Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Ken Sakai Last modified date:2019.05.14

Professor / Inorganic and Analytical Chemistry / Department of Chemistry / Faculty of Sciences


Presentations
1. 酒井 健, Molecular Catalysts and Photocatalysts for Solar Energy Conversion and Storage, 2nd Kyushu-Mainz Joint Chemistry Symposium, 2019.01.
2. Ken Sakai, Molecular Catalysts and Photocatalysts towards Artificial Photosynthesis, 東京大学理学部化学教室雑誌会セミナー(Department Seminer), 2018.12, In order to achieve practically useful artificial photosynthetic devices, we still need to gain deeper knowledge and skills in handling the basic chemical reactions catalyzed or photocatalyzed by transition metal based molecular systems. Our studies involve new materials synthesis, structure analysis, reaction kinetics, electrocatalysis, photocatalysis, DFT calculations, and so on. The presentation will focus on our recent advancements in clarifying the mechanism of some important energy-related molecular catalysis, such as hydrogen evolution, oxygen evolution, and even carbon dioxide reduction. The development of hybrid molecular devices consisting of multiple molecular components will also be discussed..
3. Ken Sakai, Coordination Chemistry focused on Photochemical Water Splitting Molecular Devices, 43rd International Conference on Coordination Chemistry(ICCC2018), 2018.07.
4. Ken Sakai, Water Oxidation and CO2 Reduction Catalyzed by Co-, Cu- and Ru-Centered Catalysts including Cobalt Porphyrins, Tenth International Conferernce on Porphyrins and Phthalocyanines(ICPP-10), 2018.07, [URL], Please refer to the attached sheet..
5. Ken Sakai, 「Catalytic Hydrogen Evolution Reactions Coupled with Proton-Coupled Electron Transfer Processes」, 3rd Interntational Conference on Proton Coulpled Electron Transfer (PCET2018), 2018.06, [URL], Please refer to the attached sheet..
6. Ken Sakai, Hybrid Molecular Catalysts and Photocatalysts for Solar Water Splitting
Reactions
, 3rd Japan - UK Joint Symposium on Coordination Chemistry, 2018.04, [URL], The chemistry of water oxidation and reduction has been extensively studied from many
viewpoints due to their significant relevance to solve the problems arising from the global
warming and the shortage of fossil fuels. For both processes, proton-coupled electron
transfer (PCET) processes have been considered to play the central role in drastically
lowering the activation barriers for the relevant elementally steps. In the past decades, our
group has paid specific interest in clarifying the mechanisms of transition-metal-based
molecular catalysis for both processes [1-6]. In this presentation, some PCET processes that
govern the rate of catalytic water reduction to evolve dihydrogen from water are discussed.
The figure shown below illustrates that transition-metal-catalyzed water reduction can be
roughly considered to undergo through three different types of PCET-based ratedetermining
steps. The first metal-centered model is the case where the anti-bonding orbital
in the square planar complex like a Pt(II) system forms a hydridoplatinum(III) intermediate
[1,2,5]. This path will was also shown to undergo via formation of a diplatinum(II,III)
interemediate due to its favorable stabilization via the Pt-Pt bond formation. An exceptional
case is a Co NHC catalyst, for which metal-centered PCET occurs upon reduction of Co(II)
d
7
leading to protonation at a Co(I) d8
system [4], implying that the dz2 filled orbital
provides basicity strong enough to promote protonation at the metal center. Our recent
studies also demonstrated some unique hydride forming paths in which ligand-based
reductions coupled with protonation at the ligand geometries can lead to metal hydride
intermediate species required to catalyze hydrogen evolution from water [5,6].
References
1. Sakai, K.; Ozawa, H., Coord. Chem. Rev., 2007, 251, 2753.
2. Ogawa, M. Ajayakumar, G.; Masaoka, S.; Kraatz, H.-B.; Sakai, K., Chem. Eur. J., 2011,
17, 1148.
3. Kimoto, A.; Yamauchi, K.; Yoshida, M.; Masaoka, S.; Sakai, K., Chem. Commun., 2012,
48, 239.
4. Kawano, K.; Yamauchi, K.; Sakai, K., Chem. Commun., 2014, 50, 9872.
5. Yamauchi, K.; Sakai, K., Dalton Trans., 2015, 44, 8685.
6. Koshiba, K.; Yamauchi, K.; Sakai, K., Angew. Chem. Int. Ed., 2017, 56, 424.
7. Ken Sakai, Molecular Design and Control of Transition Metal Complexes and Their Hybrids for Photocatalytic Water Oxidation and Reduction, The 2018 Gordon Research Conference, 2018.01.
8. Ken Sakai, Molecular Catalysts and Photocatalysts towards Solar Energy Conversion and Storage, 11th Japan-China Joint Symposium on Metal Cluster Compounds, 2017.10.
9. Ken Sakai, Molecular Catalysts and Photocatalysts for Water Oxidation and Reduction, The 2nd Japan-US Bilateral Meeting on Coordination Chemistry, 2017.09.
10. Arnau Call,Mihaela Cibian,Keiya Yamamoto,Takashi Nakazono,Ken Sakai, Photocatalytic CO2 reduction catalyzed by watersoluble cobalt porphyrins, 錯体化学会第67回討論会, 2017.09.
11. Keita Koshiba,Kosei Yamauchi,Ken Sakai, Mechanistic Studies on the Electrochemical Hydrogen Evolution Catalyzed by Nickel(II) Dithiolates, 錯体化学会第67回討論会, 2017.09.
12. Keiya Yamamoto,Arnau Call,Mihaela Cibian,Ken Sakai, Photochemical and electrochemical CO2 reduction in aqueous media catalyzed by metal complexes
having CO2 capturing moieties, 錯体化学会第67回討論会, 2017.09.
13. Ken Sakai, Molecular Catalysts and Photocatalysts for Water Oxidation and Reduction, APCC2017, 2017.07.
14. Ken Sakai, Molecular Photocatalysts for Solar Water Splitting, ISPPCC2017, 2017.07.
15. Ken Sakai, Single-Molecular Hybrid Photocatalysts towards Solar Water Splitting Devices, 2017NAGC/ CTMNM Workshp, 2017.05.
16. 酒井 健, Hydrogen Production from Water Photocatalyzed by
Platinum-based Hybrid Molecular Systems, 9th Singapore International Chemistry Conference(SICC9), 2016.12.
17. 酒井 健, Hybrid Molecular Photocatalysts for Hydrogen Generation from Water, 9th Asian and Oceanian Photochemistry Conference(APC2016), 2016.12.
18. 酒井 健, Molecular Catalysts and Photocatalysts for Solar Water Splitting Reactions, Dublin City University, Trinity College Dublin, University of Cork, University of Limerick, NUI Galway, 2016.11.
19. 酒井 健, Molecular catalysts and photocatalysts towards solar water splitting reactions, Inorganic Chemistry Symposium, 2016.10.
20. 酒井 健, Hybrid Molecular Photocatalysts for Hydrogen Generation from Water, 5th International Symposium on Solar Fuels and Solar Cells (5th SFSC), 2016.10.
21. Yuta Tsubonouchi,Shu Lin,Alexander R. Parent,Kosei Yamauchi,Gary W. Brudvig,Ken Sakai, Photochemical water oxidation by an oxido-bridged triruthenium complex, 錯体化学会第66回討論会, 2016.09.
22. Shu Lin,Ken Sakai, Visible-Light driven hydrogen evolution catalyzed by some mononuclear and dinuclear chloro(terpyridine)platinum(II) derivatives with various electron donating motifs, 錯体化学会第66回討論会, 2016.09.
23. Ken Kawano,Kosei Yamauchi,Ken Sakai, Photochemical, Electrochemical and Thermal H2 Evolution Catalyzed by Cobalt-NHC and Related Cobalt-Based Complexes, 錯体化学会第66回討論会, 2016.09.
24. Keiya Yamamoto,Ken Sakai, Development of new single-molecular multi-electron-storage systems: Effects of the Distance between Ru Chromophore and Viologen Accepters, 錯体化学会第66回討論会, 2016.09.
25. Kosei Yamauchi,Keita Koshiba,Ken Sakai, Mechanistic studies on hydrogen evolution from water catalyzed by metal complexes with low overpotential, 錯体化学会第66回討論会, 2016.09.
26. Masayuki Miyaji,Kyoji Kitamoto,Hironobu Ozawa,Ken Sakai, Investigation on the photosynthetic H2-evolving reaction from water catalyzed by Pt(II)-based molecular devices, 錯体化学会第66回討論会, 2016.09.
27. 酒井 健, Hybrid Molecular Systems for Photocatalytic Water Oxidation and Reduction, 42nd edition of the International Conference on Coordination Chemistry (ICCC2016), 2016.07.
28. 酒井 健, Molecular Catalysts and Photocatalysts for Water Splitting Reactions, Japan-Ireland joint seminar "Design and Characterization of Advanced Materials", 2016.06.
29. 酒井 健, Hybrid Molecular Photocatalysts for Hydrogen Generation from Water, UK-Japan Solar Driven Fuel Synthesis Workshop, 2016.06.
30. 酒井 健, Hybrid Molecular Catalysts towards Solar Driven Water Splitting Reactions, 2nd International Symposium on Chemical Energy Conversion Processes (ISCECP-2), 2016.05.
31. 酒井 健, Photocatalytic Water Splitting with Hybrid Molecular Systems, 26th IUPAC International Symposium on Photochemistry, 2016.04.
32. 酒井 健, Hybrid and Non-hybrid Molecular Catalysts for Solar-driven Water Splitting Reactions, City University of Hong Kong, 2016.03.
33. 酒井 健, Molecular Catalysts for Photochemical and Electrochemical Water Oxidation and Reduction, Sun Yat-Sen University, 2016.03.
34. 酒井 健, Molecular Photocatalysts and Electrocatalysts Towards Solar-driven Water Splitting, Institute of Chemical Research of Catalonia (ICIQ), 2016.03.
35. 酒井 健, Improving Robustness and TOF of Cobalt Porphyrin Water Oxidation Catalysts, 2nd Molecules and Materials for Artificial Photosynthesis Conference, 2016.02.
36. 酒井 健, Photo-driven charge storage coupled with catalytic water reduction to hydrogen, Pacifichem2015, 2015.12.
37. Keiya Yamamoto, Kyoji Kitamoto, 酒井 健, Z-scheme photosynthesis for H2 evolution from water forming a three-electron-reduced species, Pacifichem2015, 2015.12.
38. Fumiaki Wakiyama, 山内 幸正, 酒井 健, Kinetic studies of Pt(II)-catalyzed H2 evolution revealing the formation of diplatinum intermediates, Pacifichem2015, 2015.12.
39. Ryota Terao, Takashi Nakazono, Alexander Parent, 酒井 健, Photochemical water oxidation catalyzed by a water soluble copper phthalocyanine derivative, Pacifichem2015, 2015.12.
40. Takashi Nakazono, Alexander Parent, 酒井 健, Improving stability during photoinduced water oxidation catalysis by cobalt porphyrins, Pacifichem2015, 2015.12.
41. Shintaro Nakashima, 山内 幸正, 酒井 健, Development of molecular catalysts for hydrogen evolution using a one-step two-electron reduction
scheme, Pacifichem2015, 2015.12.
42. Kosuke Miyazaki, Kyoji Kitamoto, 山内 幸正, 酒井 健, Hydrogen evolution from water catalyzed by nickel(II) pyridinethiolate complexes having
oligopeptide residues, Pacifichem2015, 2015.12.
43. Ken Kawano, 山内 幸正, 酒井 健, Photochemical hydrogen evolution from water catalyzed by cobalt-NHC complexes under low
driving forces, Pacifichem2015, 2015.12.
44. Keita Koshiba, 山内 幸正, Mijoy Huynh, Sharon Hammes-Schiffer, 酒井 健, Studies on electrochemical hydrogen evolution from water catalyzed by bis(dithiolato)nickelate(II)
complexes, Pacifichem2015, 2015.12.
45. Kyoji Kitamoto, 酒井 健, Molecular photo-charge-separators enabling single-pigment-driven multi-electron storage leading to
catalytic hydrogen evolution, Pacifichem2015, 2015.12.
46. 酒井 健, Molecular Catalysts for Ni,Co,Rh,Pt-based H2 Evolution and Ru,Co-based O2 Evolution, Pacifichem2015, 2015.12.
47. 酒井 健, Molecular Catalysts for Solar-driven Water Splitting Reactions, 25th Annual Meeting of MRS-J (2015), 2015.12.
48. 酒井 健, Hybrid Molecular Photocatalysts Driving H2 Evolution from Water, 10th China-Japan Joint Symposium on Metal Cluster Compounds(CJSMCC-2015), 2015.10.
49. 酒井 健, Molecular Catalysis for Water Oxidation and Reduction, 2nd Japan-Germany Joint Symposium on Coordination Chemistry (JGJSCC2), 2015.09.
50. 酒井 健, Co-based molecular water oxidation catalysts, 250th ACS National Meeting & Exposition, 2015.08.
51. 酒井 健, Hybrid Molecular Catalysts for Solar-driven Water Splitting, 5th Asian Conference on Coordination Chemistry (ACCC5), 2015.07.
52. 酒井 健, Platinum-based Molecular Photocatalysts Driving Hydrogen Evolution from Water, University of Calgary, 2015.06.
53. 酒井 健, Molecular Catalysts for Photochemical Water Oxidation and Reduction, University of Montreal, 2015.06.
54. 酒井 健, Multifunctional Molecular Devices Enabling Photocatalytic Hydrogen Evolution from Water, 98th Canadian Chemistry Conference and Exhibition(CSC2015) , 2015.06.
55. 林 樹, 北本 享司, 山内 幸正, 酒井 健, Photocatalyzed Hydrogen Evolution from Water by an Acceptor-Inducted Platinum(II)-Terpyridine Complex, 日本化学会第95春季年会, 2015.03.
56. 酒井 健, Molecular Catalysts and Devices for Artificial Photosynthesis, MANA国際シンポジウム2015, 2015.03.
57. 酒井 健, Molecular Devices for Photodriven Water-Splitting Reactions, 13th Eurasia Conference on Chemical Science, 2014.12.
58. 酒井 健, Multifunctional molecular devices for photoinduced hydrogen evolution from water, ICARP2014, 2014.11.
59. Masayuki Miyaji, Kyoji Kitamoto, 酒井 健, A NEW RuPt-BASED PHOTO-HYDROGEN-EVOLVING MOLECULAR DEVICE TETHERED TO AN ELECTRON RESORVOIR UNIT, ICARP2014, 2014.11.
60. Alexander Rene Parent, Takashi Nakazono, 酒井 健, MECHANISTIC STUDY OF NON-HEME IRON WATER OXIDATION CATALYSTS, ICARP2014, 2014.11.
61. Keiya Yamamoto, Kyoji Kitamoto, 酒井 健, DEVELOPMENT OF PHOTO-OXYGEN-EVOLVING MOLECULAR SYSTEMS BASED ON TRIS(2,2’-BIPYRIDINE)RUTHENIUM(II) DERIVATIVES TETHERED TO MULTI-ELECTRON-STORAGE MOIETIES, ICARP2014, 2014.11.
62. Keita Koshiba, 山内 幸正, 酒井 健, ELECTROCHEMICAL HYDROGEN PRODUCTION FROM WATER CATALYZED BY BIS(DITHIOLATO)NICKELATE(II) COMPLEXES, ICARP2014, 2014.11.
63. Shu Lin, Kyoji Kitamoto, 山内 幸正, 酒井 健, PLATINUM(II)-TERPYRIDINE COMPLEXES TETHERED TO A VIOLOGEN UNIT AS PHOTOCATALYSTS FOR HYDROGEN EVOLUTION FROM WATER, ICARP2014, 2014.11.
64. 酒井 健, Light-Driven Water Splitting to Dioxygen and Dihydrogen Photocatalyzed by Transition Metal Complexes, International Symposium on Green/Life Innovation, 2014.09.
65. 山内 幸正, 酒井 健, Photochemical Hydrogen Production from Water Catalyzed by Robust Molecular Catalysts, Post-Symposium of ICCC-41, 2014.07.
66. Kyoji Kitamoto, 酒井 健, Molecular Devices Capable of Storing Multi-electrons and Their Application to Photochemical Hydrogen from Water, Post-Symposium of ICCC-41, 2014.07.
67. Takashi Nakazono, Alexander Rene Parent, 酒井 健, Water Oxidation Catalysis by Water-Soluble Cobalt Porphyrins, Post-Symposium of ICCC-41, 2014.07.
68. 酒井 健, Photosynthetic Molecular Devices for Hydrogen Generation from Water, Post-Symposium of ICCC-41, 2014.07.
69. 山内 幸正, Ken Kawano, 酒井 健, H2 Evolution Catalysis Driven with Low Driving Forces, International Conference on Coordination Chemistry (ICCC-41), 2014.07.
70. Kyoji Kitamoto, 酒井 健, Photochemical Hydrogen Evolution from Water Catalyzed by Pigment-Acceptor-Catalyst Triads, International Conference on Coordination Chemistry (ICCC-41), 2014.07.
71. Takashi Nakazono, Alexander Rene Parent, 酒井 健, Water Oxidation Catalysis by Cobalt Tetra Phenyl Porphyrins and The Derivatives, International Conference on Coordination Chemistry (ICCC-41), 2014.07.
72. Alexander Rene Parent, Satoshi Utsunomiya, Takashi Nakazono, Shu Lin, 酒井 健, Mechanism of Water Oxidation by Non-Heme Iron Complexes when Driven with Sodium Periodate, International Conference on Coordination Chemistry (ICCC-41), 2014.07.
73. 酒井 健, Molecular Photocatalysis For Water Splitting Reactions, International Conference on Coordination Chemistry (ICCC-41), 2014.07.
74. 酒井 健, Transition metal complexes for water splitting reactions, the 97th Canadian Chemistry Conference and Exhibition, 2014.06.
75. 酒井 健, Molecular Catalysts and Devices Driving Photoinduced Water Splitting Reactions, the 97th Canadian Chemistry Conference and Exhibition, 2014.06.
76. 酒井 健, Artificial Photosynthesis based on Molecular Photocatalysis of Water Splitting to Dihydrogen and Dioxygen, Nanomaterials for Alternative Energy Applications, 2014.05.
77. 酒井 健, Molecular Catalysts and Devices Driving Photoinduced Water Splitting Reactions, E-MRS 2014 SPRING MEETING, 2014.05.
78. 酒井 健, Molecular Catalysts and Devices for Photoinduced Water Splitting, Scottish Dalton Meeting, 2014.03.
79. 酒井 健, Molecular Catalysts and Devices for Photoinduced Water Splitting, Scottish Dalton Meeting, 2014.03.
80. 酒井 健, Molecular Catalysts and Devices for Photoinduced Water Splitting, European Symposium on Current Challenges in Supramolecular Photocatalytic Water Splitting, 2014.03.
81. 酒井 健, 河野 健, Photochemical Reduction of water into Hydrogen Catalysed by a Macrocyclic Cobalt Complex, European Symposium on Current Challenges in Supramolecular Photocatalytic Water Splitting, 2014.03.
82. 酒井 健, 北本 享司, Photochemical Hydrogen Evolution from Water Catalyzed by PtCl2(bpy) Derivatives Tethered to Multi-Viologen Acceptors, European Symposium on Current Challenges in Supramolecular Photocatalytic Water Splitting, 2014.03.
83. 酒井 健, Molecular Catalysts for Water Splitting, Young-Researcher-Meeting in Supramolecular Photocatalytic Water Splitting, 2014.03.
84. 酒井 健, MOLECULAR CATALYSTS AND DEVICES FOR PHOTOINDUCED WATER SPLITTING, the Molecules and Materials for Artificial Photosynthesis Conference, 2014.02.
85. 酒井 健, Water splitting reactions both thermally and photo chemically catalyzed by transition-metal based molecular systems, the 2014 International Conference on Hydrogen Production, 2014.02.
86. 酒井 健, Molecular Catalysts and Devices for Photo-Induced Water Splitting, 2nd Japan-France Coordination Chemistry Symposium 2013, 2013.11.
87. 北本享司, 酒井 健, Photoinduced multiple charge storage and enhanced hydrogen evolution from water using the dendritic Ru(bpy)32+-viologen dyads, 4th Asian Conference on Coordination Chemistry (ACCC4), 2013.11.
88. 山内 幸正, 酒井 健, Photochemical Hydrogen Production from Water Promoted by Water-Soluble Platinum(II) Terpyridine Complexes, 4th Asian Conference on Coordination Chemistry (ACCC4), 2013.11.
89. PARENT ALEXANDER RENE, 中薗孝志, 酒井 健, Mechanism of Water Oxidation by Fe(TPA) Analogues Using Sodium Periodate, 4th Asian Conference on Coordination Chemistry (ACCC4), 2013.11.
90. 酒井 健, Photoinduced Hydrogen Evolution from Water using Ru(II),Pt(II)-Centered Molecular Photocatalysts, 4th Asian Conference on Coordination Chemistry (ACCC4), 2013.11.
91. 中薗孝志, PARENT ALEXANDER RENE, 酒井 健, Photochemical Oxygen Production from Water Catalyzed by Cobalt Porphyrins, 4th Asian Conference on Coordination Chemistry (ACCC4), 2013.11.
92. PARENT ALEXANDER RENE, 酒井 健, Mechanism of Water Oxidation by Iron TPA Complexes using Periodate, 錯体化学会第63回討論会, 2013.11.
93. 酒井 健, Molecular Catalysis for Light-Induced Water Splitting Reactions, 2nd Canada–Japan Joint Symposium on Coordination Chemistry, 2013.11.
94. PARENT ALEXANDER RENE, 中薗孝志, 酒井 健, DFT MECHANISTIC STUDY OF COBALT PORPHYRIN WATER OXIDATION CATALYSTS, 20th International Symposium on the Photophysicsand Photochemistry of Coordination Compounds (ISPPCC), 2013.07.
95. 山内 幸正, 酒井 健, Photochemical Hydrogen Production from Water Promoted by Robust Platinum(II) Molecular Catalysts, 1st International Symposium on Chemical Energy Conversion Processes (ISCECP-1), 2013.06.
96. 宮地勝将, 北本享司, 酒井 健, A New Ru-Pt Complex as Photo-Hydrogen-Evolving Molecular Device, 1st International Symposium on Chemical Energy Conversion Processes (ISCECP-1), 2013.06.
97. 酒井 健, Molecular Catalysis for Solar Light-induced Water Splitting Reactions towards Development of Artificial Photosynthesis, 1st International Symposium on Chemical Energy Conversion Processes (ISCECP-1), 2013.06.
98. 酒井 健, Photocatalysis of molecular systems in water splitting reactions, ACS meeting 2013, 2013.04.
99. Theoretical and experimental studies on the photochemical hydrogen generation catalyzed by mononuclear platinum(II) complexes with relatively high ligand fields..