Megumi Okazaki Profile

■ 連絡先

岡崎めぐみ（おかざきめぐみ）
助教, 博士（理学）

東京科学大学理学院（主担当: 化学系エネルギー・情報コース）
〒152-8550
東京都目黒区大岡山2-12-1-NE-2 EEI棟703号室
Tel. 03-5734-2759, Fax. 03-5734-2759
E-mail: okazaki (at) chem.sci.isct.ac.jp

■ 学歴

2007年4月-2013年3月......東京都立小石川中等教育学校
2013年4月-2017年3月......東京工業大学理学部化学科
2017年4月-2019年3月......東京工業大学理学院化学系修士課程
2019年4月-2022年3月......東京工業大学理学院化学系博士後期課程

■ 職歴

2019年4月-2022年3月......日本学術振興会特別研究員（DC1）
2022年4月-2023年3月......産業技術総合研究所ゼロエミッション国際共同研究センター人工光合成チーム博士研究員
2023年4月-2024年1月......東京工業大学理学院化学系特任助教
2024年2月-......現職

■ 受賞歴等

2018年8月...新学術領域研究「複合アニオン化合物の創製と新機能」第4回若手スクール優秀ポスター賞
2019年9月...2019年光化学討論会優秀学生発表賞 Journal of Photochemistry and Photobiology C賞
2021年3月...第127回触媒討論会注目発表選出
2023年3月...東京工業大学手島精一記念研究賞博士論文賞

■ 学会委員歴等

2019年-現在...触媒学会若手会委員
2026年4月-現在...SSH運営指導委員

■ 原著論文

33.	Megumi Okazaki, Kenta Ikegami, Seira Mori, Zi Lang Goo, Naoki Tarutani, Takeshi Watanabe, Shunsuke Nozawa, Yuta Tsuji, Kunihisa Sugimoto, Kiyofumi Katagiri, Kazuhiko Maeda “Crystal-Structure-Dependent Water Adsorption Governs Water Oxidation Activity of FeOOH Polymorphs: Insights from Electrochemical and Bias-Free Photochemical Systems” submitted.
32.	Yu Takagi, Masaya Yara, Toshiya Tanaka, Jo Onodera, Minato Tanaka, Megumi Okazaki, Kiyoshi Miyata, Ken Onda, Osamu Ishitani, Kazuhiko Maeda “Introducing an insulating alumina layer into a molecular photocathode to improve CO2 reduction activity” *Chem. Commun.* 2026, in press. DOI: 10.1039/D6CC00558F.
31.	Yusuke Nambu, Akihide Kuwabara, Masahiro Kawamata, Seira Mori, Megumi Okazaki, Kazuhiko Maeda “Refining Hydrogen Positions in α-FeOOH through Combined Neutron Diffraction and Computational Techniques” *Dalton Trans.* 2026, in press. DOI: 10.1039/D5DT00217F.
30.	Ryuichi Nakada, Rikuya Nagao, Jo Onodera, Xian Zhang, Masahito Oura, Megumi Okazaki, Toshiya Tanaka, Riku Koda, Minato Tanaka, Ken Onda, Kazuhiko Maeda “Elucidating the Origin of Hidden Limitations in Ru-Complex/Ag/Polymeric Carbon Nitride Hybrid Photocatalysts for Visible-Light CO2 Reduction” *J. Am. Chem. Soc.* 2026, 148 (10), 10924–10933. Open Access! Supplementary Cover!
29.	Gentoku Kido, Hiroto Ueki, Megumi Okazaki, Jun Kikkawa, Koji Kimoto, Ryosuke Nishikubo, Akinori Saeki, Kazuhiko Maeda “Lewis Acid–Base Driven Anisotropic Crystal Growth of Pyrochlore Pb2Ti2O5.4F1.2 with Enhanced Visible-Light H2 Evolution Activity” *Chem. Mater.* 2026, 38 (4), 1980–1990. Open Access!
28.	Chomponoot Suppaso, Yura Jang, Saori Ogura, Ryohei Akiyoshi, Ryuichi Nakada, Megumi Okazaki, Fumitaka Ishiwari, Kazuyoshi Ogasawara, Akinori Saeki, Daisuke Tanaka, Kazuhiko Maeda “A Lead(II)-based Coordination Polymer Exhibiting Photocatalytic and Electrochemical CO2 Reduction Activities” *Inorg. Chem.* 2026, 65 (7), 3957–3966. Open Access!
27.	Jo Onodera, Xian Zhang, Toshiya Tanaka, Ryuichi Nakada, Megumi Okazaki, Naoki Tarutani, Kiyofumi Katagiri, Kazuhiko Maeda “Protective Reaction Fields Created by Deep Eutectic Solvents against Molecular Oxygen in CO2 Reduction over Ru(II)-Complex/Ag/Polymeric Carbon Nitride Hybrid Photocatalysts” *ACS Catal.* 2026, 16 (4), 3368–3379. Open Access!
26.	Shunta Iwamoto, Ryohei Akiyoshi, Sora Nakasone, Chomponoot Suppaso, Megumi Okazaki, Kazuhide Kamiya, Yuta Tsuji, Daisuke Tanaka, Kazuhiko Maeda “Substituent-Position-Dependent Electrochemical CO2 Reduction Activity of Pb–S-based Coordination Polymers” *Chem. Mater.* 2026, 38 (3), 1496–1504. Open Access! Supplementary Cover!
25.	Megumi Okazaki, Zi Lang Goo, Haruka Yamamoto, Kenta Ikegami, Issei Yamamoto, Naoki Tarutani, Fumitaka Takeiri, Takeshi Watanabe, Shunsuke Nozawa, Kiyofumi Katagiri, Kunihisa Sugimoto, Kazuhiko Maeda “In Situ X-ray Absorption Fine Structure Spectroscopy Measurement of Suspended Cobalt Oxide Nanoparticle Water Oxidation Catalyst” *J. Phys. Chem. Lett.* 2026, 17 (3), 825–832. Open Access! Supplementary Cover!
24.	Shuwei Liu, Ryosuke Nishikubo, Fumitaka Ishiwari, Xian Zhang, Megumi Okazaki, Shunsuke Nozawa, Akinori Saeki, Kazuhiko Maeda “Topochemical synthesis of mesoporous TiO2 co-doped with nitrogen and fluorine for improved photocatalytic O2 evolution under visible light” *Nanoscale Horiz.* 2026, 11 (2), 498-507.
23.	Hideya Tsuchikado, Yuki Kinoshita, Masashi Hattori, Megumi Okazaki, Takuto Soma, Fumitaka Ishiwari, Michikazu Hara, Koji Kimoto, Akinori Saeki, Kazuhiko Maeda “Topochemical Synthesis and Photocatalytic Activity of Layered K2LaTa2O6N Using CsLaTa2O7 Precursor Prepared by Flux Method” *Inorg. Chem.* 2025, 64 (49), 24256-24263.
22.	Haruka Yamamoto, Toshiya Tanaka, Masahito Oura, Kelly M. Kopera, Megumi Okazaki, Ken Onda, Thomas E. Mallouk, Kazuhiko Maeda “Charge Transfer Dynamics in Dye-Sensitized Photocatalysts Using Metal Complex Sensitizers with Long-Wavelength Visible Light Absorption Based on Singlet–Triplet Excitation” *ACS Catal.* 2025, 15 (24), 20889–20898. Open Access! Supplementary Cover!
21.	Masaya Shimabukuro, Risa Miyake, Megumi Okazaki, Ryo Kishida, Zhibin Wang, Taiyo Yukawa, Kazuhiko Maeda, Eriko Marukawa, Masakazu Kawashita “Compositionally Optimized Bone Scaffolds Based on Carbonate Apatite and Silver Phosphate for Osteogenesis, Scaffold Resorption, and Photoactivated Antibacterial Activity” *ACS Appl. Bio Mater.* 2025, 8 (11), 10158–10170. Open Access!
20.	Kakeru Harada, Haruka Yamamoto, Megumi Okazaki, Thomas E. Mallouk, Kazuhiko Maeda “Visible-light H2 evolution using dye-sensitized TiO2: Effects of physicochemical property of TiO2 on excited carrier dynamics and activity” *J. Mater. Chem. A* 2025, 13 (43), 36997-37007. Open Access!
19.	Megumi Okazaki, Yura Jang, Daehyeon An, Nipaporn Pongkan, Yusuke Asai, Ryosuke Nakazato, Shunta Nishioka, Yoshinobu Kamakura, Miwa Saito, Nithima Khaorapapong, Teruki Motohashi, Shunsuke Nozawa, Toshiyuki Yokoi, Kazuhiko Maeda “Zinc-based mixed-anion catalysts for photochemical reduction of carbon dioxide” *Dalton Trans.* 2025, 54 (32), 12301-12307. 複合アニオン特集号
18.	Hiroto Ueki, Toshiya Tanaka, Shuji Anabuki, Ryuichi Nakada, Megumi Okazaki, Kenta Aihara, Masashi Hattori, Fumitaka Ishiwari, Rie Haruki, Shunsuke Nozawa, Toshiyuki Yokoi, Michikazu Hara, Osamu Ishitani, Akinori Saeki, Akira Yamakata, Kazuhiko Maeda “Mesoporous Oxyhalide Aggregates Exhibiting Improved Photocatalytic Activity for Visible-Light H2 Evolution and CO2 Reduction” *ACS Catal.* 2025, 15 (14), 12551–12562. Open Access!
17.	Hideya Tsuchikado, Shuji Anabuki, Ovidiu Cretu, Yuki Kinoshita, Masashi Hattori, Yuta Shiroma, Dongxiao Fan, Megumi Okazaki, Takuto Soma, Fumitaka Ishiwari, Shunsuke Nozawa, Michikazu Hara, Koji Kimoto, Akira Yamakata, Akinori Saeki, Kazuhiko Maeda “Effects of metal-cation doping on photocatalytic H2 evolution activity of layered perovskite oxynitride K2LaTa2O6N ” *ACS Appl. Energy Mater.* 2025, 8 (6), 3541-3552. Open Access!
16.	Ryuichi Nakada, Chao Zhang, Jo Onodera, Toshiya Tanaka, Megumi Okazaki, Guigang Zhang, Kazuhiko Maeda “Light-intensity dependence of visible-light CO2 reduction over Ru(II)-complex/Ag/polymeric carbon nitride hybrid photocatalysts” *Sustainable Energy Fuels* 2025, 9 (4), 947-952. Open Access! Front Cover!
15.	Megumi Okazaki, Yasuomi Yamazaki, Daling Lu, Shunsuke Nozawa, Osamu Ishitani, Kazuhiko Maeda “Discovery of the threshold potential that triggers photochemical water oxidation with Ru(II) photosensitizers and MOx catalysts” *Chem Catal.* 2025, 5 (1), 101167. Open Access!
14.	Toshiya Tanaka, Chao Zhang, Ryuichi Nakada, Jo Onodera, Fumitaka Ishiwari, Megumi Okazaki, Akinori Saeki, Osamu Ishitani, Guigang Zhang, Kazuhiko Maeda “Significant effect of crystallization of polymeric carbon nitride on photoconductivity and photocatalytic activity for visible-light CO2 reduction” *CCS Chem.* 2024, 6 (12), 2940-2949. Open Access!
13.	Haruka Yamamoto, Langqiu Xiao, Yugo Miseki, Hiroto Ueki, Megumi Okazaki, Kazuhiro Sayama, Thomas E. Mallouk, Kazuhiko Maeda “Is platinum-loaded titania the best material for dye-sensitized hydrogen evolution under visible light?” *Chin. J. Catal.* 2024, 63 (8), 124-132. Special Issue on Catalysis for Solar Fuel Production, with dedication to Prof. Kazunari Domen on the occasion of his 70th birthday.
12.	Yoshitaka Tamura, Megumi Okazaki, Hiroto Ueki, Kenta Aihara, Tomoki Kanazawa, Dongxiao Fan, Rie Haruki, Akihide Iwase, Shunsuke Nozawa, Fumitaka Ishiwari, Kunihisa Sugimoto, Akinori Saeki, Kazuhiko Maeda “Modification of Visible-Light-Responsive Pb2Ti2O5.4F1.2 with Metal Oxide Cocatalysts to Improve Photocatalytic O2 Evolution toward Z-scheme Overall Water Splitting” ChemSusChem 2024, 17 (12), e202400408. VIP. Open Access! Front cover!
11.	Akinobu Miyoshi, Megumi Okazaki, Kosaku Kato, Tomoki Kanazawa, Toshiyuki Yokoi, Shunta Nishioka, Shunsuke Nozawa, Akira Yamakata, Kazuhiko Maeda “Photocatalytic Hydrogen Evolution Activity of Nitrogen/Fluorine-Codoped Rutile TiO2” ACS Omega 2023, 8 (44), 41809-41815.
10.	Kenta Aihara, Ryusuke Mizuochi, Megumi Okazaki, Shunta Nishioka, Shuhei Yasuda, Toshiyuki Yokoi, Fumitaka Ishiwari, Akinori Saeki, Miki Inada, Kazuhiko Maeda “Low-Temperature Microwave-Assisted Hydrothermal Synthesis of Pb2Ti2O5.4F1.2 Photocatalyst for Improved H2 Evolution under Visible Light” ACS Materials Lett. 2023, 5 (9), 2355-2360. Open Access! Front Cover!
9.	Hiroto Mogi, Megumi Okazaki, Shunta Nishioka, Kazuhiko Maeda “In situ formation of a molecular cobalt(III)/AgCl photocatalyst for visible-light water oxidation” Sustainable Energy Fuels 2021, 5, 5694–5698.
8.	Kazuhiko Maeda, Haruki Wakayama, Yasuhito Washio, Asako Ishikawa, Megumi Okazaki, Hiroko Nakata, Satoru Matsuishi “Visible-Light-Induced Photocatalytic Activity of Stacked MXene Sheets of Y₂CF₂” J. Phys. Chem. C 2020, 124 (27), 14640–14645.
7.	Megumi Okazaki, Yoshiki Suganami, Naoki Hirayama, Hiroko Nakata, Tomoya Oshikiri, Toshiyuki Yokoi, Hiroaki Misawa, Kazuhiko Maeda “Site-Selective Deposition of a Cobalt Cocatalyst onto a Plasmonic Au/TiO₂ Photoanode for Improved Water Oxidation” ACS Appl. Energy Mater. 2020, 3 (6), 5142-5146.
6.	Hideyuki Tanaka, Tomoki Uchiyama, Nozomi Kawakami, Megumi Okazaki, Yoshiharu Uchimoto, Kazuhiko Maeda “Water Oxidation through Interfacial Electron Transfer by Visible Light Using Cobalt-Modified Rutile Titania Thin-Film Photoanode” ACS Appl. Mater. Interfaces 2020, 12 (8), 9219–9225.
5.	Shunta Nishioka, Yasuomi Yamazaki, Megumi Okazaki,Keita Sekizawa, Go Sahara, Riho Murakoshi, Daiki Saito, Ryo Kuriki, Takayoshi Oshima, Junji Hyodo, Yoshihiro Yamazaki, Osamu Ishitani, Thomas E. Mallouk, Kazuhiko Maeda “Defect Density-Dependent Electron Injection from Excited-State Ru(II) Tris-Diimine Complexes into Defect-Controlled Oxide Semiconductors” J. Phys. Chem. C 2019, 123 (46), 28310–28318.
4.	Megumi Okazaki, Yunan Wang, Toshiyuki Yokoi, Kazuhiko Maeda “Visible-Light-Driven Water Oxidation Using Anatase Titania Modified with First-Row Transition-MetalOxide Nanoclusters” *J. Phys. Chem. C* 2019, 123 (16), 10429–10434.
3.	Koki Ishimaki, Tomoki Uchiyama, Megumi Okazaki, Daling Lu, Yoshiharu Uchimoto, Kazuhiko Maeda “Influence of TiO₂ Support on Activity of Co₃O₄/TiO₂ Photocatalysts for Visible-Light Water Oxidation” *Bull. Chem. Soc. Jpn.* 2018, 91 (3), 486–491.
2.	Megumi Okazaki, Miharu Eguchi, Tomoki Uchiyama, Daling Lu, Hideki Kato, Yoshiharu Uchimoto, Masato Kakihana, Kazuhiko Maeda “Effects of SrTiO₃ support on visible-light water oxidation with Co₃O₄ nanoparticles” Dalton Trans. 2017, 46 16959–16966.
1.	Kazuhiko Maeda, Koki Ishimaki, Megumi Okazaki, Tomoki Kanazawa, Daling Lu, Shunsuke Nozawa,Hideki Kato, Masato Kakihana “Cobalt Oxide Nanoclusters on Rutile Titania as Bifunctional Units for Water Oxidation Catalysis and Visible-Light-Absorption: Understanding the Structure–Activity Relationship” ACS Appl. Mater. Interfaces 2017, 9 (7), 6114–6122.

■ 総説等

4.	Megumi Okazaki, Yuta Tsuji, Daisuke Tanaka, Hiroshi Kageyama, Kazuhiko Maeda “Anion-Controlled Inorganic Materials as Catalysts for Small-Molecule Conversion Reactions” *ACS Appl. Mater. Interfaces* 2025, 17 (17), 24665-24674. Open Access!
3.	Akinobu Miyoshi, Megumi Okazaki, Kazuhiko Maeda "Chapter 2: Rutile TiO₂-based New Photocatalysts for Visible-light Water Oxidation" Academic Press Elsevier, Current Developments in Photocatalysis and Photocatalytic Materials -New Horizon in Photocatalysis-, *2019*, 7–22.
2.	岡崎めぐみ・前田和彦 "新しい原理で駆動する可視光水分解電極の開発～ありふれた物質を用いた新機能創発～" クリーンエネルギー, 2020, 23-29
1.	岡崎めぐみ・前田和彦 "担持コバルト種を酸素生成活性点および光吸収中心とした広域可視光応答型光触媒の開発" 化学工業, 2017, 557-561

■ 招待講演

6.	“pH buffer dependence of suspended NiOx nanoparticle catalyst active for water oxidation in a solution” IPS-25 (2026年7月12-17日予定, Seoul).
5.	“「反応ポテンシャル」が論文になるまで” 第47回光化学若手の会 (2026年6月19-20日予定, 東京).
4.	“担持ナノ粒子粉末触媒の水の酸化反応に対する擬過電圧の見積もり” 第40回ライラックセミナー (2026年5月30-31日予定, 札幌).
3.	““Reaction potential” in metal oxide nanoparticles for water oxidation measured by condition-controlled photochemical reactions” Pacifichem2025 (2025年12月17日, Honolulu).
2.	“担持ナノ粒子触媒による光化学的な水の酸化反応とCO₂変換反応” 第136回触媒討論会（依頼講演） (2025年9月19日, 東北大学).
1.	"A trigger potential proceeding water oxidation over metal oxide catalysts with Ru(II) photosensitizer complexes" IPS-24/ICARP2024 (2024年7月31日, International Conference Center Hiroshima).