Cobalt Oxide Nanoclusters on Rutile Titania as Bifunctional Units for Water Oxidation Catalysis and Visible Light Absorption: Understanding the Structure-Activity Relationship

Kazuhiko Maeda; Koki Ishimaki; Megumi Okazaki; Tomoki Kanazawa; Daling Lu; Shunsuke Nozawa; Hideki Kato; Masato Kakihana

doi:10.1021/acsami.6b15804

Cobalt Oxide Nanoclusters on Rutile Titania as Bifunctional Units for Water Oxidation Catalysis and Visible Light Absorption: Understanding the Structure-Activity Relationship

Kazuhiko Maeda, Koki Ishimaki, Megumi Okazaki, Tomoki Kanazawa, Daling Lu, Shunsuke Nozawa, Hideki Kato, Masato Kakihana

Center for Exploration of New Inorganic Materials

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

The structure of cobalt oxide (CoO_x) nanoparticles dispersed on rutile TiO₂ (R-TiO₂) was characterized by X-ray diffraction, UV-vis-NIR diffuse reflectance spectroscopy, high-resolution transmission electron microscopy, X-ray absorption fine-structure spectroscopy, and X-ray photoelectron spectroscopy. The CoO_x nanoparticles were loaded onto R-TiO₂ by an impregnation method from an aqueous solution containing Co(NO₃)₂·6H₂O followed by heating in air. Modification of the R-TiO₂ with 2.0 wt % Co followed by heating at 423 K for 1 h resulted in the highest photocatalytic activity with good reproducibility. Structural analyses revealed that the activity of this photocatalyst depended strongly on the generation of Co₃O₄ nanoclusters with an optimal distribution. These nanoclusters are thought to interact with the R-TiO₂ surface, resulting in visible light absorption and active sites for water oxidation.

Original language	English
Pages (from-to)	6114-6122
Number of pages	9
Journal	ACS Applied Materials and Interfaces
Volume	9
Issue number	7
DOIs	https://doi.org/10.1021/acsami.6b15804
Publication status	Published - 2017 Feb 22

Keywords

artificial photosynthesis
cobalt
photocatalyst
solar energy conversion
water splitting

ASJC Scopus subject areas

Materials Science(all)

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10.1021/acsami.6b15804

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Maeda, K., Ishimaki, K., Okazaki, M., Kanazawa, T., Lu, D., Nozawa, S., Kato, H., & Kakihana, M. (2017). Cobalt Oxide Nanoclusters on Rutile Titania as Bifunctional Units for Water Oxidation Catalysis and Visible Light Absorption: Understanding the Structure-Activity Relationship. ACS Applied Materials and Interfaces, 9(7), 6114-6122. https://doi.org/10.1021/acsami.6b15804

Cobalt Oxide Nanoclusters on Rutile Titania as Bifunctional Units for Water Oxidation Catalysis and Visible Light Absorption : Understanding the Structure-Activity Relationship. / Maeda, Kazuhiko; Ishimaki, Koki; Okazaki, Megumi; Kanazawa, Tomoki; Lu, Daling; Nozawa, Shunsuke; Kato, Hideki; Kakihana, Masato.

In: ACS Applied Materials and Interfaces, Vol. 9, No. 7, 22.02.2017, p. 6114-6122.

Research output: Contribution to journal › Article › peer-review

Maeda, K, Ishimaki, K, Okazaki, M, Kanazawa, T, Lu, D, Nozawa, S, Kato, H & Kakihana, M 2017, 'Cobalt Oxide Nanoclusters on Rutile Titania as Bifunctional Units for Water Oxidation Catalysis and Visible Light Absorption: Understanding the Structure-Activity Relationship', ACS Applied Materials and Interfaces, vol. 9, no. 7, pp. 6114-6122. https://doi.org/10.1021/acsami.6b15804

Maeda, Kazuhiko ; Ishimaki, Koki ; Okazaki, Megumi ; Kanazawa, Tomoki ; Lu, Daling ; Nozawa, Shunsuke ; Kato, Hideki ; Kakihana, Masato. / Cobalt Oxide Nanoclusters on Rutile Titania as Bifunctional Units for Water Oxidation Catalysis and Visible Light Absorption : Understanding the Structure-Activity Relationship. In: ACS Applied Materials and Interfaces. 2017 ; Vol. 9, No. 7. pp. 6114-6122.

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abstract = "The structure of cobalt oxide (CoOx) nanoparticles dispersed on rutile TiO2 (R-TiO2) was characterized by X-ray diffraction, UV-vis-NIR diffuse reflectance spectroscopy, high-resolution transmission electron microscopy, X-ray absorption fine-structure spectroscopy, and X-ray photoelectron spectroscopy. The CoOx nanoparticles were loaded onto R-TiO2 by an impregnation method from an aqueous solution containing Co(NO3)2·6H2O followed by heating in air. Modification of the R-TiO2 with 2.0 wt % Co followed by heating at 423 K for 1 h resulted in the highest photocatalytic activity with good reproducibility. Structural analyses revealed that the activity of this photocatalyst depended strongly on the generation of Co3O4 nanoclusters with an optimal distribution. These nanoclusters are thought to interact with the R-TiO2 surface, resulting in visible light absorption and active sites for water oxidation.",

keywords = "artificial photosynthesis, cobalt, photocatalyst, solar energy conversion, water splitting",

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