A Simple Preparation Method of Reduced Graphene Oxide-Incorporated BiVO4 Loaded with CoOx Composites and Application to Z-Schematic Water Splitting under Visible Light Irradiation

Misa Moriya; Yun Hau Ng; Akihide Iwase

doi:10.1002/ente.202301531

A Simple Preparation Method of Reduced Graphene Oxide-Incorporated BiVO₄ Loaded with CoO_x Composites and Application to Z-Schematic Water Splitting under Visible Light Irradiation

Misa Moriya, Yun Hau Ng, Akihide Iwase^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

2 Citations (Scopus)

17 Downloads (CityUHK Scholars)

Abstract

The construction of Z-scheme systems is an efficient strategy to realize water splitting under visible light irradiation. In particular, various photocatalysts can be employed for Z-scheme systems when a reduced graphene oxide (RGO) is used as an electron mediator. Herein, a simple 1-step process for the preparation of RGO-(CoO_x/BiVO₄) composites is developed. In the developed preparation method, Co ions are oxidized to CoO_x by photogenerated holes in BiVO₄ accompanied by simultaneous reduction of GO to RGO by photoexcited electrons. The developed preparation method is simpler than a conventional method that contains loading with CoO_x by impregnation and subsequent incorporation of RGO by photocatalytic reduction. Z-schematic water splitting under visible light irradiation proceeds when RGO-(CoO_x/BiVO₄) prepared by the 1-step process is combined with Pt/(CuGa)_0.5ZnS₂. Moreover, the developed method is also able to be applied to the preparation of RGO-(FeO_x/BiVO₄) composites. © 2024 The Authors. Energy Technology published by Wiley-VCH GmbH.

Original language	English
Article number	2301531
Journal	Energy Technology
Volume	12
Issue number	6
Online published	23 Mar 2024
DOIs	https://doi.org/10.1002/ente.202301531
Publication status	Published - Jun 2024

Funding

This work was supported by JSPS KAKENHI, grant no. 19H02819.

Research Keywords

cocatalyst
metal sulfide
photocatalysts
reduced graphene oxide
water splitting
Z-scheme systems

Publisher's Copyright Statement

This full text is made available under CC-BY-NC 4.0. https://creativecommons.org/licenses/by-nc/4.0/

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title = "A Simple Preparation Method of Reduced Graphene Oxide-Incorporated BiVO4 Loaded with CoOx Composites and Application to Z-Schematic Water Splitting under Visible Light Irradiation",

abstract = "The construction of Z-scheme systems is an efficient strategy to realize water splitting under visible light irradiation. In particular, various photocatalysts can be employed for Z-scheme systems when a reduced graphene oxide (RGO) is used as an electron mediator. Herein, a simple 1-step process for the preparation of RGO-(CoOx/BiVO4) composites is developed. In the developed preparation method, Co ions are oxidized to CoOx by photogenerated holes in BiVO4 accompanied by simultaneous reduction of GO to RGO by photoexcited electrons. The developed preparation method is simpler than a conventional method that contains loading with CoOx by impregnation and subsequent incorporation of RGO by photocatalytic reduction. Z-schematic water splitting under visible light irradiation proceeds when RGO-(CoOx/BiVO4) prepared by the 1-step process is combined with Pt/(CuGa)0.5ZnS2. Moreover, the developed method is also able to be applied to the preparation of RGO-(FeOx/BiVO4) composites. {\textcopyright} 2024 The Authors. Energy Technology published by Wiley-VCH GmbH.",

keywords = "cocatalyst, metal sulfide, photocatalysts, reduced graphene oxide, water splitting, Z-scheme systems",

author = "Misa Moriya and Ng, {Yun Hau} and Akihide Iwase",

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A Simple Preparation Method of Reduced Graphene Oxide-Incorporated BiVO₄ Loaded with CoO_x Composites and Application to Z-Schematic Water Splitting under Visible Light Irradiation. / Moriya, Misa; Ng, Yun Hau; Iwase, Akihide.
In: Energy Technology, Vol. 12, No. 6, 2301531, 06.2024.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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AU - Ng, Yun Hau

AU - Iwase, Akihide

PY - 2024/6

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N2 - The construction of Z-scheme systems is an efficient strategy to realize water splitting under visible light irradiation. In particular, various photocatalysts can be employed for Z-scheme systems when a reduced graphene oxide (RGO) is used as an electron mediator. Herein, a simple 1-step process for the preparation of RGO-(CoOx/BiVO4) composites is developed. In the developed preparation method, Co ions are oxidized to CoOx by photogenerated holes in BiVO4 accompanied by simultaneous reduction of GO to RGO by photoexcited electrons. The developed preparation method is simpler than a conventional method that contains loading with CoOx by impregnation and subsequent incorporation of RGO by photocatalytic reduction. Z-schematic water splitting under visible light irradiation proceeds when RGO-(CoOx/BiVO4) prepared by the 1-step process is combined with Pt/(CuGa)0.5ZnS2. Moreover, the developed method is also able to be applied to the preparation of RGO-(FeOx/BiVO4) composites. © 2024 The Authors. Energy Technology published by Wiley-VCH GmbH.

AB - The construction of Z-scheme systems is an efficient strategy to realize water splitting under visible light irradiation. In particular, various photocatalysts can be employed for Z-scheme systems when a reduced graphene oxide (RGO) is used as an electron mediator. Herein, a simple 1-step process for the preparation of RGO-(CoOx/BiVO4) composites is developed. In the developed preparation method, Co ions are oxidized to CoOx by photogenerated holes in BiVO4 accompanied by simultaneous reduction of GO to RGO by photoexcited electrons. The developed preparation method is simpler than a conventional method that contains loading with CoOx by impregnation and subsequent incorporation of RGO by photocatalytic reduction. Z-schematic water splitting under visible light irradiation proceeds when RGO-(CoOx/BiVO4) prepared by the 1-step process is combined with Pt/(CuGa)0.5ZnS2. Moreover, the developed method is also able to be applied to the preparation of RGO-(FeOx/BiVO4) composites. © 2024 The Authors. Energy Technology published by Wiley-VCH GmbH.

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