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Research paper : Basic materials research for the development of ubiquitous-energy devices (M. Kohyama et al.)−52−Synthesiology - English edition Vol.2 No.1 (2009) References[1][2][3][4][5][6][7][8][9][10]T. Sakai and T. Kobayashi (eds.): Yubikitasuenerugi no saishin gijutsu (Latest Technology of Ubiquitous Energy Devices), CMC Publishing (2006) (in Japanese).K. Oguro: Research strategy for ubiquitous-energy device technology, Materials Integration, 21(2), 1 (2008) (in Japanese).M. Kohyama, S. Tanaka, K. Okazaki-Maeda and T. Akita: Theoretical studies of the atomic and electronic structure of nano-hetero metal/inorganic material interfaces in collaboration with electron microscopy observations, Mater. Trans., 48, 675-683 (2007).M. Kohyama, S. Tanaka, K. Maeda, T. Akita and K. Tanaka: First-principles calculations of atomic and electronic structures of materials interfaces – approach through collaboration with TEM observation, Kenbikyo, 41(3), 178-184 (2006) (in Japanese).T. Akita, J. Kikkawa and M. Kohyama: Structural analysis of ubiquitous-energy materials using analytical electron microscope, Materials Integration, 21(2), 45-51 (2008) (in Japanese).M. Tabuchi, Y. Nabeshima, M. Shikano, K. Ado, H. Kageyama and K. Tatsumi: Optimizing chemical composition and preparation conditions for Fe-substituted Li2MnO3 positive electrode material, J. Electrochem. Soc., 154, A638-648 (2007).C. Colliex: New trends in STEM-based nano-EELS analysis, J. Electron Microsc., 45, 44-50 (1996).J. Kikkawa, T. Akita, M. Tabuchi, M. Shikano, K. Tatsumi and M. Kohyama: Fe-rich and Mn-rich nanodomains in Li1.2Mn0.4Fe0.4O2 positive electrode materials for Li-ion batteries, Appl. Phys. Lett., 91, 054103 (2007).J. Kikkawa, T. Akita, M. Tabuchi, M. Shikano, K. Tatsumi and M. Kohyama: Coexistence of layered and cubic rocksalt structures with a common oxygen sub-lattice in Li1.2Mn0.4Fe0.4O2 particles: A transmission electron microscopy study, J. Appl. Phys., 103, 104911 (2008).J. Kikkawa, T. Akita, M. Tabuchi, M. Shikano, K. Tatsumi AuthorsMasanori KohyamaPrincipal Scientist in Research Institute for Ubiquitous Energy Devices (UBIQEN) of AIST. He graduated from the master’s course of the University of Tokyo in 1984, and received Doctor of Engineering in 1992 from the University of Tokyo. He joined Government Industrial Research Institute, Osaka, Agency of Industrial Science and Technology (current AIST) in 1985. He became Leader of Interface Science Research Group in Special Division of Green Life Technology, AIST in 2001, and Leader of Material Science Research Group in UBIQEN, AIST in 2004. He is engaged in first-principles calculations of materials interfaces and the development of computer programs of first-principles calculations and collaboration technology between TEM observation and theoretical calculations. For this paper, he leads the discussions on the overall direction of research and conducts the practical research planning and and M. Kohyama: Real-space observation of Li extraction/insertion in Li1.2Mn0.4Fe0.4O2 positive electrode material for Li-ion batteries, Electrochem. Solid-State Lett., 11, A183-A186 (2008).A. Taniguchi, T. Akita, K. Yasuda and Y. Miyazaki: Analysis of electrocatalyst degradation in PEMFC caused by cell reversal during fuel starvation, J. Power Sources, 130, 42-49 (2004).K. Yasuda, A. Taniguchi, T. Akita, T. Ioroi and Z. Siroma: Platinum dissolution and deposition in the polymer electrolyte membrane of a PEM fuel cell as studied by potential cycling, Phys. Chem. Chem. Phys., 8, 746-752 (2006).T. Akita, A. Taniguchi, J. Maekawa, Z. Siroma, K. Tanaka, M. Kohyama and K. Yasuda: Analytical TEM study of Pt particle deposition in the proton-exchange membrane of a membrane-electrode-assembly, J. Power Sources, 159, 461-467 (2006).K. Okazaki, S. Yamakawa, R. Morikawa, T. Akita, S. Tanaka and M. Kohyama: Simulation of growth process of Pt-particle - first-principles calculations, J. Physics: Conference Series, 100, 72044 (2008).S. Yamakawa, K. Okazaki, M. Kohyama and S. Hyodo: Phase-field model for deposition of platinum nanoparticle on graphite, J. Physics: Conference Series, 100, 72042 (2008).M. Haruta: Size- and support-dependency in the catalysis of gold, Catal. Today, 36, 153-166 (1997).K. Okazaki, S. Ichikawa, Y. Maeda, M. Haruta and M. Kohyama: Electronic structures of Au supported on TiO2, Appl. Catal. A, 291, 45-54 (2005).T. Okazawa, M. Fujiwara, T. Nishimura, T. Akita, M. Kohyama and Y. Kido: Growth mode and electronic structure of Au nano-clusters on NiO (001) and TiO2 (110), Surf. Sci., 600, 1331-1338 (2006).T. Akita, M. Okumura, K. Tanaka, M. Kohyama and M. Haruta: Analytical TEM observation of Au nano-particles on cerium oxide, Catal. Today, 117, 62-68 (2006).T. Akita, K. Tanaka, M. Kohyama and M. Haruta: Analytical TEM study on structural changes of Au particles on cerium oxide using a heating holder, Catal. Today, 122, 233-238 (2007).T. Akita, K. Tanaka and M. Kohyama: TEM and HAADF-STEM study of the structure of Au nano-particles on CeO2, J. Mater. Sci., 43, 3917-3922 (2008).[11][12][13][14][15][16][17][18][19][20][21]AcknowledgementsThe case study described in this paper was conducted in cooperation with the researchers of the material development group. For the positive electrode materials in Li-ion batteries, we thank Dr. Mitsuharu Tabuchi, Dr. Masahiro Shikano, and Dr. Kuniaki Tatsumi (Research Institute for Ubiquitous Energy Devices, AIST); for the electrode in fuel cells, Dr. Kazuaki Yasuda (Research Institute for Ubiquitous Energy Devices, AIST); for the gold catalyst, Professor Masatake Haruta (formerly of Research Institute for Green Technology, currently Tokyo Metropolitan University), and Dr. Tadahiro Fujitani (Research Institute for Innovation in Sustainable Chemistry, AIST). We received the support of the New Energy and Industrial Technology Development Organization (NEDO) for the researches of the positive electrode materials in Li-ion batteries and the electrode in fuel cells; the Japan Science and Technology Agency (JST) for the calculation of fuel cell electrodes; and Grant-in-Aid for Scientific Research and JST for the study of gold catalysts. We are grateful to all the people and sections involved.

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