO4 photocatalyst was inhibited by Fe2+ ions, because of the oxidation of Fe2+ instead of water. In contrast, H2 evolution on the Pt/SrTiO3:Rh photocatalyst was enhanced when Fe3+ ions co-existed. It is due to the back-reactions between H2 and O2 to form water, and the reduction of Fe3+ by H2, which easily proceeded on the bare Pt cocatalyst surface, being efficiently suppressed by adsorption of [Fe(SO4)(H2O)5]+ and/or [Fe(OH)(H2O)5]2+ on the Pt surface. Overall water splitting was achieved with the suppression of the back-reactions even using a Pt cocatalyst. Thus, it clears that iron ions contributed to the present Z-scheme systems not only as an electron mediator but also as an inhibitor of the back-reactions.

Authors 4

Hideki Kato (first)
Yasuyoshi Sasaki (additional)
Akihide Iwase (additional)
Akihiko Kudo (additional)

References 47 Referenced 132

Dates

Type	When
Created	17 years, 8 months ago (Dec. 13, 2007, 12:48 a.m.)
Deposited	1 year, 7 months ago (Jan. 20, 2024, 3:19 p.m.)
Indexed	4 weeks, 2 days ago (Aug. 6, 2025, 9:16 a.m.)
Issued	17 years, 9 months ago (Dec. 1, 2007)
Published	17 years, 9 months ago (Dec. 1, 2007)
Published Online	17 years, 8 months ago (Dec. 13, 2007)
Published Print	17 years, 8 months ago (Dec. 15, 2007)

Funders 0

None

BibTeX

@article{Kato_2007, title={Role of Iron Ion Electron Mediator on Photocatalytic Overall Water Splitting under Visible Light Irradiation Using Z-Scheme Systems}, volume={80}, ISSN={1348-0634}, url={http://dx.doi.org/10.1246/bcsj.80.2457}, DOI={10.1246/bcsj.80.2457}, number={12}, journal={Bulletin of the Chemical Society of Japan}, publisher={Oxford University Press (OUP)}, author={Kato, Hideki and Sasaki, Yasuyoshi and Iwase, Akihide and Kudo, Akihiko}, year={2007}, month=dec, pages={2457–2464} }

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