Faculty Profiles - NAITO Takahiro

写真a

NAITO Takahiro

Organization

Graduate School of Engineering Chemical Systems Engineering 1 Designated Assistant Professor

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Degree 1

Doctor (Engineering) （ 2022.4 The University of Tokyo ）

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Research Interests 2

Catalysis
Catalysis

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Research Areas 1

Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Catalytic processes and resource chemistry

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Awards 1

文部科学省マテリアル先端リサーチインフラ令和７年度秀でた利用成果優秀賞

2026.1 ARIM Japan 窒素分子の水素化反応のためのBa/Co/Carbon触媒の高分解電子顕微鏡解析

佐藤勝俊、内藤剛大、永岡勝俊、Kanishka De Silva、鳥山誉亮、山本知一、麻生亮太郎、村上恭和

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Country：Japan

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Papers 16

Design of Alkaline Earth-Doped Co/MgO Catalysts for Ammonia Decomposition Open Access

Hayashi, S; Takeuchi, Y; Naito, T; De Silva, KKH; Sato, K; Toriyama, T; Yamamoto, T; Murakami, Y; Nagaoka, K

CHEMSUSCHEM Vol. 19 ( 4 ) page： e202501801 2026.2

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Language：English Publisher：Chemsuschem

Hydrogen is expected to be used as a fuel additive to ammonia, a non-flammable and carbon-free fuel, to improve combustion efficiency. However, the design strategies for developing highly active, nonprecious metal catalysts for ammonia decomposition are not yet well understood. Here, we show that Co/Ba<inf>0.01</inf>Mg<inf>0.99</inf>O exhibits high activity, with an ammonia conversion of 94.4% and a hydrogen production rate of 3.79 mol g<inf>cat</inf>−1 h−1 at 500°C with a WHSV of 60,000 mL g<inf>cat</inf>−1 h−1. Comparison of the dopant effects of alkaline earth metal elements elucidates that the high activity of Co/Ba<inf>0.01</inf>Mg<inf>0.99</inf>O is ascribed to the formation of a specific Co-BaO core–shell-like structure, with highly basic BaO nanoparticles covering the Co particles. The core–shell-like structures were not formed with other alkaline earth elements. Such features facilitate efficient electron donation to Co nanoparticles, promoting N<inf>2</inf> formation. Furthermore, kinetic analysis indicated that doping of alkaline earth metals weakens the adsorption of strongly bound species. Our findings will contribute to the development of cost-effective supported metal catalysts for hydrogen production through ammonia decomposition, leading to the realization of a carbon-neutral society in which ammonia plays a key role.

DOI： 10.1002/cssc.202501801

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Effect of Potassium Doping on the Surface Structure and Ammonia Synthesis Activity of Co/MgO Open Access

Tomoko Shibata, Kohei Era, Katsutoshi Sato, Shin-ichiro Miyahara, Takahiro Naito, K. Kanishka H. De Silva, Hiroshi Yamada, Takaaki Toriyama, Takehiro Tamaoka, Tomokazu Yamamoto, Yasukazu Murakami, Koji Inazu, Katsutoshi Nagaoka

ACS Omega Vol. 10 ( 44 ) page： 53113 - 53121 2025.11

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/acsomega.5c07671

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Comprehensive kinetic analysis of ammonia synthesis over a Co/BaO/MgO catalyst under milder conditions: Integral reactor modeling via Langmuir–Hinshelwood mechanism Open Access

Mostafa El-Shafie, Tomoyuki Yajima, Takahiro Naito, Katsutoshi Sato, Shoichi Tsuda, Koji Inazu, Katsutoshi Nagaoka, Yoshiaki Kawajiri

Chemical Engineering Journal Vol. 523 page： 168922 - 168922 2025.11

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Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.cej.2025.168922

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Efficient metallic Ni as a bifunctional electrocatalyst for integrating continuous PET plastic upcycling with hydrogen production

Xin Li, Jiyi Sun, Huijing Ma, Xia Long, Tianqi Li, Yuto Shimoyama, Takahiro Naito, Katsutoshi Sato, Hiroshi Yamada, Katsutoshi Nagaoka, Yixin Zhao, Xufang Qian

Applied Catalysis B: Environment and Energy Vol. 371 page： 125211 - 125211 2025.8

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Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

DOI： 10.1016/j.apcatb.2025.125211

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Realization of Ideal Ba Promoter State by Simultaneous Incorporation with Co into Carbon-protective Framework for Ammonia Synthesis Catalyst

De Silva, KKH; Sato, K; Naito, T; Toriyama, T; Yamamoto, T; Aso, R; Murakami, Y; Varadwaj, PR; Asahi, R; Inazu, K; Nagaoka, K

ADVANCED ENERGY MATERIALS Vol. 15 ( 8 ) 2025.2

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Publisher：Advanced Energy Materials

Developing non-noble metal catalysts with excellent NH<inf>3</inf> synthesis activity under mild conditions is a long-term goal. The best catalysts reported to date often require laborious fabrication methods and controlled environments to fabricate the catalysts or high temperatures and long times to activate the catalysts. This work introduces a facile one-pot method to fabricate carbon (C)-based, barium (Ba)-promoted cobalt (Co) catalysts via the citric acid sol–gel method with metal nitrates as precursors and water as the solvent. This approach ensures the homogeneous incorporation of metal ions into the carbon framework. The resulting (Ba/Co)<inf>0.3</inf>/C catalyst demonstrates an outstanding NH<inf>3</inf> synthesis activity of 34 mmol g<inf>cat</inf>−1 h−1 (350 °C, 1.0 MPa) with excellent stability. In-depth characterizations reveal that Ba exists as barium oxide (BaO), uniformly distributed on the carbon framework and around the Co nanoparticles. It is uncovered that retarding barium carbonate (BaCO<inf>3</inf>) formation in the fresh catalyst significantly reduces the reduction temperature and time (485 °C/4 h), which is a fundamental advantage of this method. Density functional theory and molecular dynamics simulations indeed support the experimental observations. It is anticipated that this simple and economical strategy will resolve the issues in a broad field of heterogeneous catalyst research.

DOI： 10.1002/aenm.202404030

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Barium-doped Iron Nanoparticles supported on MgO as an Efficient Catalyst for Ammonia Synthesis under Mild Reaction Conditions

Kohei Era, Katsutoshi Sato, Shin-ichiro Miyahara, Takahiro Naito, Kanishka De Silva, Saeid Akrami, Hiroshi Yamada, Takaaki Toriyama, Takehiro Tamaoka, Tomokazu Yamamoto, Yasukazu Murakami, Koji Inazu, Katsutoshi Nagaoka

Sustainable Energy & Fuels Vol. 8 ( 12 ) page： 2593 - 2600 2024.6

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Publishing type：Research paper (scientific journal) Publisher：Royal Society of Chemistry (RSC)

To realize a carbon-neutral society, developing highly active and inexpensive catalysts for ammonia (NH3) production working at moderate conditions (<400 °C, <10 MPa) using hydrogen fabricated from the electrolysis of...

DOI： 10.1039/d4se00411f

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Catalytic Behavior of K‐doped Fe/MgO Catalysts for Ammonia Synthesis Under Mild Reaction Conditions Reviewed Open Access

Kohei Era, Katsutoshi Sato, Shin‐ichiro Miyahara, Takahiro Naito, Kanishka De Silva, Saeid Akrami, Hiroshi Yamada, Takaaki Toriyama, Tomokazu Yamamoto, Yasukazu Murakami, Ken‐ichi Aika, Koji Inazu, Katsutoshi Nagaoka

ChemSusChem Vol. 16 ( 22 ) page： e202300942 2023.11

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Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

Abstract

An important part of realizing a carbon‐neutral society using ammonia will be the development of an inexpensive yet efficient catalyst for ammonia synthesis under mild reaction conditions (<400 °C, <10 MPa). Here, we report Fe/K(3)/MgO, fabricated via an impregnation method, as a highly active catalyst for ammonia synthesis under mild reaction conditions (350 °C, 1.0 MPa). At the mentioned conditions, the activity of Fe/K(3)/MgO (17.5 mmol h−1 gcat−1) was greater than that of a commercial fused iron catalyst (8.6 mmol h−1 gcat−1) currently used in the Haber‐Bosch process. K doping was found to increase the ratio of Fe0 on the surface and turnover frequency of Fe in our Fe/K(3)/MgO catalyst. In addition, increasing the pressure to 3.0 MPa at the same temperature led to a significant improvement of the ammonia synthesis rate to 29.6 mmol h−1 gcat−1, which was higher than that of two more expensive, benchmark Ru‐based catalysts, which are also potential alternative catalysts. A kinetics analysis revealed that the addition of K enhanced the ammonia synthesis activity at ≥300 °C by changing the main adsorbed species from NH to N which can accelerate dissociative adsorption of nitrogen as the rate limiting step in ammonia synthesis.

DOI： 10.1002/cssc.202300942

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Oxidized Copper and Molybdenum Species Exclusively Boosting Electrocatalytic Hydrogen Evolution in Non-Extreme pH Carbonate Buffer Electrolyte Reviewed

Takeshi Nishimoto, Keisuke Obata, Hiroki Komiya, Takahiro Naito, Kazuki Harada, Masaaki Yoshida, Kazuhiro Takanabe

ACS Catalysis Vol. 13 ( 22 ) page： 14725 - 14736 2023.11

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Chemical Society (ACS)

DOI： 10.1021/acscatal.3c03821

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High Current Density Oxygen Evolution in Carbonate Buffered Solution Achieved by Active Site Densification and Electrolyte Engineering Reviewed Open Access

T. Nishimoto, T. Shinagawa, T. Naito, K. Harada, M. Yoshida, K. Takanabe

ChemSusChem Vol. 16 ( 1 ) page： e202201808 2023.1

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DOI： https://doi.org/10.1002/cssc.202201808

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High Current Density Oxygen Evolution in Carbonate Buffered Solution Achieved by Active Site Densification and Electrolyte Engineering Reviewed

T. Nishimoto, T. Shinagawa, T. Naito, K. Harada, M. Yoshida, K. Takanabe

ChemSusChem Vol. 16 ( 1 ) page： e202201808 2023.1

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Language：English Publishing type：Research paper (scientific journal) Publisher：Wiley

DOI： 10.1002/cssc.202201808

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Gas Crossover Regulation by Porosity-Controlled Glass Sheet Achieves Pure Hydrogen Production by Buffered Water Electrolysis at Neutral pH Reviewed Open Access

Takahiro Naito, Tatsuya Shinagawa, Takeshi Nishimoto, Kazuhiro Takanabe

ChemSusChem 2022.2

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DOI： https://doi.org/10.1002/cssc.202102294
Gas Crossover Regulation by Porosity-Controlled Glass Sheet Achieves Pure Hydrogen Production by Buffered Water Electrolysis at Neutral pH Reviewed

Takahiro Naito, Tatsuya Shinagawa, Takeshi Nishimoto, Kazuhiro Takanabe

ChemSusChem Vol. 15 ( 3 ) 2022.2

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1002/cssc.202102294

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Delivering the Full Potential of Oxygen Evolving Electrocatalyst by Conditioning Electrolytes at Near-Neutral pH. Reviewed Open Access

TakahiroNaito, Tatsuya Shinagawa, Takeshi Nishimoto, Kazuhiro Takanabe

ChemSusChem Vol. 14 page： 1554 - 1564 2021.3

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DOI： https://doi.org/10.1002/cssc.202002813

Open Access
Recent advances in understanding oxygen evolution reaction mechanisms over iridium oxide Reviewed Open Access

Takahiro Naito, Tatsuya Shinagawa, Takeshi Nishimoto, Kazuhiro Takanabe

Inorganic Chemistry Frontiers Vol. 8 page： 2900 - 2917 2021.1

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

DOI： https://doi.org/10.1039/D0QI01465F

Open Access
Microkinetic assessment of electrocatalytic oxygen evolution reaction over iridium oxide in unbuffered conditions Reviewed Open Access

Takeshi Nishimoto, Tatsuya Shinagawa, Takahiro Naito, Kazuhiro Takanabe

Journal of Catalysis Vol. 391 page： 435 - 445 2020.11

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1016/j.jcat.2020.09.007

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Water Electrolysis in Saturated Phosphate Buffer at Neutral pH Reviewed Open Access

Takahiro Naito, Tatsuya Shinagawa, Takeshi Nishimoto, Kazuhiro Takanabe

ChemSusChem Vol. 13 page： 5921 - 5933 2020.11

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DOI： doi.org/10.1002/cssc.202001886

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Presentations 18

Enhanced hydrogen evolution activity of NiMo catalysts through high-current electrodeposition in carbonate-buffered solution International conference

T. Naito, T. Li, K. Sato, K. Nagaoka

Pacifichem 2025 2025.12.18

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Event date： 2025.12

Language：English Presentation type：Oral presentation (general)

Venue：Hawaii Country：Japan
高純度水素の製造を可能とする中性pH水電解システムの開発

内藤剛大、高鍋和広

第130回触媒討論会 2022.9.20 触媒学会

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Event date： 2022.9

Language：Japanese Presentation type：Oral presentation (general)

Venue：富山大学
高純度水素の製造を可能とする中性pH水電解システムの開発

内藤剛大, 高鍋和広

第130回触媒討論会 2022.9.20 触媒学会

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Event date： 2022.9

Language：Japanese Presentation type：Oral presentation (general)

Venue：富山大学

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Densely-Buffered Electrolyte at Near-Neutral pH for Stable Operation of Water Electrolysis at Elevated Temperatures International conference

Takahiro Naito, Tatsuya SHinagawa, Kazuhiro Takanabe

17th International Congress on Catalysis 2020.6

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Event date： 2020.6

Language：English Presentation type：Poster presentation

Venue：San DIego, California Country：United States
Basic reactions of hydrogen production by I2-K2CO3 thermochemical cycle

2016.3.21

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Event date： 2016.3

Language：Japanese Presentation type：Oral presentation (general)
Generation of pure hydrogen via near-neutral pH water electrolysis

Takahiro Naito, Tatsuya Shinagawa, Kazuhiro Takanabe

2021

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Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
I2-K2CO3系ハイブリッド熱化学水素製造サイクルの基本反応の検討

内藤剛大、寺井隆幸

質量分析学会高温質量分析研究会 2015

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Language：Japanese Presentation type：Oral presentation (general)
Water Electrolysis in Saturated Phosphate Buffer at Neutral pH

Takahiro Naito, Tatsuya Shinagawa, Kazuhiro Takanabe

Chemical Society of Japan Annual Meeting 2021

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Language：English Presentation type：Oral presentation (general)

Country：Japan
Stable Operation of Water Electrolysis Enabled in Saturated Phosphate Buffer at Neutral pH International conference

Takahiro Naito, Tatsuya Shinagawa, Kazuhiro Takanabe

International Conference on Electrocatalysis for Renewable Energy 2021

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Language：English Presentation type：Poster presentation

Country：Netherlands
Stable Operation of Water Electrolysis in Saturated Phosphate Buffer at Neutral pH International conference

Takahiro Naito, Tatsuya SHinagawa, Kazuhiro Takanabe

ACS Spring 2021, 2021 ACS

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Language：English Presentation type：Oral presentation (general)

Country：United States
非貴金属二リン酸塩をベースとした水電解用酸素発生触媒の開発

北村昂也, 内藤剛大, 佐藤勝俊, 永岡勝俊

第132回触媒討論会 2023.9.14

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温和な条件でのアンモニア合成を志向した MgO担持 Fe触媒の開発

惠良康平, 宮原伸一郎, 内藤剛大, カニシュカシルヴァ, アクラミサイード, 山田博史, 佐藤勝俊, 稲津晃司, 永岡勝俊

第43回水素エネルギー協会大会・2023 HESS特別講演会 2023.12.13

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温和な反応条件下でのアンモニア合成を志向したK添加MgO担持Fe触媒の活性挙動

惠良康平, 宮原伸一郎, 内藤剛大, Silva, K. D, Akrami, S, 山田博史, 佐藤勝俊, 稲津晃司, 永岡勝俊

第 17 回触媒道場 2023.9.22

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担持型アンモニア合成触媒における活性抑制因子の速度論的検討

惠良康平, 宮原伸一郎, 内藤剛大, デシルヴァカニシュカ, アクラミサイード, 山田博史, 佐藤勝俊, 秋鹿研一, 稲津晃司, 永岡勝俊

第133回触媒討論会 2024.3.19

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低温・低圧条件下でのアンモニア合成を目指したMgO担持鉄触媒の開発

惠良康平, 宮原伸一郎, 内藤剛大, カニシュカシルヴァ, アクラミサイード, 山田博史, 佐藤勝俊, 稲津晃司, 永岡勝俊

第53回石油・石油化学討論会 2023.10.27

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NiとMoを基軸とした水電解用非貴金属系水素発生触媒の開発

LI TIANQI, 内藤剛大, 山田博史, 佐藤勝俊, 永岡勝俊

第 33 回キャラクタリゼーション講習会 2023.12.20

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Language：Japanese Presentation type：Poster presentation

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NiMo系水電解用水素発生触媒への第三元素添加効果

李天麒, 内藤剛大, 山田博史, 佐藤勝俊, 永岡勝俊

第133回触媒討論会 2024.3.18

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MgO担持Fe触媒によるアンモニア合成に対する塩基性酸化物ドープ効果

惠良康平, 宮原伸一郎, 内藤剛大, De Silva, K, Akrami, S, 山田博史, 佐藤勝俊, 稲津晃司, 永岡勝俊

第 33 回キャラクタリゼーション講習会 2023.12.20

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KAKENHI (Grants-in-Aid for Scientific Research) 3

Efficient water electrolysis achieved through bubble control

Grant number：25K17889 2025.4 - 2027.3

Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

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Authorship：Principal investigator

Grant amount：\4810000 （ Direct Cost: \3700000 、 Indirect Cost：\1110000 ）
Development of electrocatalysts for water electrolysis by tuning an electrolyte condition.

Grant number：23K13603 2023.4 - 2025.3

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

Naito Takahiro

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Authorship：Principal investigator

Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）

Improving the efficiency of water electrolyzers is essential for realizing a sustainable society. Despite the long history of water electrolysis, the development of electrode catalysts with significantly improved performance remains a critical challenge. This study focuses on neutral pH as a previously unexplored reaction environment and aims to design innovative electrocatalysts using element combinations suitable for operation under such conditions. The developed catalysts were systematically characterized using cyclic voltammetry, X-ray fluorescence spectroscopy, electron microscopy, and operando X-ray absorption spectroscopy (XAS).

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Development of AEM water electrolysis under no-extrem pH condition

Grant number：22K20479 2022.8 - 2024.3

Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity Start-up

Naito Takahiro

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Authorship：Principal investigator

Grant amount：\2860000 （ Direct Cost: \2200000 、 Indirect Cost：\660000 ）

The AEM water electrolyzer is considered as a next-generation water electrolysis system for the utilization of renewable energy. The application of non-extreme pH electrolyte to AEM water electrolysis has a potential to solve disadvantages of the conventional AEM water electrolyzer such as poor stability. Electrolyte properties were carefully tuned to improve the performance of the AEM-type water electrolysis system. An electrolysis cell was designed and used to water electrolysis testing. The developed AEM water electrolysis system using potassium carbonate buffer solution exhibited high stability, demonstrating the potential of non-extreme pH AEM-type water electrolysis.

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Industrial property rights 3

電極、水電解槽、水電解装置、二酸化炭素還元電解槽及び二酸化炭素電解装置

高鍋和広，品川竜也，西本武史，内藤剛大，市原健生，小島綾一

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Applicant：東京大学

Application no：特願2021-195780 Date applied：2021.12
電解槽及び水電解システム

高鍋和広，品川竜也，内藤剛大，西本武史，市原健生，小島綾一

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Applicant：東京大学

Application no：特願2021-165732 Date applied：2021.10
中性pH水電解方法及びそのシステム

高鍋和広，品川竜也，内藤剛大，西本武史

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Applicant：東京大学

Application no：特願2020-012202 Date applied：2020.1

Announcement no：特開2021-116468 Date announced：2021.8

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