RMW16 will be held at Massachusetts Institute of Technology (MIT), USA, from March 24 to 25, 2023. This workshop, initiated by Prof. Toru H. Okabe of our university and Prof. Sadoway of MIT, added me Assoc. Prof. Yagi and Prof. Allanore of MIT as the organizers, and expanded its scope from resources, refining, and recycling to energy materials and devices. This workshop has become a forum for international discussions among university and corporate researchers who are active at the forefront of this field around the world. If you are interested in attending, please contact us.

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The mechanism of catalytic activity of positive electrode active materials for magnesium rechargeable batteries for oxidative and reductive decomposition reactions of electrolyte was comprehensively explained by a combination of experiments and calculations. Based on this mechanism, we proposed one of the design guidelines for positive electrode active materials. This is the result of joint research with Prof. Ichitsubo at Institute for Materials Research, Tohoku University and Prof. Nakayama at Nagoya Institute of Technology.
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We have investigated the effect of ions occupying the tetrahedral sites of spinel oxides on the catalytic activity for oxygen evolution reaction. In particular, we found that dissolution of Zn ions occupying the tetrahedral sites leads to cation defects, which facilitates adsorption of reaction intermediates, thereby enhancing the activity. We also showed that a large amount of cation defects leads to structural instability and lower activity.
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Various types of highly active oxygen evolution oxide catalysts have been reported. However, most of them dissolve in acidic aqueous solutions due to their oxide nature. In this study, in cooperation with Prof. Ikuya Yamada’s Group at Osaka Metropolitan University, we synthesized a quadruple perovskite ruthenium oxide ACu₃Ru₄O₁₂ with high stability in acidic aqueous solutions. Furthermore, we changed the valence of the Cu ion by substituting the A-site cation and clarified the correlation with the catalytic activity for the oxygen evolution reaction, and found that the oxygen evolution reaction proceeds with a dual-site mechanism involving both Ru and Cu.
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Lowering the overvoltage required for the oxygen reduction reaction to proceed is one of the most important themes for the practical application of fuel cells. In this study, we clarified that the overvoltage is significantly lowered by adding Sr to the perovskite oxide LaMnO₃, and elucidated the mechanism of this reduction.
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for organizing a large-scale online seminar and introducing efficient management methods.