Hirofumi Yoshikawa

School of Science and Technology, Kwansei Gakuin University
Associate Professor
A03

Research AreasElectrochemistry, Solid-state Physical Chemistry, Coordination Chemistry
Participating Group (2020-2021)

Development of new functions of soft crystal using solid-state electrochemical reactions

Keywords
Metal Organic Framework, Colloidal Nanocrystal, Solid-state Electrochemistry, Optical Property, X-ray Absorption Fine Structure Analyses
Co-Researcher
Co-Researcher: Daisuke Tanaka (School of Science and Technology, Kwansei Gakuin University, Associate Professor)

Research Outline

The solid-state electrochemical reaction consists of the electron transfer from/to the electrode material and the ion diffusion and integration at the electrode interface and in the electrode, caused by applying weak electrical signals of several volts and several milliamperes. While it is the basic principle of electrochemical energy devices such as rechargeable batteries, fuel cells, and so on, it is possible to change physical properties of electrode materials in the viewpoints of fundamental research. So it is important to explore new functions of various materials by using solid-state electrochemical reactions and to find new phenomena and principles. We have realized specific magnetism and conductivity of coordination compounds by insertion/removal of ions and electrons into/from their soft crystalline under solid-state electrochemical reactions. In this research, we attempt to electrochemically control optical properties of designable soft crystals such as luminescent metal organic framework and colloidal nanocrystals.

Control of optical properties of MOF and colloidal nanocrystals by solid-state electrochemistry

By using such ordered soft crystals, it is expected to manipulate optical properties with precise control of the structure and electronic state.

Participating Group (2018-2019)

Optical characteristics control of soft crystals using solid electrochemical reaction

Keywords
Metal Organic Framework, Colloidal Nanocrystal, Solid-state Electrochemistry, Optical Property, X-ray Absorption Fine Structure Analyses
Co-Researcher
Co-Researcher: Daisuke Tanaka(School of Science and Technology, Kwansei Gakuin University, Associate Professor)

Research Outline

The solid-state electrochemical reaction consists of the electron transfer from/to the electrode material and the ion diffusion and integration at the electrode interface and in the electrode, caused by applying weak electrical signals of several volts and several milliamperes. While it is the basic principle of electrochemical energy devices such as rechargeable batteries, fuel cells, and so on, it is possible to change physical properties of electrode materials in the viewpoints of fundamental research. So it is important to explore new functions of various materials by using solid-state electrochemical reactions and to find new phenomena and principles. We have realized specific magnetism and conductivity of coordination compounds by insertion/removal of ions and electrons into/from their soft crystalline under solid-state electrochemical reactions. In this research, we attempt to electrochemically control optical properties of designable soft crystals such as luminescent metal organic framework and colloidal nanocrystals.

Control of optical properties of MOF and colloidal nanocrystals by solid-state electrochemistry

By using such ordered soft crystals, it is expected to manipulate optical properties with precise control of the structure and electronic state.

Publications

Academic papers/reviewed

A03-21

  1. "Reversible control of ionic conductivity and viscoelasticity of organometallic ionic liquids by application of light and heat" Ryo Sumitani, Hirofumi Yoshikawa and Tomoyuki Mochida Chem. Commun., 2020, 56, 6189-6192.
  2. "Porous Metal Organic Frameworks Containing Reversible Disulfide Linkages as Cathode Materials for Li-Ion Batteries" T. Shimizu, H. Wang, D. Matsumura, K. Mitsuhara, T. Ohta and H. Yoshikawa, ChemSusChem, 2020, 13(9), 2256-2263.
  3. "A new design strategy for redox-active molecular assemblies with crystalline porous structures for lithium-ion batteries" K. Nakashima, T. Shimizu, Y. Kamakura, A. Hinokimoto, Y. Kitagawa, H. Yoshikawa and D. Tanaka, Chemical Science, 2020, 11(1), 37-43.

Related Website(s)
Contact
yoshikawah[at]kwansei.ac.jp