NDLI: Particulate photocatalyst sheets for Z-scheme water splitting: advantages over powder suspension and photoelectrochemical systems and future challenges

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Particulate photocatalyst sheets for Z-scheme water splitting: advantages over powder suspension and photoelectrochemical systems and future challenges

Laser-flash-photolysis-spectroscopy: a nondestructive method?

In situ spectroscopic monitoring of CO₂ reduction at copper oxide electrode

Novel photocatalysts: general discussion

Catalysis for fuels: Concluding Remarks

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Faraday Discussions Vol -99

Particulate photocatalyst sheets for Z-scheme water splitting: advantages over powder suspension and photoelectrochemical systems and future challenges

Content Provider	Royal Society of Chemistry (RSC)
Author	Hisatomi, Takashi Katayama, Masao Minegishi, Tsutomu Kudo, Akihiko Domen, Kazunari Yamada, Taro Wang, Qian Takata, Tsuyoshi
Copyright Year	2017
Abstract	Water splitting using semiconductor photocatalysts has been attracting growing interest as a means of solar energy based conversion of water to hydrogen, a clean and renewable fuel. Z-scheme photocatalytic water splitting based on the two-step excitation of an oxygen evolution photocatalyst (OEP) and a hydrogen evolution photocatalyst (HEP) is a promising approach toward the utilisation of visible light. In particular, a photocatalyst sheet system consisting of HEP and OEP particles embedded in a conductive layer has been recently proposed as a new means of obtaining efficient and scalable redox mediator-free Z-scheme solar water splitting. In this paper, we discuss the advantages and disadvantages of the photocatalyst sheet approach compared to conventional photocatalyst powder suspension and photoelectrochemical systems through an examination of the water splitting activity of Z-scheme systems based on SrTiO3:La,Rh as the HEP and BiVO4:Mo as the OEP. This photocatalyst sheet was found to split pure water much more efficiently than the powder suspension and photoelectrochemical systems, because the underlying metal layer efficiently transfers electrons from the OEP to the HEP. The photocatalyst sheet also outperformed a photoelectrochemical parallel cell during pure water splitting. The effects of H+/OH− concentration overpotentials and of the IR drop are reduced in the case of the photocatalyst sheet compared to photoelectrochemical systems, because the HEP and OEP are situated in close proximity to one another. Therefore, the photocatalyst sheet design is well-suited to efficient large-scale applications. Nevertheless, it is also noted that the photocatalytic activity of these sheets drops markedly with increasing background pressure because of reverse reactions involving molecular oxygen under illumination as well as delays in gas bubble desorption. It is shown that appropriate surface modifications allow the photocatalyst sheet to maintain its water splitting activity at elevated pressure. Accordingly, we conclude that the photocatalyst sheet system is a viable option for the realisation of efficient solar fuel production.
Starting Page	491
Ending Page	504
Page Count	14
File Format	HTM / HTML PDF
ISSN	13596640
Volume Number	197
Journal	Faraday Discussions
DOI	10.1039/c6fd00184j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	OEP Mo Water splitting Semiconductor Solar energy Hydrogen Renewable energy Light-dependent reactions Photocatalytic water splitting Oxygen evolution Photocatalysis Redox Photoelectrochemical cell Oxygen Soap bubble Solar fuel
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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BiVO₄–Ru/SrTiO₃:Rh composite Z-scheme photocatalyst for solar water splitting

A review of metal oxynitrides for photocatalysis

Photocatalytic water splitting under visible light utilizing I₃⁻/I⁻ and IO₃⁻/I⁻ redox mediators by Z-scheme system using surface treated PtO_x/WO₃ as O₂ evolution photocatalyst

Hydrogen Production from Semiconductor-based Photocatalysis via Water Splitting

Achievement of visible-light-driven Z-scheme overall water splitting using barium-modified Ta₃N₅ as a H₂-evolving photocatalyst

Semiconductor-based photocatalysts and photoelectrochemical cells for solar fuel generation: a review

A simplified theoretical guideline for overall water splitting using photocatalyst particles

Recent advances in dye-sensitized semiconductor systems for photocatalytic hydrogen production

Synthesis of highly active rhodium-doped SrTiO₃ powders in Z-scheme systems for visible-light-driven photocatalytic overall water splitting

Particulate photocatalyst sheets for Z-scheme water splitting: advantages over powder suspension and photoelectrochemical systems and future challenges

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