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Synthesis and Application of 2D Metal Nanosheets

Two-dimensional (2D) materials have attracted considerable attention owing to their intrinsically large surface areas.  In principle, metal nanosheets with single- and double-atomic layer(s) can utilize 100% of their constituent atoms, resulting high activity. Metal nanosheets may pave a new path for 2D catalysts with excellent activity for energy conversion and storage as well as other practical applications where metal nanoparticles are presently state-of-the-art.

  • Daisuke Takimoto,* Shino Toma, Yuya Suda, Tomoki Shirokura, Yuki Tokura, Katsutoshi Fukuda, Masashi Matsumoto, Hideto Imai, and Wataru Sugimoto,* "Platinum nanosheets synthesized via topotactic reduction of single-layer platinum oxide nanosheets for electrocatalysis", Nat. Commun., 14 19 (2023). DOI

  • ​​​​Wataru Sugimoto* and Daisuke Takimoto, "Platinum Group Metal-based Nanosheets: Synthesis and Application towards Electrochemical Energy Storage and Conversion", Chem. Lett., 50, 1304-1312 (2021).DOI

  • Daisuke Takimoto*, Wataru Sugimoto*, Qiuyi Yuan, Naoki Takao, Takanori Itoh, Truong Vinh Truong Duy, Tsukuru Ohwaki, Hideto Imai*, “Two-Dimensional Effects on the Oxygen Reduction Reaction and Irreversible Surface Oxidation of Metallic Ru Nanosheets and Nanoparticles” ACS Appl. Nano Mater., 2, 5743-5751 (2019). DOI Selected as ACS Editor’s choice

  • Daisuke Takimoto, Tomohiro Ohnishi, Jeerapat Nutariya, Zhongrong Shen, Yusuke Ayato, Dai Mochizuki, Arnaud Demortière, Adrien Boulineau, Wataru Sugimoto*, "Ru-Core@Pt-Shell nanosheet for fuel cell electrocatalysts with high activity and durability" Selected as featured article-January 2017 by Journal of Catalysis, J. Catal., 345, 207-215 (2017). DOI

​Micropore-confined electrochemistry

The slit-shaped micropores have a unique interaction potential profile. These confined spaces afford quasi-high pressures that can induce  physical and chemical properties. Quinone and its derivatives are important redox-active materials, which have been studied as potential electrode materials for various energy storage applications. However, their electrochemical reactions are typically quasi-reversible or irreversible due to the poor electron-transfer kinetics. We recently found that the micropores reportedly play an essential role in obtaining a reversible redox reaction (reversible redox reaction (ΔEp = 0 mV)). In addition, we determined that the AC micropore width required to obtain a reversible redox reaction was in the sub-nanometer scale. Our findings will attract a wide range of readers to your journal as we propose a new technique for the development of useful energy storage devices, and we believe our results will have important implications in the fields of electrochemistry, electronics, energy, and materials science.

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  • Daisuke Takimoto*, Keisuke Suzuki, Sho Hideshima, and Wataru Sugimoto, "Origin of the Adsorption-Controlled Redox Behavior of Quinone-Based Molecules: Importance of the Micropore Width", Electrochemistry, 91(7), 077006 (2023). DOI

  • ​Daisuke Takimoto*, Keisuke Suzuki, Sho Hideshima, and Wataru Sugimoto, "Confinement Effects on the Rate Performance of Redox Active Molecules for Pseudocapacitive Flowable Electrodes", Electrochemistry, 91(4), 047005 (2023). DOI

  • Daisuke Takimoto*,  Keisuke Suzuki,  Ryusuke Futamura,  Taku Iiyama,  Sho Hideshima, and Wataru Sugimot, "Zero-Overpotential Redox Reactions of Quinone-Based Molecules Confined in Carbon Micropores", ACS Applied Materials & Interfaces, 14(27),　31131-31139 (2022). DOI

 

Staff

Daisuke Takimoto, Assistant Professor

E-mail: daitaki"at"sci.u-ryukyu.ac.jp

    

Technical Staff
S. Toma

M. Kosaka

M. Kato

Students
Graduate Students (Master course 1)
Under-Graduate Students (3)

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