Kyushu University Academic Staff Educational and Research Activities Database
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Yoshihiro Yamazaki Last modified date:2018.12.27

Graduate School
Undergraduate School
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Academic Degree
Country of degree conferring institution (Overseas)
Field of Specialization
Materials Science
Total Priod of education and research career in the foreign country
Outline Activities
Yoshihiro Yamazaki's researches in Advanced Functional Inorganic Materials Research Division focus on the multiple length scale ion, electron and electronic-hole transport characterization in metal oxides aiming for efficient solar-fuel and energy conversions. One of ultimate challenges in materials science is to activate a useful materials fuction for a specific application. In particular, the production of efficient solar fuel in conjunction with inorganic materials makes use of unlimited solar energy even at night. A challenge is to unravel critical material and architectural paramters, in a wide range from sub-nanometer to macroscopic scale, that activate such energy functions.
We combine materials synthesis, electrochemical spectroscopy, mass-spectroscopy, thermogravimetry and in-situ high-temperature solid-state NMR, and correlate them to energy functions in inorganic materials. The research topics include novel catalytic oxides for solar-driven thermochemical fuel production and proton transport in proton-conducting oxide.
Research Interests
  • Our work focuses on the electrochemical characterization of transport in oxides, with the twin objectives of understanding the ionic-electronic defect behaviors and of transforming that understanding into materials development for energy applications. We would like to understand the structure-property relationships, how inorganic materials electrochemically functions, in multiple length scale from sub-nanometer to millimeter, aiming for the drastic enhancement of solar-fuel and energy conversion efficiency and kinetics. Our ultimate goal is, based on materials electrochemistry, to activate any energy functions in oxides.
    keyword : advanced functional inorganic materials, metal oxide, point defect, solar-driven thermochemical water splitting catalyst, proton-conducting solid oxide fuel cell electrolyte
Academic Activities
1. C.K. Yang, Y.Yamazaki, A. Aydin, S.M. Haile, Thermodynamic and kinetic assessments of strontium-doped lanthanum manganites for thermochemical water splitting, J. Mater. Chem. A, 2, 13612-13623, 2014.07.
2. Y.Yamazaki, F. Blanc, Y. Okuyama, L. Buannic, J.C. Lucio-Vega, C.P. Grey, S.M. Haile, Proton trapping in yttrium-doped barium zirconate, Nature Materials, 12, 647-651, 2013.07.
3. Y.Yamazaki, R. Hernandez-Sanchez, S.M. Haile, Cation non-stoichiometry in yttrium-doped barium zirconate: phase behavior, microstructure and proton conductivity, J. Mater. Chem, 20, 8158-8166, 2010.08.
4. Y.Yamazaki, R. Hernandez-Sanchez, S.M. Haile, High total proton conductivity in large-grained yttrium-doped barium zirconate, Chem. Mater, 21, 2755-2762, 2009.05.
5. Y.Yamazaki, P. Babilo, S.M. Haile, Defect chemistry of yttrium-doped barium zirconate: A thermodynamic analysis of water uptake, Chem. Mater, 20, 6352-6357, 2008.09.
1. Y.Yamazaki, Proton trapping in proton-conducting oxide, 17th International Conference on Solid State Protonic Conductors, 2014.09.
2. Y.Yamazaki, Proton diffusion in solid oxide fuel cell electrolytes, International Conference on Diffusion in Materials, 2014.08.
3. Y.Yamazaki, F. Blanc, Y. Okuyama, L. Buannic, C.P. Grey, S.M. Haile, Proton trapping: a guide for proton conducting oxide electrolyte development, International Workshop on Protonic Ceramic Fuel Cells Status & Prospects (PPCC2013 – Prospects Protonic Ceramic Cells), 2013.07.
4. Y.Yamazaki, Novel perovskite catalysts for thermochemical water splitting, The 19th International Conference on Solid State Ionics, 2013.06.