Cobalt Hydroxide Modification of TiO<sub>2</sub> Nanosheets for Visible-Light-Responsive Photocatalysts

To make full use of sunlight for water splitting reactions for hydrogen production, a visible-light-driven photocatalyst was developed by modifying TiO<sub>2</sub> nanosheets with Co(OH)<sub>2</sub>. By adding an aqueous Co(NO<sub>3</sub>)<sub>2</sub>·6H<sub>2</sub>O solution to a TiO<sub>2</sub> nanosheet suspension, the TiO<sub>2</sub> nanosheets aggregated and Co(OH)<sub>2</sub> was formed. In the ultraviolet-visible (UV-vis) diffuse reflectance spectrum of the photocatalyst, new absorption bands attributable to Co(OH)<sub>2</sub> and the interfacial charge transfer between Co(OH)<sub>2</sub> and the TiO<sub>2</sub> nanosheets appeared at around 600 and 400 nm, respectively. The photocatalytic activity of Co(OH)<sub>2</sub>/TiO<sub>2</sub> nanosheets was evaluated in terms of the O<sub>2</sub> evolution reaction in an aqueous AgNO<sub>3</sub> solution, finding that the reaction proceeds under visible light. Furthermore, the investigation of the wavelength dependence of the photocatalytic activity revealed that the photocatalytic reaction on Co(OH)<sub>2</sub>/TiO<sub>2</sub> nanosheets proceeds via Co(OH)<sub>2</sub> photocatalysis and interfacial charge transfer between Co(OH)<sub>2</sub> and the TiO<sub>2</sub> nanosheets under visible light irradiation.

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Publication Details

Journal
ACS Omega
Published
2025-01-16
DOI
https://doi.org/10.1021/acsomega.4c10161
Citations
3
Primary Topic
Advanced Photocatalysis Techniques
Type
article
Field-Weighted Citation Impact
1.09

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article

Cobalt Hydroxide Modification of TiO2 Nanosheets for Visible-Light-Responsive Photocatalysts

Hidehisa Hagiwara, Katsuaki Hayakawa, Kazuto Hatakeyama, Keisuke Awaya et al.
3 citations
ACS Omega
Advanced Photocatalysis Techniques
1.09
article

Cobalt Hydroxide Modification of TiO2 Nanosheets for Visible-Light-Responsive Photocatalysts

Hidehisa Hagiwara, Katsuaki Hayakawa, Kazuto Hatakeyama, Keisuke Awaya, Shintaro Ida, Kazuki Ishitsuka
article en
3 citations

Abstract

To make full use of sunlight for water splitting reactions for hydrogen production, a visible-light-driven photocatalyst was developed by modifying TiO<sub>2</sub> nanosheets with Co(OH)<sub>2</sub>. By adding an aqueous Co(NO<sub>3</sub>)<sub>2</sub>·6H<sub>2</sub>O solution to a TiO<sub>2</sub> nanosheet suspension, the TiO<sub>2</sub> nanosheets aggregated and Co(OH)<sub>2</sub> was formed. In the ultraviolet-visible (UV-vis) diffuse reflectance spectrum of the photocatalyst, new absorption bands attributable to Co(OH)<sub>2</sub> and the interfacial charge transfer between Co(OH)<sub>2</sub> and the TiO<sub>2</sub> nanosheets appeared at around 600 and 400 nm, respectively. The photocatalytic activity of Co(OH)<sub>2</sub>/TiO<sub>2</sub> nanosheets was evaluated in terms of the O<sub>2</sub> evolution reaction in an aqueous AgNO<sub>3</sub> solution, finding that the reaction proceeds under visible light. Furthermore, the investigation of the wavelength dependence of the photocatalytic activity revealed that the photocatalytic reaction on Co(OH)<sub>2</sub>/TiO<sub>2</sub> nanosheets proceeds via Co(OH)<sub>2</sub> photocatalysis and interfacial charge transfer between Co(OH)<sub>2</sub> and the TiO<sub>2</sub> nanosheets under visible light irradiation.

ACS OmegaVol. 10(3)
Kumamoto Industrial Research Institute (JP), University of Toyama (JP), Kumamoto University (JP)
Japan Society for the Promotion of Science
Clean water and sanitation
Openalex Percentile: Top 26%
Advanced Photocatalysis Techniques
1.09
DOIOpen Access PDFOpenAlex
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