Kyushu University Academic Staff Educational and Research Activities Database
List of Papers
Hironobu Ozawa Last modified date:2019.06.05

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


Papers
1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
6. 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.
7. 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.
8. 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.
9. 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.
10. 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.
11. 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.
12. 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.
13. 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.
14. 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.
15. 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.
16. 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.
17. 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.
18. 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.
19. 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.
20. 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.
21. 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.
22. 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.
23. 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.
24. 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.
25. 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.
26. 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.
27. 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.
28. 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.
29. 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.
30. 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.
31. 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.
32. 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.
33. 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.
34. 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.
35. 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.
36. 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.