报告题目：Development of hydrogen storage materials and multi functionalization of metal hydrides toward carbon neutrality

报告人  ：Takayuki Ichikawa

报告时间：2024年8月14日（星期三）上午9:10

报告地点：大学城校区仁厚里美育基地学术报告厅

主办单位：材料科学与工程学院

报告人简介：

Takayuki Ichikawa was born on April 16, 1974 in Okayama, Japan. In 2002, he obtained a Ph.D from the Graduate School of Biosphere Science, Hiroshima University, in the field of theoretical physics, then immediately he joined the School of Integrated Arts and Sciences, Hiroshima University, as a research associate. At this time, he started research and development in the field of hydrogen energy. In 2003, his affiliation was changed to the Natural Science Center for Basic Research and Development, Hiroshima University. In 2006, he was promoted to associate professor and also moved to the Institute for Advanced Materials Research, Hiroshima University. Then, in 2015, he was moved to the Graduate School of Integrated Arts and Sciences, Hiroshima University. In 2017, he was promoted to Professor and at the same time, moved to Graduate School of Engineering, Hiroshima University. Recently, in 2020, the organization at Hiroshima University was re-constructed and then re-named the Graduate School of Advanced Science and Engineering, Hiroshima University. His research focuses on solid-state hydrogen storage materials in metallic and non-metallic states, Li-ion batteries, ammonia storage materials, and thermochemical hydrogen production. The number of his publications is more than 270, and the total citation is over 6200.

报告摘要：

Our group has focused on various kinds of hydrogen storage materials and explored their various functions for not only hydrogen storage fields but also potential anode materials for all-solid-state Li-ion batteries, functional materials for hydrogen compression, and heat storage. As one of the important hydrogen storage properties, high gravimetric capacity is the first consideration. Thus, we investigated amide-imide materials, magnesium hydride (MgH2), and ammonia (NH3) as the hydrogen carriers. These materials reveal more than 5 wt% of gravimetric H2 storage amount, Specially, amide-imide, MgH2, and NH3 respectively showed that more than 5 wt% reversible hydrogen absorption and desorption below 150 °C, quick hydrogen absorption with more than 5 wt % at room temperature, and hydrogen desorption from NH3 with 5wt % at room temperature. On the other hand, because magnesium hydride has high theoretical Li storage capacity, relatively low volume expansion, and suitable working potential with very small polarization by the “hydride conversion reaction” for Li-ion batteries, the thermodynamic relationship between battery properties and hydrogen storage properties have been investigated deeply by our group. Moreover, hydrogen production from renewable energies is also quite an important technology to be developed with a reasonable cost (in Japan, the target cost for hydrogen production is about 2 USD/kg). To achieve this economic requirement, a thermochemical method to produce hydrogen is attracting significant attention. The reaction cycles for water-splitting based on redox reactions of the metallic phase of Na are focused on by our group, which is composed of three reactions: hydrogen generation by solid-liquid reaction, metal separation by thermolysis, and oxygen generation by hydrolysis. This novel thermochemical cycle was inspired by research and development of hydrogen storage materials. By further developing this reaction and linking it to large-scale production, we are confident that it can be used in the future for mass production. In summary, our research activities involve the development of advanced technologies for energy storage and conversion. We hope we can contribute to the construction of a clean hydrogen energy society with zero CO2 emissions.