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学术报告当前位置: 北京大学化学与分子工程学院学术报告正文
标 题:【无机化学论坛】Perspectives and Challenges of Metal Boranes for Energy Applications
发布时间:2017-04-19 阅读次数:576

报告人: Hai-Wen Li

International Research Center for Hydrogen Energy and International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Motooka Nishi-ku, Fukuoka 819-0395, Japan. E-mail: li.haiwen.305@m.kyushu-u.ac.jp

时间:20170424 15:0016:00

地点:北京大学化学学院A717报告厅.

 

Metal boranes M(BxHy)n have been attracting increasing interest from the energy storage point of view, especially in the context of solid-state hydrogen storage and superionic conductivity. Lower boranes such as metal tetrahydroborate M(BH4)n like LiBH4, Mg(BH4)2 and Ca(BH4)2, with hydrogen gravimetric density higher than 10 mass%, have been extensively investigated for high density hydrogen storage. However, formation of the intermediate compounds comprised of higher boranes such as M2(B12H12)n during the dehydrogenation of M(BH4)n, has been widely regarded as one of the main reasons resulting in the degraded rehydrogenation. M2(B12H12)n with a stable icosahedral cage structure, on the other hand, favours its potential application as superionic conductor. Recently, we found that the ionic conductivity of a bimetallic closo-borane LiNaB12H12 reaches 0.79 S/cm at 550 K above its order-disorder phase transition. This value is 10 times higher than those of its single counterpart of Li2B12H12 and Na2B12H12 at the same temperature. In this paper, we will discuss in detail the role of intermediate compounds on the de/rehydrogenation of M(BH4)n and the diffusion behaviour of cation in M2(B12H12)n, in order to gain insightful information on the development of metal boranes for high density hydrogen storage and solid electrolyte for batteries.

 

Li obtained his Ph. D. degree in 2005 from Kitami Institute of Technology (Japan), under the supervision of Prof. Kiyoshi Aoki. In 2005, he started to work as a postdoctoral researcher with Prof. Shin-ichi Orimo at Institute for Materials Research, Tohoku University. From 2006-2008, he became a JSPS (Japan Society for the Promotion of Science) Research Fellow. In 2008, he was assigned as an assistant professor at Institute for Materials Research, Tohoku University. Since 2011, he works as an associate professor at International Research Center for Hydrogen Energy and International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University. His research interests focus on investigating fundamental, physical and chemical properties of interstitial and non-interstitial hydrides, aiming at developing advanced materials for high-density hydrogen storage and advanced electrochemical applications. His main achievements can be accessed via http://www.researchgate.net/profile/Li_Hai-Wen