Kyushu University Academic Staff Educational and Research Activities Database
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Katsuro Hayashi Last modified date:2018.04.13

Professor / Applied Fine Chemistry
Department of Applied Chemistry
Faculty of Engineering

Graduate School
Undergraduate School
Other Organization

Academic Degree
Ph. D (Engineering)
Country of degree conferring institution (Overseas)
Field of Specialization
Solid State Chemistry, Physical Chemistry, Ceramic Materials
ORCID(Open Researcher and Contributor ID)
Total Priod of education and research career in the foreign country
Outline Activities
Prof. Hayashi’s group covers the field of Applied Inorganic Chemistry, including synthesis of novel functional ceramic materials, and fundamental researches based on solid state chemistry and physics. They are studying not only typical metal oxide-based ceramics but also novel mixed-anion compounds with nitride, hydride, and electride. Their recent interest includes two-dimensional nanosize compounds prepared from metal carbides. Materials functions such as ionic conduction/exchange and dielectric/conductive properties are applied to development of energy storage and electronic devices.

Research: Electroceramics, Novel Batteries, Solid State Chemistry, Physical Chemistry of Solids
Education: Inorganic Chemistry, Inorganic Materials Chemistry, Inorganic Solid State Chemistry, Ceramic Engineering
Research Interests
  • Development of Novel Batteries (e.g. Air Battieries)
    keyword : Sodium, Solid electrolyte, Sodium-sulfer battery, Lithium-air battery, Nanoporous electrode
  • Electronic materials based on element strategy
    keyword : transparent conductor, nanoporous, element strategy, electrode, battery
Academic Activities
1. Katsuro Hayashi, Peter V. Sushko, Yasuhiro Hashimoto, Alexander L. Shluger, Hideo Hosono, Hydride Ions in Oxide Hosts Hidden by Hydroxide Ions, Nature Communications, Article No. 4515-6, 2014.03, The true oxidation state of formally 'H(-)' ions incorporated in an oxide host is frequently discussed in connection with chemical shifts of (1)H nuclear magnetic resonance spectroscopy, as they can exhibit values typically attributed to H(+). Here we systematically investigate the link between geometrical structure and chemical shift of H(-) ions in an oxide host, mayenite, with a combination of experimental and ab initio approaches, in an attempt to resolve this issue. We demonstrate that the electron density near the hydrogen nucleus in an OH(-) ion (formally H(+) state) exceeds that in an H(-) ion. This behaviour is the opposite to that expected from formal valences. We deduce a relationship between the chemical shift of H(-) and the distance from the H(-) ion to the coordinating electropositive cation. This relationship is pivotal for resolving H(-) species that are masked by various states of H(+) ions.
Membership in Academic Society
  • The Solid State Ionics Society of Japan
  • The Chemical Society of Japan
  • The Japan Society fo Applied Physics
  • The Japan Institute of Metals and Materials
  • The Ceramic Society of Japan
Educational Activities
Inorganic Materials Science (Basic Education)
Inorganic Chemistry(Department of Materials Science and Engineering)
Inorganic Materials Chemistry(Department of Materials Science and Engineering)
Inorganic Chemistry A (G30)
Inorganic Solid State Chemistry (Department of Chemistry and Biochemistry, G30)
Ceramic Engineering(Department of Chemistry and Biochemistry)
Physical Properties of Ceramics(Department of Automotive Science)