Journal Paper

• Wang Guanyu, Lijie Zhang, Atsunori Ikezawa, Hajime Arai, Keiko Waki. Low-Temperature Active Site Formation for Oxygen Reduction Reaction in (Fe, N)-Doped Carbon Black via Rapid Thermal Annealing, Carbon Trends, Elsevier, Vol. 21, pp. 100556, Dec. 2025.  Official location  
• Jan Petit, Philipp Heugel, Julian Jakob Alexander Kreissl, Kohei Miyazaki, Takeshi Abe, Atsunori Ikezawa, Hajime Arai, Atsuko Yaguchi, Yoshihiro Nishimura, Yuya Akimoto, Franziska Klein, Jens Tübke, Jürgen Janek, Daniel Schröder. Comparison of 3D-Structured and Mesoporous Carbon as Host Material for Conversion/Alloy Active Material-Anodes with ZnO Using Operando Methods, ACS Applied Energy Materials, ACS Publications, Vol. 8, Issue 20, pp. 15196-15211, Oct. 2025.  Official location  
• Jiayuan Ni, Yuto Miyahara, Ryo Sakamoto, Changhee Lee, Kohei Miyazaki, Atsunori Ikezawa, Hajime Arai, Takeshi Abe. Influence of Perovskite Catalysts and Carbon Graphitization on Carbon Oxidation under Oxygen Evolution Reaction Conditions: A DEMS Study, Journal of The Electrochemical Society, Vol. 172, No. 9, pp. 094506, Sept. 2025.  Official location  
• Tetsuya Omiya, Atsunori Ikezawa, Keita Takahashi, Keiichi Saito, Masao Yonemura, Takashi Saito, Takashi Kamiyama, Kazuhiro Mori, Hajime Arai. Mitigation of resistance increase in positive electrodes of lithium-ion batteries during floating-cycling by operating voltage control, EES Batteries, Royal Society of Chemistry, Vol. 1, Issue 5, pp. 1323–1337, Aug. 2025.
• Arvind Pujari, Kumar Raju, Atsuko Yaguchi, Yoshihiro Nishimura, Yuya Akimoto, Atsunori Ikezawa, Hajime Arai, Michael De Volder. Operando Confocal Microscopy of Structured Battery Electrodes, Journal of The Electrochemical Society, Vol. 172, No. 7, pp. 070514, July 2025.
• Rui Liu, Atsunori Ikezawa, Moritz Borkenhagen, Takeyoshi Okajima, Daniel Schröder, Hajime Arai. Highly active LMO/Ni(Fe)-LDH bifunctional gas-diffusion electrode with bilayer design, Journal of Power Sources, Vol. 652, June 2025.  Official location  
• Kota Nakahara, Atsunori Ikezawa, Junichi Inamoto, Takeyoshi Okajima, Hajime Arai. How Do Pore Sizes Affect the Oxygen Reduction Reaction Kinetics of Platinum Electrodes?, Journal of Materials Chemistry A, Vol. 13, pp. 18338 - 18347, Apr. 2025.  Official location  
• Hiroshi Suyama, Shigeki Sato, Tomoya Matsunaga, Toshihiko Inoue, Atsunori Ikezawa, Hajime Arai. Application of Potassium Pyrophosphate Aqueous Electrolytes to Nickel Metal Hydride Batteries, ACS Applied Energy Materials, Vol. 8, No. 7, pp. 4257–4264, Mar. 2025.  Official location  
• Hajime Arai, Atsunori Ikezawa, Jean-Francois Drillet. Batteries – Battery Types – Zinc Batteries | Zinc–Air, Encyclopedia of Electrochemical Power Sources (Second Edition), Elsevier, Vol. 3, pp. 851-864, Jan. 2025.  Official location  
• J. Y. Huot, Atsunori Ikezawa, Hajime Arai. Chemistry and Electrochemistry | Zinc, Encyclopedia of Electrochemical Power Sources (Second Edition), Elsevier, Vol. 1, pp. 852-863, Jan. 2025.  Official location  
• Hajime Arai, Atsunori Ikezawa. Electrochemical Devices | Metal-Air Batteries, Encyclopedia of Electrochemical Power Sources (Second Edition), Elsevier, Vol. 1, pp. 292-300, Jan. 2025.  Official location  
• Hajime Arai, Atsunori Ikezawa. Lithium Batteries – Lithium Secondary Batteries – Li-ion Battery | Positive Electrode: Lithium Cobalt Oxide, Encyclopedia of Electrochemical Power Sources (Second Edition), Elsevier, Vol. 4, pp. 218-225, Jan. 2025.  Official location  

Book

• Atsunori Ikezawa, Hajime Arai. 水溶液系二次電池の研究開発 ～ 高エネルギー密度化と高耐久化 ～, 月刊 車載テクノロジー 2025年 3月号, 技術情報協会, Vol. 12, No. 6, pp. 69-75, Mar. 2025.

International Conference (Reviewed)

• Atsunori Ikezawa, Kotaro Yoshida, Takeyoshi Okajima, Hajime Arai. Electrochemical Investigation of Li+ Transfer at Solid|Solid Interface, Materials Research Meeting2025-MRM2025, Dec. 2025.
• Moritz Borkenhagen, Rui Liu, Atsunori Ikezawa, Hajime Arai, Daniel Schröder. Nonlinear frequency response analysis of bilayer gas–diffusion electrodes for zinc–oxygen batteries, Materials Research Meeting2025-MRM2025, Dec. 2025.
• Sota Inoue, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Operando Confocal Microscopy and Simulation Analysis of Ion Transport in Graphite Electrode toward Reduced Resistance in All-Solid-State Batteries, IBA2025 (The International Battery Materials Association Annual Meeting 2025), Nov. 2025.
• Ryo Ishikawa, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Short-Term Diagnosis of LIBs Degraded by Float Charging with Periodic Discharging, IBA2025 (The International Battery Materials Association Annual Meeting 2025), Nov. 2025.
• Tenshin Kobayashi, Takeyoshi Okajima, Atsunori Ikezawa, Hajime Arai. Oxygen Evolution Reaction Activity of NiFe-LDH with High Crystallinity and Specific Surface Area, IBA2025 (The International Battery Materials Association Annual Meeting 2025), Nov. 2025.
• Takeru Kuroda, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Synthesis and Evaluation of Hydrous Nickel Oxyhydroxide Electrodes by Soft Chemical Method, IBA2025 (The International Battery Materials Association Annual Meeting 2025), Nov. 2025.
• Zhang Huijie, Takeyoshi Okajima, Atsunori Ikezawa, Hajime Arai. Enhancing Proton Battery Efficiency Through Electrode and Electrolyte Optimization, IBA2025 (The International Battery Materials Association Annual Meeting 2025), Nov. 2025.
• Ryohei Kosasa, Atsunori Ikezawa, Hiroshi Suyama, Tomoya Matsunaga, Toshihiko Inoue, Takeyoshi Okajima, Hajime Arai. Elucidation of Charge and Discharge Mechanism of Modified Layered Hydrated Manganese Dioxide Positive Electrode Using Operando Measurements, 248th ECS Meeting, Oct. 2025.
• Yusuke Suzuki, Haruki Kaneda, Yuki Furuichi, Hiromasa Toya, Takeyoshi Okajima, Atsunori Ikezawa, Hajime Arai. A Comparative Investigation of Single- and Poly-Crystalline Positive Electrode Particles in All-Solid-State Batteries Using Three-Electrode Cells, 248th ECS Meeting, Oct. 2025.
• Hajime Arai, Atsunori Ikezawa. Rechargeability of ZnO Composite Electrodes in Hydrophilic-Polymer Added KOH Electrolytes, 248th ECS Meeting, Oct. 2025.
• Liu Rui, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Bifunctional LMO/Ni(Fe)-LDH gas-diffusion electrode with bilayer design for rechargeable zinc–air battery, 4th International Zinc and other Aqueous Batteries Workshop, Sept. 2025.
• Kotaro Yoshida, Takeyoshi Okajima, Hajime Arai, Atsunori Ikezawa, Janis. K. Eckhardt, Sascha Kremer, Felix Schug, René Rekers Leonardo Merola, Jürgen Janek. Investigation of the Current Constriction Effect at the Interfaces between Sulfide Solid Electrolytes, 76th Annual Meeting of the International Society of Electrochemistry, Sept. 2025.
• Hiroshi Suyama, Shigeki Sato, Tomoya Matsunaga, Toshihiko Inoue, Atsunori Ikezawa, Hajime Arai. Batteries Using Anti-Freezing Highly Concentrated K4P2O7 Aqueous Electrolytes, 4th International Zinc and other Aqueous Batteries Workshop, Sept. 2025.
• Atsunori Ikezawa, Shinji Koito, Kota Nakahara, Junichi Inamoto, Takeyoshi Okajima, Hajime Arai. Development of Oxygen Electrocatalysts for Zinc-Air Secondary Batteries Using Model Electrodes, 4th International Zinc and other Aqueous Batteries Workshop, Sept. 2025.
• Nanako Nonaka, Atsunori Ikezawa, Takeyoshi Okajima, Hajime Arai. Local potential Indicators for Bifunctional Air Electrodes, 4th International Zinc and other Aqueous Batteries Workshop, Sept. 2025.
• Ryohei Kosasa, Atsunori Ikezawa, Hiroshi Suyama, Tomoya Matsunaga, Toshihiko Inoue, Takeyoshi Okajima, Hajime Arai. Analysis of charge-discharge mechanism of layered hydrated manganese dioxide positive electrode in alkaline electrolyte, 4th International Zinc and other Aqueous Batteries Workshop, Sept. 2025.
• Moritz Borkenhagen, Rui Liu, Atsunori Ikezawa, Hajime Arai, Daniel Schröder. Exploring Interfacial Behavior: A non-linear Impedance Approach to Gas Diffusion Electrodes in Zinc-Oxygen Batteries, 4th International Zinc and other Aqueous Batteries Workshop, Sept. 2025.
• Atsunori Ikezawa, Shinji Koito, Hajime Arai. Oxygen Evolution Reaction Activities of Highly Crystalline NiFe-LDHs Synthesized Using Soft Chemistry, 76th Annual Meeting of the International Society of Electrochemistry, Sept. 2025.
• Dogen Cho, Masanori Yamamoto, Hajime Arai, Ichiro Yamanaka. Synthesis of Formic Acid by the SPE Electrolysis of CO2 and water, 20th Japan-Korea Symposium on Catalysis, May 2025.

Domestic Conference (Reviewed)

• Yusuke Suzuki, Haruki Kaneda, Yuki Furuichi, TAKEYOSHI OKAJIMA, Atsunori Ikezawa, Hajime Arai. 全固体三極式セルを用いた単結晶・多結晶状正極活物質粒子の電気化学特性, 第66回電池討論会, Nov. 2025.
• Takashi Hirose, Naoki Matsui, Takashi Ito, 日沼洋陽, 池田一貴, 後藤和馬, Guangzhong Jiang, Kouta Suzuki, Masaaki Hirayama, Hajime Arai, Ryoji KANNO. 逆α-AgI型ヒドリドイオン導電体の合成，構造解析，イオン導電機構解明, 第51回固体イオニクス討論会, Nov. 2025.
• Masataka Mashino, Atsunori Ikezawa, Takeshi Shimomura, Hajime Arai. 設計の異なるリチウムイオン電池を用いた定負荷サイクル試験による劣化メカニズム解析, 第66回電池討論会, Nov. 2025.
• Ryohei Kosasa, Atsunori Ikezawa, Hiroshi Suyama, Tomoya Matsunaga, Toshihiko Inoue, TAKEYOSHI OKAJIMA, Hajime Arai. アルカリ二次電池用充電開始型マンガン電極の開発, 第66回電池討論会, Nov. 2025.
• Arvind Pujari, Kumar Raju, Junko Yaguchi, Yoshihiro Nishimura, Yuya Akimoto, Atsunori Ikezawa, Hajime Arai, Michael De Volder. コンフォーカル光学系を用いた構造化電極のOperando観察 ～LFP反応分布の解析とその抑制～, 第66回電池討論会, Nov. 2025.
• 堀江 航, 池澤 篤憲, 岡島 武義, 荒井 創. その場観察を用いた金属亜鉛合剤電極の劣化挙動解析, 第15回 CSJ化学フェスタ2025, Oct. 2025.
• Ryohei Kosasa, Atsunori Ikezawa, Hiroshi Suyama, Tomoya Matsunaga, Toshihiko Inoue, TAKEYOSHI OKAJIMA, Hajime Arai. アルカリマンガン電池正極の充放電メカニズム評価, 第43回 夏の学校 電気化学会関東支部, Sept. 2025.
• 平田 海斗, 青木 創汰, Atsunori Ikezawa, Hajime Arai, 高橋 康史. 走査型イオンコンダクタンス顕微鏡によるZn二次電池に向けた負極実材料のオペランド解析, 2025電気化学会秋季大会, Sept. 2025.
• TAKEYOSHI OKAJIMA, Atsunori Ikezawa, Hiroshi Ito, Naoya Ishida, Jun Shiroma, Koji Kawamoto, Hajime Arai. 硫化物系全固体電池における電極材料評価用対極の開発, 2025電気化学会秋季大会, Sept. 2025.
• Dogen Cho, Masanori Yamamoto, Hajime Arai, ICHIRO YAMANAKA. In-N系電極触媒を用いた二酸化炭素と水のSPE共電解による直接ギ酸合成, Catalysis society of Japan, Sept. 2025.
• Atsunori Ikezawa, Goro Fukunishi, Hajime Arai, Atsuko Yaguchi, Yoshihiro Nishimura, Yuya Akimoto. Analysis of Local State of Charge in Sulfide All-Solid State Graphite Electrode, 第19回 固体イオニクスセミナー, Aug. 2025.
• Kotaro Yoshida, Takeyoshi Okajima, Hajime Arai, Atsunori Ikezawa, Janis. K. Eckhardt, Sascha Kremer, Felix Schug, René Rekers Leonardo Merola, Jürgen Janek. Investigation of the Current Constriction Effect at the Interfaces between Sulfide Solid Electrolytes, 第19回 固体イオニクスセミナー, Aug. 2025.
• Nanako Nonaka, Atsunori Ikezawa, TAKEYOSHI OKAJIMA, Hajime Arai. Cu, Ag, Niを電位指示物質に用いた二機能性空気極内局所状態の光学観察, 電気化学会第92回大会, Mar. 2025.
• Ryohei Kosasa, Atsunori Ikezawa, Hiroshi Suyama, Tomoya Matsunaga, Toshihiko Inoue, TAKEYOSHI OKAJIMA, Hajime Arai. Operando Mn–およびBi–XAFSによる水和二酸化マンガン正極の充放電メカニズム解析, 電気化学会第92回大会, Mar. 2025.

Patent

• Hajime Arai, Atsunori Ikezawa. 正極活物質及び水系電池. Patent. Published. 国立大学法人東京科学大学, トヨタ自動車株式会社. 2024/09/18. 特願2024-161106. 2025/04/15. 特開2025-063002. 2025.

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