为加强天津理工大学新能源材料与低碳技术研究院国际交流与合作，2019年9月27日，应鲁统部教授邀请，日本九州大学Ken Sakai教授到访我院，并为师生们作了题为“Molecular Catalysis and Photocatalysis for Water Splitting and CO2Reduction”的学术报告。来自新能源材料与低碳技术研究院、材料科学与工程学院及相关学院的师生参加了此次报告会。
Ken Sakai received his B.S. (1987), M.S. (1989), and Ph.D.(1993) from Waseda University working with Kazuko Matsumoto. He was an assistant professor at Seikei University during 1991-1999, an associate professor at Tokyo University of Science during 1999-2004, and has been a full professor at Kyushu University since 2004. He was also appointed as a principal investigator for Kyushu University International Institute for Carbon-Neutral Energy Research (WPI-I2CNER) since 2012. His interests involve study leading to improved understanding of various important catalytic processes together with work aiming at the development of hybrid materials as artificial photosynthetic nanoreactors for solar fuel generation.
Over the past decade, our group has focused on the molecular systems relevant to photosynthetic molecular devices. Our targets involve the studies on (i) water oxidation catalysis in order to uptake protons and electrons required for fuels generation, (ii) catalytic water or CO2reduction into sustainable fuels (i.e., H2, CO, etc.), (iii) artificial light-harvesting systems towards the effective charge separation and/or migration, and so on. In order to develop the more desirable/efficient systems in promoting all relevant processes, substantial efforts have been devoted to more carefully study the reaction kinetics and equilibria in solution that are relevant to each topic. Various techniques have been adopted to better understand the mechanistic aspects relevant to all of our systems. Some of the reaction steps of interest are not observable by any experimental techniques, and must be discussed on the basis of our DFT results, which also greatly helped us understand the mechanism of reactions. Importantly, one of our findings is that, in any catalysis, the reactivity of metal(s) can be rationally tuned by use of redox active ligands that are more or less hybridized with metal(s) in their orbitals. Such issues are often involved in our discussion. One of our interests has concentrated on the molecular Pt-catalyzed hydrogen evolution reactions and their application in fabricating photosensitizer-catalyst hybrid molecular devices. Our recent kinetic and electrochemical studies evidence the formation of a hydridodiplatinum(II,III) intermediate when H2 evolution is catalyzed by a simple mononuclear Pt(bpy)Cl2derivative, which is also rationalized by our DFT results. Our studies have also provided new aspects on photo-induced multi-charge separation, near-infrared-driven water reduction, water oxidation catalysis by monocobalt polymolybdate, Ru(terpy)(bpy)(H2O), and cobalt porphyrin derivatives. Non-precious metal water reduction catalysis using Ni and Co, and cobalt porphyrin CO2reduction catalysis in fully aqueous media have also been focused in our recent studies. Moreover, our recent studies further include photoelectrochemical cells for the overall water splitting based on two mesoporous TiO2films at both the photoanode and the‘dark cathode’tethered to a Pt porphyrin water reduction catalyst .