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(Dec. 16) DOS Engineering for New Green Nano-Materials

Last updated :2019-12-13

Topic: DOS Engineering for New Green Nano-Materials
Speaker: Professor Hiroshi Kitagawa
(Kyoto University)
Host: Professor LI Guangqin
Time: 10:00-11:30, Monday, December 16, 2019
Venue: A101, Fulan Academic Center, Fong Shing Hall, Guangzhou South Campus, SYSU

Professor Hiroshi Kitagawa is a professor of chemistry at Kyoto University in Japan, vice president of Kyoto University, and an internationally renowned nanomaterials chemist. Professor Hiroshi Kitagawa has been committed to the research of molecular conductors, Solid-state protonics using MOFs and SurMOFs, as well as functional nanomaterials. Professor Hiroshi Kitagawa's research group currently has published many papers in top international journals such as Nature, Science, J. Am. Chem. Soc. and Angew. Chem. Int. Ed., has become one of the most influential scientists in the nanomaterial research field. Professor Hiroshi Kitagawa currently serves as a member of the Physical Society of Japan, a foreign member of the Japan Optical Optics Society, steering committees member of Japan Society for Molecular Science, vice president of the Japan Society of Coordination Chemistry, Fellow of the Royal Society of Chemistry (FRSC), and Technical Member of Scientific Research Founding Review Section, Council for Science and Technology, Ministry of Education, Culture, Sports, Science and Technology (MEXT), Scientific Research Specialist Committee of the Japan Society for the Promotion of Science, Science Officer of Research Promotion Bureau, Ministry of Education, Culture, Sports, Science and Technology (MEXT). Professor Hiroshi Kitagawa is the founder in the field of proton conduction in solid media, and pioneered the research direction of non-miscible solid solution alloys in the world. He has also won The Chemical Society of Japan Award for Creative Work (2010), Inoue Prize for Science (2011), Marco Polo della Scienza Italiana (2013), The Commendation for Science and Technology by the Minister of Education, Science & Technology (2016).

The property of element is correlated directly with its electron configuration. In a solid, the density of states (DOS) at the Fermi level affects the physical and chemical properties. The method of alloying elements has been used to improve the properties of materials for many years. In particular, the solidsolution-type alloy is advantageous because tuning the compositions and/or combinations of the constituent elements can continuously control the properties. However, the majority of bulk alloys are of the phase-separated type under ambient conditions, where constituent elements are immiscible with each other. To overcome the challenge of the bulk-phase metallurgical aspects, we have focused on the nanosize effect and developed methods involving “non-equilibrium synthesis” or “a process of hydrogen absorption/desorption”. We propose a new concept of “density-of-states engineering” for the design of materials having the most desirable and suitable properties by means of “inter-element fusion”. Novel solid-solution alloys of Pd-Pt, Ag-Rh, and Pd-Ru systems in which the constituent elements are immiscible in the bulk state are presented and discussed [1-4]. Our present work provides a guiding principle for the design of a suitable DOS shape according to the intended physical and/or chemical properties and a method for the development of novel solid-solution alloys [5-9].

[1] New Aspects of Platinum Group Metal-Based Solid-Solution Alloy Nanoparticles: Binary to High-Entropy Alloys, K. Kusada, D. Wu, H. Kitagawa, Chem. Eur. J., in press. Invited Review.
[2] Recent Progress in the Structure Control of Pd-Ru Bimetallic Nanomaterials, D. Wu, K. Kusada, H. Kitagawa, Science and Technology of Advanced Materials, 17, 583-596 (2016). Invited Review.
[3] A Route for Phase Control in Metal Nanoparticles: A Potential Strategy to Create Advanced Materials, K. Kusada and H. Kitagawa, Advanced Materials, 28, 1129-1142 (2016). Invited Review.
[4] Creation of Novel Solid-Solution Alloy Nanoparticles on the Basis of Density-of-States Engineering by Interelement Fusion, H. Kobayashi, K. Kusada, H. Kitagawa, Accounts of Chemical Research, 48, 1551-1559 (2015). Invited Review.
[5] Selective control of fcc and hcp crystal structures in Au-Ru solid-solution alloy nanoparticles, Q. Zhang, K. Kusada, D. Wu, T. Yamamoto, T. Toriyama, S. Matsumura, S. Kawaguchi, Y. Kubota, H. Kitagawa, Nature Communications, 9, 510 (2018).
[6] Solid-Solution Alloy Nanoparticles of the Immiscible Ir-Cu System with a Wide Composition Range for Enhanced Electrocatalytic Applications, F. Wang, K. Kusada, D. Wu, T. Yamamoto, T. Toriyama, S. Matsumura, Y. Nanba, M. Koyama, H. Kitagawa, Angew. Chem. Int. Ed., 57, 4505-4509 (2018).
[7] Copper Substitution Induced CO Adsorption Site Change of a Ruthenium Catalyst for Highly Enhanced CO Oxidation Activity, B. Huang, H. Kobayashi, T. Yamamoto, T. Toriyama, S. Matsumura, Y. Nishida, K. Sato, K. Nagaoka, M. Haneda, W. Xie, Y. Nanba, M. Koyama, F. Wang, S. Kawaguchi, Y. Kubota, H. Kitagawa, Angew. Chem. Int. Ed., 57, 1-6 (2018).
[8] Emergence of High ORR Activity through Controlling Local Density-of-States by Alloying Immiscible Au and Ir, K. Kusada, D. Wu, T. Yamamoto, T. Toriyama, S. Matsumura, W. Xie, M. Koyama, S. Kawaguchi, Y. Kubota, H. Kitagawa, Chemical Science, 10, 652-656 (2019).
[9] Rational Synthesis Method for a Noble Metal Carbide, T. Wakisaka, K. Kusada, D. Wu, Dongshuang; T. Yamamoto, T. Toriyama, S. Matsumura, H. Akiba, O. Yamamuro,K. Ikeda, T. Otomo, Toshiya; N. Mueller, Y. Chen, L. Kumara, C. Song, O. Sakata, W. Xie, M. Koyama, Y. Kubota, S. Kawaguchi, R. Arevalo, S. Aspera, E. Arguelles, H. Nakanishi, H. Kitagawa, J. Am. Chem. Soc., in press.