Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Hironobu Ozawa Last modified date:2023.11.27

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


Papers
1. Hironobu Ozawa, Ryoma Kikunaga, Hajime Suzuki, Ryu Abe, Ken Sakai, Efficient syngas production with controllable CO:H2 ratios based on the aqueous electrocatalytic CO2 reduction over mesoporous TiO2 films modified with a cobalt porphyrin molecular catalyst, Sustainable Energy Fuels, 2023, 7, 1627-1632., 2023.02.
2. Hironobu Ozawa* and Ken Sakai*, Two-Electrode Solar Water Splitting Permitting H2 Separation at a Dark Cathode, AsiaChem, 2021, 2, 80-87., 2021.12.
3. Koichi Yatsuzuka, Kosei Yamauchi*, Ken Kawano, Hironobu Ozawa*, and Ken Sakai*, Improving the Overall Performance of Photochemical H2 Evolution Catalyzed by the Co-NHC Complex via the Redox Tuning of Electron Relays, Sustainable Energy Fuels, 2021, 5, 740-749., 10.1039/D0SE01597K, 2021.02.
4. Katsuhiro Akamine, Kohei Morita, Ken Sakai,* Hironobu Ozawa* , A Molecular-Based Water Electrolyzer Consisting of Two Mesoporous TiO2 Electrodes Modified with Metalloporphyrin Molecular Catalysts Showing a Quantitative Faradaic Efficiency, ACS Appl. Energy Mater., 2020, 3, 4860-4866., 10.1021/acsaem.0c00443, 2020.04, 酸素生成錯体触媒を修飾した二酸化チタン電極、および水素生成錯体触媒を修飾した二酸化チタン電極を作製し、それぞれの触媒機能評価を行った。さらに、これらの修飾電極を用いた分子性電気化学セルによる水の完全分解に初めて成功した。.
5. Kohei Morita, Ken Sakai,* Hironobu Ozawa*, A New Class of Molecular-Based Photoelectrochemical Cell for Solar Hydrogen Production Consisting of Two Mesoporous TiO2 Electrodes, ACS Appl. Energy Mater., 2019, 2, 987-992., 2019.01.
6. Kohei Morita, Kohei Takijiri, Ken Sakai,* Hironobu Ozawa* , A Platinum Porphyrin Modified TiO2 Electrode for Photoelectrochemical Hydrogen Production from Neutral Water Driven by the Conduction Band Edge Potential of TiO2
, Dalton Trans., 2017, 46, 15181-15185. , 10.1039/c7dt03710d, 2017.08.
7. Kohei Takijiri, Kohei Morita, Takashi Nakazono, Ken Sakai,* Hironobu Ozawa* , Highly Stable Chemisorption of Dyes with Pyridyl Anchors over TiO2: Application in Dye-Sensitized Photoelectrochemical Water Reduction in Aqueous Media
, Chem. Commun., 2017, 53, 3042-3045. , 10.1039/c6cc10321a, 2017.03.
8. Masayuki Miyaji, Kyoji Kitamoto, Hironobu Ozawa,* Ken Sakai* , Synthesis and Characterization of a RuPt-Based Photo-Hydrogen-Evolving Molecular Device Tethered to a Single Viologen Acceptor
, Eur. J. Inorg. Chem., 2017, 1237-1244. , 10.1002/ejic.201601346, 2017.01.
9. Shu Lin, Kyoji Kitamoto, Hironobu Ozawa,* Ken Sakai* , Improved Photocatalytic Hydrogen Evolution Driven by Chloro(terpyridine)platinum(II) Derivatives Tethered to a Single Pendant Viologen Acceptor
, Dalton Trans., 2016, 45, 10643-10654. , 10.1039/C6DT01456A, 2016.08.
10. Hironobu Ozawa, Takahito Sugiura, Takahiro Kuroda, Kouya Nozawa, Hironori Arakawa* , Highly Efficient Dye-Sensitized Solar Cells Based on a Ruthenium Sensitizer Bearing a Hexylthiophene Modified Terpyridine Ligand
, J. Mater. Chem. A, 2016, 4, 1726-1770. , 10.1039/C5TA10393B, 2016.03.
11. Hironobu Ozawa, Ayako Urayama, Hironori Arakawa* , Black-Dye-Based Dye-Sensitized Solar Cells using the Electrolyte Solutions Containing a Quaternary Phosphonium Iodide with a Various Alkyl Chain Length
, Electrochim. Acta, 2016, 187, 73-80. , 10.1016/j.electacta.2015.10.191, 2015.10.
12. Hironobu Ozawa, Kei Fukushima, Ayako Urayama, Hironori Arakawa* , Efficient Ruthenium Sensitizer with an Extended π-Conjugated Terpyridine Ligand for Dye-Sensitized Solar Cells
, Inorg. Chem., 2015, 54, 8887-8889. , 10.1021/acs.inorgchem.5b01640, 2015.08.
13. Naoyuki Shibayama, Yukiko Inoue, Masahiro Abe, Shingo Kajiyama, Hironobu Ozawa, Hidetoshi Miura, Hironori Arakawa* , Novel Near-Infrared Carboxylated 1,3-Indandione Sensitizers for Highly Efficient Flexible Dye-Sensitized Solar Cells
, Chem. Commun., 2015, 51, 12795-12798. , 10.1039/c5cc03049h, 2015.06.
14. Hironobu Ozawa, Yasuyuki Yamamoto, Hiroki Kawaguchi, Ryosuke Shimizu, Hironori Arakawa* , Ruthenium Sensitizers with a Hexylthiophene-Modified Terpyridine Ligand for Dye-Sensitized Solar Cells: Synthesis, Photo- and Electrochemical Properties, and Adsorption Behavior to the TiO2 Surface
, ACS Appl. Mater. Interfaces, 2015, 7, 3152-3161. , 10.1021/am507442s, 2015.04.
15. Naoyuki Shibayama, Hironobu Ozawa, Yousuke Ooyama, Hironori Arakawa* , Highly Efficient Cosensitized Plastic-Substrate Dye-Sensitized Solar Cells with Black Dye and Pyridine-Anchor Organic Dye
, Bull. Chem. Soc. Jpn., 2015, 88, 366-374. , 10.1246/bcsj.20140344, 2015.02.
16. Hironobu Ozawa, Yuki Tawaraya, Hironori Arakawa* , Effects of the Alkyl Chain Length of Imidazolium Iodide in the Electrolyte Solution on the Performance of Black-Dye-Based Dye-Sensitized Solar Cells
, Electrochim. Acta, 2015, 151, 447-452. , 10.1016/j.electacta.2014.11.067, 2015.01.
17. Hironobu Ozawa, Takahiro Kuroda, Shohei Harada, Hironori Arakawa* , Efficient Ruthenium Sensitizer with a Terpyridine Ligand Having a Hexylthiophene Unit for Dye-Sensitized Solar Cells: Effects of the Substituent Position on the Solar Cell Performance
, Eur. J. Inorg. Chem., 2014, 4734-4739. , 10.1002/ejic.201402530, 2014.12.
18. Hironobu Ozawa, Takahito Sugiura, Ryosuke Shimizu, Hironori Arakawa* , Novel Ruthenium Sensitizers Having Different Numbers of Carboxyl Groups for Dye-Sensitized Solar Cells: Effects of the Adsorption Manner at the TiO2 Surface on the Solar Cell Performance
, Inorg. Chem., 2014, 53, 9375-9384. , 10.1021/ic501479p, 2014.11.
19. Hironobu Ozawa, Kei Fukushima, Takahito Sugiura, Ayako Urayama, Hironori Arakawa* , Ruthenium Sensitizers Having an Ortho-Dicarboxyl Group as an Anchoring Unit for Dye-Sensitized Solar Cells: Synthesis, Photo- and Electrochemical Properties, and Adsorption Behavior to the TiO2 Surface
, Dalton Trans., 2014, 43, 13208-13218. , 10.1039/c4dt01450b, 2014.10.
20. Naoyuki Shibayama, Hironobu Ozawa, Masahiro Abe, Yousuke Ooyama, Hironori Arakawa* , A New Cosensitization Method using the Lewis Acid Sites of a TiO2 Photoelectrode for Dye-Sensitized Solar Cells
, Chem. Commun., 2014, 50, 6398-6401. , 10.1039/c3cc49461f, 2014.08.
21. Hironobu Ozawa, Yu Okuyama, Hironori Arakawa* , Dependence of the Efficiency Improvement of Black-Dye-Based Dye-Sensitized Solar Cells on Alkyl Chain Length of Quaternary Ammonium Cations in Electrolyte Solutions
, ChemPhysChem, 2014, 15, 1201-1206. , 10.1002/cphc.201301025, 2014.07.
22. Hironobu Ozawa, Shunsuke Honda, Daichi Katano, Takahito Sugiura, Hironori Arakawa* , Novel Ruthenium Sensitizers with a Dianionic Tridentate Ligand for Dye-Sensitized Solar Cells: the Relationship Between the Solar Cell Performances and the Electron-Withdrawing Ability of Substituents on the Ligand
, Dalton Trans., 2014, 43, 8026-8036. , 10.1039/c3dt52873a, 2014.04.
23. Chettiyam Suneesh, Bijitha Balan, Hironobu Ozawa, Yuki Nakamura, Tetsuro Katayama, Masayasu Muramatsu, Yutaka Nagasawa, Hiroshi Miyasaka, Ken Sakai* , Mechanistic Studies of Photoinduced Intramolecular and Intermolecular Electron Transfer Processes in RuPt-Centred Photo-Hydrogen-Evolving Molecular Devices, Phys. Chem. Chem. Phys., 2014, 16, 1607-1616. , 10.1039/c3cp54630f, 2014.02.
24. Hironobu Ozawa, Hiroki Kawaguchi, Yu Okuyama, Hironori Arakawa* , Ruthenium Sensitizers with 2,2'-Bipyrimidine or a 5,5'-Disubstituted 2,2'-Bipyrimidine Ligand: Synthesis, Photo- and Electrochemical Properties, and Application to Dye-Sensitized Solar Cells
, Eur. J. Inorg. Chem., 2013, 5187-5195. , 10.1002/ejic.201300345, 2013.11.
25. Hironobu Ozawa, Yu Okuyama, Hironori Arakawa* , Effects of Cation Composition in the Electrolyte on the Efficiency Improvement of Black Dye-Based Dye-Sensitized Solar Cells
, RSC Adv., 2013, 3, 9175-9177. , 10.1039/c3ra23495a, 2013.09.
26. Hironobu Ozawa, Yasuyuki Yamamoto, Kei Fukushima, Satoshi Yamashita, Hironori Arakawa* , Synthesis and Characterization of a Novel Ruthenium Sensitizer with a Hexylthiophene-Functionalized Terpyridine Ligand for Dye-Sensitized Solar Cells
, Chem. Lett., 2013, 42, 897-899. , 10.1246/cl.130217, 2013.06.
27. Hironobu Ozawa, Shohei Oura, Ryosuke Shimizu, Hironori Arakawa* , Synthesis of a Novel Ruthenium Sensitizer Bearing an Ortho-Dicarboxyphenyl Group as an Anchoring Unit for Dye-Sensitized Solar Cells
, Chem. Lett., 2012, 41, 1406-1408. , 10.1246/cl.2012.1406, 2012.10.
28. Hironobu Ozawa, Yu Okuyama, Hironori Arakawa* , Effective Enhancement of the Performance of Black Dye Based Dye-Sensitized Solar Cells by Metal Oxide Surface Modification of the TiO2 Photoelectrode
, Dalton Trans., 2012, 41, 5137-5139. , 10.1039/c2dt12275h, 2012.08.
29. Hironobu Ozawa, Ryosuke Shimizu, Hironori Arakawa* , Significant Improvement in the Conversion Efficiency of Black-Dye-Based Dye-Sensitized Solar Cells by Cosensitization with Organic Dye
, RSC Adv., 2012, 2, 3198-3200. , 10.1039/c2ra01257j, 2012.07.
30. Hironobu Ozawa, Hiroki Kawaguchi, Yu Okuyama, Hironori Arakawa*, Characterization of Photovoltaic Performance of the Dye-Sensitized Solar Cell with a Novel Ruthenium Complex Having a Bisdemethoxycurcumin as a Ligand
, Ambio, 2012, 41, 149-150., 10.1007/s13280-012-0278-1, 2012.06.
31. Hironobu Ozawa, Megumi Awa, Takahiko Ono, Hironori Arakawa* , Effects of Dye Adsorption Solvent on the Performances of the Dye-Sensitized Solar Cells Based on Black Dye
, Chem. Asian J., 2012, 7, 156-162. , 10.1002/asia.201100484, 2012.01.
32. Hironobu Ozawa, Hiroki Kawaguchi, Yu Okuyama, Hironori Arakawa* , Synthesis and Characterization of a Novel Ruthenium Complex Bearing a Curcumin Derivative Ligand and Its Application to Dye-Sensitized Solar Cells
, Chem. Lett., 2011, 40, 658-660. , 10.1246/cl.2011.658, 2011.11.
33. Hironobu Ozawa, Ken Sakai*, Photo-Hydrogen-Evolving Molecular Devices Driving Visible-Light-Induced Water Reduction into Molecular Hydrogen: Structure-Activity Relationship and Reaction Mechanism, Chem. Commun., 2011, 47, 2227-2242. (Feature Article), 10.1039/c0cc04708b, 2011.09.
34. Hironobu Ozawa, Takami Hino, Hideki Ohtsu, Tohru Wada, Koji Tanaka* , A New Type of Electrochemical Oxidation of Alcohols Mediated with a Ruthenium-Dioxolene-Ammine Complex in Neutral Water
, Inorg. Chim. Acta, 2011, 366, 298-302. , 10.1016/j.ica.2010.11.013, 2011.06.
35. Hironobu Ozawa, Masayuki Kobayashi, Bijitha Balan, Shigeyuki Masaoka, Ken Sakai* , Photo-Hydrogen-Evolving Molecular Catalysts Consisting of Polypyridyl Ruthenium(II) Photosensitizers and Platinum(II) Catalysts: Insights into the Reaction Mechanism
, Chem. Asian J., 2010, 5, 1860-1869. , 10.1002/asia.201000083, 2010.04.
36. Hironobu Ozawa, Ken Sakai* , An Effect of Structural Modification in the Photo-Hydrogen-Evolving Ru(II)Pt(II) Dimers
, Chem. Lett., 2007, 36, 920-921. , 10.1246/cl.2007.920, 2007.06.
37. Ken Sakai,* Hironobu Ozawa, Homogeneous Catalysis of Platinum(II) Complexes in Photochemical Hydrogen Production from Water
, Coord. Chem. Rev., 2007, 251, 2753-2766., 10.1016/j.ccr.2007.08.014, 2007.05.
38. Hironobu Ozawa, Yuki Yokoyama, Masa-aki Haga, Ken Sakai*, Syntheses, Characterization, and Photo-Hydrogen-Evolving Properties of Tris(2,2'-bipyridine)ruthenium(II) Derivatives Tethered to a cis-Pt(II)Cl2 Unit: Insights into the Structure-Activity Relationship
, Dalton Trans., 2007, 1197-1206., 10.1039/b617617h, 2007.01.
39. Hironobu Ozawa, Masa-aki Haga, Ken Sakai* , A Photo-Hydrogen-Evolving Molecular Device Driving Visible-Light-Induced EDTA-Reduction of Water into Molecular Hydrogen
, J. Am. Chem. Soc., 2006, 128, 4926-4927., 10.1021/ja058087h, 2006.06.
40. Ken Sakai,* Hironobu Ozawa, Hajime Yamada, Taro Tsubomura, Mariko Hara, Akon Higuchi, Masa-aki Haga, A Tris(2,2'-bipyridine)ruthenium(II) Derivative Tethered to a cis-PtCl2(amine)2 Moiety : Syntheses, Spectroscopic Properties, and Visible-Light-Induced Scission of DNA, Dalton Trans., 2006, 3300-3305., 10.1039/b600165c, Dalton Trans., 2006, 3300-3305., 2006.06.