2021/12/01 更新

写真a

ツボノウチ ユウタ
坪ノ内 優太
TSUBONOCHI Yuta
所属
教育研究院 自然科学系 特任助教
工学部 特任助教
職名
特任助教
外部リンク

学位

  • 博士(理学) ( 2018年3月   九州大学 )

研究キーワード

  • 人工光合成

  • 酸化還元反応

  • 遷移金属錯体

研究分野

  • ナノテク・材料 / 無機・錯体化学  / 錯体化学

経歴(researchmap)

  • 新潟大学   自然科学系   特任助教

    2018年4月 - 現在

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経歴

  • 新潟大学   工学部   特任助教

    2018年4月 - 現在

  • 新潟大学   教育研究院 自然科学系   特任助教

    2018年4月 - 現在

所属学協会

 

論文

  • Facile Fabrication of a Highly Crystalline and Well-Interconnected Hematite Nanoparticle Photoanode for Efficient Visible-Light-Driven Water Oxidation

    Tomohiro Katsuki, Zaki N. Zahran, Kou Tanaka, Tatsuya Eo, Eman A. Mohamed, Yuta Tsubonouchi, Mohamed R. Berber, Masayuki Yagi

    ACS Applied Materials & Interfaces   13 ( 33 )   39282 - 39290   2021年8月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Chemical Society (ACS)  

    DOI: 10.1021/acsami.1c08949

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  • Highly selective electrocatalysis for carbon dioxide reduction to formic acid by a Co(II) complex with an equatorial N4 ligand 査読

    Yuta Tsubonouchi, Daiki Takahashi, Mohamed R. Berber, Eman A. Mohamed, Zaki N. Zahran, Asma M. Alenad, Numa A. Althubiti, Masayuki Yagi

    Electrochimica Acta   138545 - 138545   2021年5月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier BV  

    DOI: 10.1016/j.electacta.2021.138545

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  • Handy Protocol of Nitrogen-Doped BiVO4 Photoanode for Visible Light-Driven Water Oxidation 査読

    Tatsuya Eo, Tomohiro Katsuki, Mohamed R. Berber, Zaki N. Zahran, Eman A. Mohamed, Yuta Tsubonouchi, Asma M. Alenad, Numa A. Althubiti, Masayuki Yagi

    ACS Applied Energy Materials   4 ( 4 )   2983 - 2989   2021年4月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Chemical Society (ACS)  

    DOI: 10.1021/acsaem.1c00261

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  • Concisely Synthesized FeNiWOx Film as a Highly Efficient and Robust Catalyst for Electrochemical Water Oxidation 査読

    Zaki N. Zahran, Eman A. Mohamed, Yuta Tsubonouchi, Manabu Ishizaki, Takanari Togashi, Masato Kurihara, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    ACS Applied Energy Materials   4 ( 2 )   1410 - 1420   2021年2月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Chemical Society (ACS)  

    DOI: 10.1021/acsaem.0c02628

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  • Electrocatalytic water splitting with unprecedentedly low overpotentials by nickel sulfide nanowires stuffed into carbon nitride scabbards

    Zaki N. Zahran, Eman A. Mohamed, Yuta Tsubonouchi, Manabu Ishizaki, Takanari Togashi, Masato Kurihara, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    Energy & Environmental Science   14 ( 10 )   5358 - 5365   2021年

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Royal Society of Chemistry (RSC)  

    The unprecedentedly low overpotential of 32 mV for oxygen evolution was attained by forming a unique motif of NiS<sub><italic>x</italic></sub> nanowires stuffed into C<sub>3</sub>N<sub>4</sub> scabbards. With this system, electrocatalytic water splitting was demonstrated at the lowest overall overpotential of 72 mV.

    DOI: 10.1039/d1ee00509j

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  • High Potential-Applied Catalyst Behavior of a Mononuclear Ruthenium(II) Complex on a Mesoporous ITO Electrode for Water Oxidation 査読

    Yuta Tsubonouchi, Yuki Tanahashi, Tatsuya Eo, Junichiro Honta, Taisei Sato, Eman A. Mohamed, Zaki N. Zahran, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    Journal of The Electrochemical Society   167 ( 16 )   166515 - 166515   2020年12月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:The Electrochemical Society  

    DOI: 10.1149/1945-7111/abd3ba

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    その他リンク: https://iopscience.iop.org/article/10.1149/1945-7111/abd3ba/pdf

  • Efficient Electrocatalytic Water Oxidation by a Dinuclear Ruthenium(II) Complex with Vicinal Aquo and Hydroxo Groups Adsorbed on a TiO2 Electrode 査読

    Yuki Tanahashi, Sho Nagai, Yuta Tsubonouchi, Masanari Hirahara, Taisei Sato, Eman A. Mohamed, Zaki N. Zahran, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    ACS Applied Energy Materials   3 ( 12 )   12172 - 12184   2020年12月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Chemical Society (ACS)  

    DOI: 10.1021/acsaem.0c02242

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  • Molecular aspects, electrochemical properties and water oxidation catalysis on a nanoporous TiO<inf>2</inf> electrode anchoring a mononuclear ruthenium(II) aquo complex 査読

    Yuta Tsubonouchi, Tatsuya Eo, Junichiro Honta, Taisei Sato, Eman A. Mohamed, Zaki N. Zahran, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    Journal of Photochemistry and Photobiology A: Chemistry   400   2020年9月

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    掲載種別:研究論文(学術雑誌)  

    © 2020 A mononuclear Ru aquo complex, [Ru(C8Otpy)(H2dcbpy)(OH2)]2+ (C8Otpy = 4′-octyloxy-2,2′:6′,2′′-terpyridine, H2dcbpy = 4,4′-dicarboxy-2,2′-bipyridine) was stably adsorbed on a nanoporous TiO2 surface to afford a TiO2 electrode anchoring the complex. The adsorption isothermal of the complex on the TiO2 surface was analyzed by the Langmuir adsorption model to provide a maximum coverage of Гmax = 4.4 × 10−8 mol cm−2 and an adsorption equilibrium constant of Kads = 1.1 × 104 M−1, suggesting that the monolayer of the complex is formed on the TiO2 surface. The cyclic voltammetry measurement of the complex on the TiO2 surface suggested the diffusion-controlled charge transport via electron hopping between the complexes through the TiO2 layer. Pourbaix diagram showed that the complex undergoes a non-H+-coupled 1e- redox reaction of a RuIIOH/RuIIIOH pair of the complex on the TiO2 electrode due to pH buffering ability of the TiO2 surface in a range of pH 5−11. Bulk electrolysis at 1.7 V vs Ag/AgCl using the complex-anchoring TiO2 electrode provided a high and steady catalytic current density of 0.39 mA cm−2 with 83 % Faradaic efficiency for O2 evolution during 1 h electrolysis. However, we presume that the complex is transformed to RuOx nanoparticles on the TiO2 electrode during the electrocatalysis, on the basis of our earlier report on the complex / mesoporous ITO electrode system (Dalton Trans., 2020, 49, 1416−1423.). The RuOH/TiO2 electrode is the efficient anode for water oxidation under the acidic conditions, irrespective of the molecular catalyst of RuOH and the alternative catalysts formed via its oxidative transformation.

    DOI: 10.1016/j.jphotochem.2020.112696

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  • FeNi Layered Double Hydroxide Nanoflakes with Potential for Intrinsically High Water-Oxidation Catalytic Activity 査読

    Manabu Ishizaki, Hiroya Tanno, Hikaru Sutoh, Tomohiro Katsuki, Taichi Hayasaka, Masayuki Yagi, Yuta Tsubonouchi, KAZUKI TAJIMA, Tohru Kawamoto, Yusuke Sakuda, Masato Kurihara

    ACS Applied Energy Materials   3 ( 9 )   9040 - 9050   2020年8月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:American Chemical Society (ACS)  

    DOI: 10.1021/acsaem.0c01439

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  • Highly Efficient and Selective Electrocatalytic CO2-to-CO Conversion by a Non-heme Iron Complex with an In-Plane N-4 Ligand in Heterogeneous Aqueous Media 査読

    Eman A. Mohamed, Zaki N. Zahran, Yuta Tsubonouchi, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    ACS APPLIED ENERGY MATERIALS   3 ( 5 )   4114 - 4120   2020年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

    A non-heme Fe complex with a tetradentate dicarboxamide N-4 in-plane ligand works efficiently and selectively for the electrocatalytic CO2-to-CO conversion in a homogeneous DMF solution. The complex was immobilized on a nitrogen-doped graphene (N-G) to achieve a CO2-to-CO conversion in neutral aqueous NaHCO3 solutions, affording CO with Faradaic efficiency of 90%, a current density of 6 mA cm(-2), and a turnover frequency of 2.1 s(-1), at an overpotential of 0.47 V, which is among those of the hitherto-reported efficient and selective Fe complexes electrocatalysts.

    DOI: 10.1021/acsaem.9b02548

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  • Multi-potential-step chronocoulospectrometry for electrocatalytic water oxidation by a mononuclear ruthenium aquo complex immobilized on a mesoporous ITO electrode. 査読 国際誌

    Yuta Tsubonouchi, Junichiro Honta, Taisei Sato, Eman A Mohamed, Zaki N Zahran, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    Dalton transactions (Cambridge, England : 2003)   49 ( 5 )   1416 - 1423   2020年2月

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    記述言語:英語  

    A new mononuclear Ru aquo complex [Ru(C8Otpy)(H2dcbpy)(OH2)]2+ with 4,4'-dicarboxy-2,2'-bipyridine (H2dcbpy) and 4'-octyloxy-2,2':6',2''-terpyridine (C8Otpy) ligands was synthesized to investigate electrocatalytic water oxidation by the complex immobilized on a mesoporous indium-doped tin oxide (meso-ITO) electrode using a multi-potential-step chronocoulospectrometric (MPSCCS) technique. UV-visible absorption spectroscopic data indicated that [Ru(C8Otpy)(dcbpy)(OH2)] (RuOH2) is deprotonated to [Ru(C8Otpy)(dcbpy)(OH)]- (RuOH) on the meso-ITO surface even at pH 5.9 of the electrolyte solution. The cyclic voltammogram (CV) of the RuOH/meso-ITO electrode showed a pH-independent redox response at E1/2 = 0.80 V vs. Ag/AgCl in the pH range of 5-12, being assigned to a non-proton-coupled 1e- redox process of RuIIOH/RuIIIOH. The MPSCCS measurement of the RuOH/meso-ITO electrode between 0.2 and 1.5 V vs. Ag/AgCl showed that RuIV species (tentatively RuIVO) exist in a steady state of the electrocatalysis in the initial stage. This suggests that the electrochemical oxidation from RuIVO to RuVO could compete with the water nucleophilic attack for O-O bond formation involved in the rate-determining step under the employed conditions. The possibility that the water nucleophilic attack on RuIVO could also compete with the electrochemical oxidation of RuIVO to RuVO was suggested by the electrocatalytic water oxidation at a low applied potential of 1.4 V prior to the formation potential of RuVO. The MPSCCS measurement at 1.4 V for 1 h showed that RuOH is gradually transformed into an alternative catalyst (most likely RuOx nanoparticles) on the electrode. The MPSCCS technique is promising to reveal the redox reactions and catalytic aspects of molecular catalysts immobilized on an electrode for water oxidation.

    DOI: 10.1039/c9dt04442f

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  • Characterization and Mechanism of Efficient Visible-Light-Driven Water Oxidation on an in Situ N-2-Intercalated WO3 Nanorod Photoanode 査読

    Debraj Chandra, Dong Li, Tetsuya Sato, Yuki Tanahashi, Takanari Togashi, Manabu Ishizaki, Masato Kurihara, Eman A. Mohamed, Yuta Tsubonouchi, Zaki N. Zahran, Kenji Saito, Tatsuto Yui, Masayuki Yagi

    ACS SUSTAINABLE CHEMISTRY & ENGINEERING   7 ( 21 )   17896 - 17906   2019年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

    Nanorod architecture of a N-2-intercalated WO3 photoanode has been developed by emphasizing the dual role of N2H4, which functioned simultaneously as a structure-directing agent and as a nitrogen source for in situ N-2 intercalation. The N content for WO3-N2H4 increased with increase of calcination temperature from 350 to 420 degrees C and thereafter decreased up to 550 degrees C. This is different from the monotonously decreased N content with the calcination temperature increase for WO3-NH3. X-ray diffraction data indicated that the phase-pure monoclinic WO3 crystals are formed over 350 degrees C calcination for WO3-N2H4, in contrast to a mixed phase of hexagonal and monoclinic WO3 crystals below 500 degrees C for WO3-NH3. The crystallinity of the monoclinic phase for WO3-N2H4 is higher than those of WO3-neat and WO3-NH3 at each calcination temperature of 350-550 degrees C. The beta values of lattice parameters of the monoclinic phase changed significantly with the calcination temperature; this is consistent with the calcination temperature dependence of the N content, clarifying the intercalation of N-2 in the WO3 lattice. The UV-visible diffuse reflectance spectra of WO3-N2H4 exhibited a shoulder at 470-630 nm, which became more intense as the calcination temperature increased from 350 degrees C and then decreased up to 550 degrees C through the maximum at 420 degrees C. This temperature dependence is consistent with the cases of the N content and the lattice parameter of beta. This indicates that N-2 intercalation into the WO3 lattice is responsible for the considerable red shift in the absorption edge, with a new shoulder appearing at 470-630 nm due to transition from a new intermediate N 2p orbital formed in the conduction band of WO3. Based on this transition, the WO3-N2H4 photoanode can utilize the visible light in longer wavelength below 520 nm for photoelectrochemical water oxidation compared to 470 nm for WO3-neat. The high incident photon-to-current conversion efficiency of the WO3-N2H4 photoanode is due to efficient electron transport through the WO3 nanorod film.

    DOI: 10.1021/acssuschemeng.9b04467

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  • Critical Hammett Electron-Donating Ability of Substituent Groups for Efficient Water Oxidation Catalysis by Mononuclear Ruthenium Aquo Complexes. 査読

    Watabe S, Tanahashi Y, Hirahara M, Yamazaki H, Takahashi K, Mohamed EA, Tsubonouchi Y, Zahran ZN, Saito K, Yui T, Yagi M

    Inorganic chemistry   58 ( 19 )   12716 - 12723   2019年10月

  • Recent Advances in the Development of Molecular Catalyst-Based Anodes for Water Oxidation toward Artificial Photosynthesis. 査読

    Zahran ZN, Tsubonouchi Y, Mohamed EA, Yagi M

    ChemSusChem   12 ( 9 )   1775 - 1793   2019年5月

  • Mechanisms of water oxidation using ruthenium, cobalt, copper, and iron molecular catalysts 査読

    Alexander Rene Parent, Takashi Nakazono, Yuta Tsubonouchi, Natsuki Taira, Ken Sakai

    Advances in Inorganic Chemistry   74   197 - 240   2019年1月

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    © 2019 Elsevier Inc. This review focuses on the studies of molecular water oxidation catalysts based on ruthenium, cobalt, copper, and iron, with emphasis given to the works undertaken thus far by the authors&#039; group in the last decade. A particular emphasis is given on our mechanistic studies of water oxidation, and the involvement of the chemical oxidants employed in the catalytic mechanism.

    DOI: 10.1016/bs.adioch.2019.04.001

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  • Light-induced water oxidation catalyzed by an oxido-bridged triruthenium complex with a Ru-O-Ru-O-Ru motif 査読

    Yuta Tsubonouchi, Shu Lin, Alexander R. Parent, Gary W. Brudvig, Ken Sakai

    CHEMICAL COMMUNICATIONS   52 ( 51 )   8018 - 8021   2016年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

    A mu-oxido-bridged triruthenium complex (RuT2+), formed by air oxidation of a previously reported monoruthenium water-oxidation catalyst (WOC), serves as an efficient photochemical WOC with the turnover frequency (TOF) and turnover number (TON) 0.90 s(-1) and 610, respectively. The crystal structures of RuT2+ and its one-electron oxidized RuT3+ are also reported.

    DOI: 10.1039/c6cc02816k

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▶ 全件表示

書籍等出版物

  • Ruthenium - an element loved by researchers 査読

    Y. Tsubonouchi, E. A. Mohamed, Z. N. Zahran, M. Yagi( 担当: 分担執筆 ,  範囲: Mechanisms of photoisomerization and water oxidation catalysis of ruthenium(II) aquo complexes)

    IntechOpen  2021年9月 

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  • Advances in Chemistry Research

    Y. Tsubonouchi, Y. Tanahashi, M. Hirahara, E. A. Mohamed, Z. N. Zahran, M. Yagi( 担当: 分担執筆 ,  範囲: Chapter 5: Catalytic aspects and mechanisms of water oxidation by mononuclear ruthenium(ii) aquo complexes)

    Nova Science Publishers, Inc  2020年10月 

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  • Springer Handbook of Inorganic Photochemistry 査読

    Z. N. Zahran, Y. Tsubonouchi, E. A. Mohamed, M. Yagi( 担当: 分担執筆 ,  範囲: Chapter 5: Water oxidation using molecular photocatalysts)

    Springer  2020年 

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  • Photoisomerization: Causes, Behavior and Effects

    Y. Tanahashi, S. Watabe, E. A. Mohamed, Y. Tsubonouchi, Z. N. Zahran, M. Hirahara, M. Yagi( 担当: 分担執筆 ,  範囲: Chapter 2: Photoisomerization of polypyridyl ruthenium(II) aquo complexes)

    Nova Science Publishers, Inc.  2019年5月 

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MISC

  • 遷移金属錯体を触媒とした可視光駆動水の酸化反応

    坪ノ内優太, 八木政行

    光化学協会会誌   52 ( 1 )   10 - 16   2021年4月

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  • 酸化イリジウムのナノ構造制御による酸素発生アノード触媒の開発 (特集 人工光合成研究の最前線)

    坪ノ内 優太, 江尾 達矢, 八木 政行

    エネルギー・資源 = Energy and resources   41 ( 3 )   167 - 173   2020年5月

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    記述言語:日本語   出版者・発行元:エネルギー・資源学会  

    CiNii Article

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  • 1C-02 Photochemical water oxidation by an oxido-bridged triruthenium complex (討論会レビュー) -- (学生講演賞)

    坪ノ内 優太

    Bulletin of Japan Society of Coordination Chemistry   ( 69 )   59 - 62   2017年5月

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    記述言語:日本語   出版者・発行元:錯体化学会  

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  • ルテニウム錯体を触媒とする水からの酸素発生反応 : 反応メカニズムから導かれる分子設計指針 (特集 植物に学ぶ : 人工光合成の最新動向)

    坪ノ内 優太, 酒井 健

    光アライアンス   25 ( 7 )   15 - 20   2014年7月

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    記述言語:日本語   出版者・発行元:日本工業出版  

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産業財産権

  • ゲル、シート、光機能性材料、光学デバイスおよびゲルの製造方法

    赤嶺 経太, 寺田 侑平, 久宗 穣, 坪ノ内 優太, 小簑 剛

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    出願人:国立大学法人九州大学

    出願番号:特願2016-221958  出願日:2016年11月

    公開番号:特開2018-080228  公開日:2018年5月

    J-GLOBAL

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受賞

  • 錯体化学会第66回討論会学生講演賞

    2016年   錯体化学会  

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共同研究・競争的資金等の研究

  • 異種金属イオン間での分子内O-O結合形成機構に立脚した新規酸素発生錯体触媒の創製

    2018年4月 - 2020年3月

    日本学術振興会  研究活動スタート支援 

    坪ノ内優太

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    担当区分:研究代表者  資金種別:競争的資金

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