Reviews / 総説
“Two-electron Redox Chemistry of Nitroxide Radicals: Fundamental Mechanisms and Applications in Energy Storage”, ACS Electrochem., 1, 123-137 (2025). DOI: 10.1021/acselectrochem.4c00119
｢レドックス高分子システムによる有機デバイスの機能創発｣, 高分子, 74, 12-14 (2025).
“Reversible and High-density Energy Storage with Polymers Populated with Bistable Redox Sites”, Polym. J., 56, 127-144 (2024). DOI: 10.1038/s41428-023-00857-7 (Open Access)
“Redox: Organic Robust Radicals and Their Polymers for Energy Conversion/Storage Devices”, Chem. Rev., 123, 11336-11391 (2023). DOI: 10.1021/acs.chemrev.3c00172
“Nitroxide Radical Polymers for Emerging Plastic Energy Storage and Organic Electronics: Fundamentals, Materials, and Applications”, Mater. Horiz., 8, 803-829 (2021). DOI: 10.1039/D0MH01391A
“有機ポリマー電池の研究動向”, 高分子, 69, 104-106 (2020).
“有機材料でいかに電荷を貯蔵するか: 単一分子のレドックス反応から有機蓄電材料への展開” 『有機材料で電荷貯蔵～省資源と高性能は両立できるか』, 化学と工業, 71, 462-464 (2018).
“酸化還元活性な高分子による集合組織の動的制御”『2018年の化学: 最新のトピックス』, 化学, 73, 70-71 (2018).
“空気電池: 有機負極を目指したポリマー膜の設計”, 膜, 38, 131-136 (2013). DOI: 10.5360/membrane.38.131
“Organic Radical Battery Approaching Practical Use”, Chem. Lett. (Highlight Review), 40, 222-227 (2011). DOI: 10.1246/cl.2011.222
“Radical Polymers for Organic Electronics: A Radical Departure from Conjugated Polymers?”, Adv. Mater., 21, 2339-2344 (2009). DOI: 10.1002/adma.200803554
“Toward Flexible Batteries”, Science, 319, 737-738 (2008). DOI: 10.1126/science.1151831
“ラジカル電池: 有機ラジカルポリマーの電極反応に基づく二次電池”, 化学と教育, 56, 118-119 (2008). DOI: 10.20665/kakyoshi.56.3_118
Selected Papers / 主要論文
(1) Organic Electron-transfer Process: redox, exchange, transport & electronic interaction / 有機電子移動過程: 電子授受, 交換, 輸送および電子的相互作用
“Precise Control of Protonation of Phenazine-TEMPO-Coupled Hybrid for Fully Reversible Bipolar Redox Process in Aqueous Electrolytes”, Macromol. Res., 34, 607-613 (2026). DOI: 10.1007/s13233-026-00503-0
“Anomalous Potential Shifts of Redox-active Molecules in Highly Concentrated Electrolytes”, Chem. Lett., 50, 1375-1377 (2021). DOI: 10.1246/cl.210124
“Electrochemical Characterization and Thermodynamic Analysis of TEMPO Derivatives in Ionic Liquids”, Phys. Chem. Chem. Phys., 23, 10205-10217 (2021). DOI: 10.1039/D0CP05350C
“Diffusion-cooperative Model for Charge Transport by Redox-active Nonconjugated Polymers”, J. Am. Chem. Soc., 140, 1049-1056 (2018). DOI: 10.1021/jacs.7b11272
“Command Surface of Self-organizing Structures by Radical Polymers with Cooperative Redox Reactivity”, J. Am. Chem. Soc., 139, 13600-13603 (2017). DOI: 10.1021/jacs.7b06879
“Grafted Radical Polymer Brush for Surface-driven Switching of Chiral Nematic Liquid Crystals”, Polym. J., 49, 691-693 (2017). DOI: 10.1038/pj.2017.43
“Redox Mediation through TEMPO-substituted Polymer with Nanogap Electrodes for Electrochemical Amplification”, Chem. Lett., 46, 647-650 (2017). DOI: 10.1246/cl.170055
“Electrochemical Current Rectification with Cross Reaction at a TEMPO/viologen-substituted Polymer Thin-layer Heterojunction”, RSC Adv., 6, 99195-99201 (2016). DOI: 10.1039/c6ra23124a
“Dynamic Switching of Ionic Conductivity by Cooperative Interaction of Polyviologen and Liquid Crystals for Efficient Charge Storage”, J. Mater. Chem. A, 4, 3249-3252 (2016). DOI: 10.1039/c6ta00320f (Open Access)
“Ionic Liquid-inspired Redox Shuttles: Properties of a Ferrocenylimidazolium Salt as an Efficient Mediator for Dye-sensitized Solar Cell”, Chem. Lett., 43, 1134-1136 (2014). DOI: 10.1246/cl.140276
“TEMPO/viologen Electrochemical Heterojunction for Diffusion Controlled Redox Mediation: A Highly Rectifying Bilayer-sandwiched Device Based on Cross Reaction at Interface between Dissimilar Redox Polymers”, ACS Appl. Mater. Interfaces, 6, 4043-4049 (2014). DOI: 10.1021/am405527y
“Enhanced Bimolecular Exchange Reaction through Programmed Coordination of a Five-coordinate Oxovanadium Complex for Efficient Redox Mediation in Dye-sensitized Solar Cells”, Dalton Trans., 42, 16090-16095 (2013). DOI: 10.1039/C3DT51698A
“Nitroxide Radical Molecules as Highly Reactive Redox Mediators in Dye-sensitized Solar Cells”, Angew. Chem. Int. Ed., 124, 10324-10327 (2012). DOI: 10.1002/ange.201205036
“Electrolyte Anion-assisted Charge Transportation in Poly(oxoammonium cation/nitroxyl radical) Redox Gels”, J. Mater. Chem., 22, 13669-13673 (2012). DOI: 10.1039/c2jm31907a
“Synthesis of Amphiphilic Block Copolymers Bearing Stable Nitroxyl Radicals”, J. Polym. Sci., A, 48, 5404-5410 (2010). DOI: 10.1002/pola.24345
“Nanolithographic Patterning via Electrochemical Oxidation of Stable Poly(nitroxide radical)s to Poly(oxoammonium salt)s”, J. Mater. Chem., 20, 9616-9618 (2010). DOI: 10.1039/c0jm02241a
“Electronic Communication in the Formation of a Quartet Molecule 2,6,10-Tris[bis(p-methoxyphenyl)aminium]triphenylene”, Chem. Lett., 39, 356-357 (2010). DOI: 10.1246/cl.2010.356
“Nitroxide Radicals for Highly Efficient Redox Mediation in Dye-sensitized Solar Cells”, Chem. Lett., 39, 464-465 (2010). DOI: 10.1246/cl.2010.464
“Synthesis of Poly(oxoammonium salt)s and Their Electrical Properties in the Organic Thin Film Device”, Chem. Lett., 38, 1160-1161 (2009). DOI: 10.1246/cl.2009.1160
“Nernstian Adsorbate-like Bulk Layer of Organic Radical Polymers for High-density Charge Storage Purposes”, J. Am. Chem. Soc., 130, 14459-14461 (2008). DOI: 10.1021/ja803742b
“Battery-inspired Non-volatile and Rewritable Memory Architectures: a Radical Polymer-based Organic Device”, J. Am. Chem. Soc., 129, 14128-14129 (2007). DOI: 10.1021/ja075553p
“Structural Implication of Oxoammonium Cations for Reversible Organic One-electron Redox Reaction to Nitroxide Radicals”, Chem. Lett., 36, 866-867 (2007). DOI: 10.1246/cl.2007.866
“Electron-transfer Kinetics of Nitroxide Radicals as an Electrode-active Material”, Bull. Chem. Soc. Jpn., 77, 2203-2204 (2004). DOI: 10.1246/bcsj.77.2203
“Electrochemical and Ferromagnetic Couplings in 4,4’,4’’-(1,3,5-Benzenetryl)tris(phenoxyl) Radical Formation”, J. Org. Chem., 66, 1680-1685 (2001). DOI: 10.1021/jo0013204
“Polysulfonium as a New Electrode-modifying Polyelectrolyte”, J. Electroanal. Chem., 498, 232-236 (2001). DOI: 10.1016/S0022-0728(00)00383-1
“High-spin Polyphenoxyl Based on Poly(1,4-phenyleneethynylene)”, J. Org. Chem., 64, 7129-7134 (1999). DOI: 10.1021/jo990691l
“Synthesis and Characterization of Nickel Dithiocarbamate Complexes Bearing Ferrocenyl Subunits”, Chem. Eur. J., 5, 3193-3201 (1999). DOI: 10.1002/(SICI)1521-3765(19991105)5:11<3193::AID-CHEM3193>3.0.CO;2-5
(2) Organic Electrode-active Material / 有機電極活物質“Quadruply Fused Aromatic Heterocycles toward 4 V-class Robust Organic Cathode-active Materials”, Batteries Supercaps, 5, e202200178 (2022). DOI: 10.1002/batt.202200178
“A PROXYL-type Norbornene Polymer for High-voltage Cathodes in Lithium Batteries”, Macromol. Rapid Commun., 42, 2100374 (2021). DOI: 10.1002/marc.202100374
“Unraveling Kinetics and Mass Transport Effects on Two-electron Storage in Radical Polymer Batteries”, J. Mater. Chem. A, 9, 13071-13079 (2021). DOI: 10.1039/D1TA03449A
“TEMPO-substituted Poly(ethylene sulfide) for Solid-state Electro-chemical Charge Storage”, Macromol. Rapid Commun., 42, 2000607 (2021). DOI: 10.1002/marc.202000607
“Metal-free, Solid-state, and Paper-like Rechargeable Batteries Consisting of Redox-active Polyethers”, ChemSusChem, 13, 2443-2448 (2020). DOI: 10.1002/cssc.201903175
“A Highly Flexible Yet >300 mAh cm-3 Energy Density Lithium-ion Battery Assembled with the Cathode of a Redox-active Polyether Binder”, Energy Technol., 8, 1901159 (2019). DOI: 10.1002/ente.201901159
“Characterization of PEDOT-quinone Conducting Redox Polymers in Water-in-salt Electrolytes for Safe and High-Energy Li-Ion Batteries”, Electrochem. Commun., 105, 106489 (2019). DOI: 10.1016/j.elecom.2019.106489
“n-Type Redox-active Benzoylpyridinium-substituted Supramolecular Gel for an Organogel-based Rechargeable Device”, Chem. Lett., 48, 555-557 (2019). DOI: 10.1246/cl.190085
“Full Organic Aqueous Battery Based on TEMPO Small Molecule with Millimeter-thick Electrodes”, Chem. Mater., 31, 1869-1880 (2019). DOI: 10.1021/acs.chemmater.8b03282
“Toward Improved Performance of All-organic Nitroxide Radical Batteries with Ionic Liquids: A Theoretical Perspective”, ACS Sustainable Chem. Eng., 7, 5367-5375 (2019). DOI: 10.1021/acssuschemeng.8b06393
“Ultrathin and Stretchable Rechargeable Devices with Organic Polymer Nanosheets Conformable to Skin Surface”, Small, 15, 1805296 (2019). DOI: 10.1002/smll.201805296
“Poly(vinyldibenzothiophenesulfone): Its Redox Capability at Very Negative Potential Toward an All-organic Rechargeable Device with High-energy Density”, Adv. Funct. Mater., 28, 1805858 (2018). DOI: 10.1002/adfm.201805858
“An Ultrahigh Output Rechargeable Electrode of a Hydrophilic Radical Polymer/nanocarbon Hybrid with an Exceptionally Large Current Density beyond 1 A cm−2”, Adv. Mater., 30, 1800900 (2018). DOI: 10.1002/adma.201800900
“Poly(diphenanthrenequinone-substituted norbornene) for Long Life and Efficient Lithium Battery Cathodes”, Bull. Chem. Soc. Jpn., 91, 721-727 (2018). DOI: 10.1246/bcsj.20170420
“Supramolecular Organic Radical Gels Formed with 2,2,6,6-Tetramethylpiperidin-1-oxyl-substituted Cyclohexanediamines: A Very Efficient Charge-transporting and -Storable Soft Material”, Chem. Mater., 29, 5942-5947 (2017). DOI: 10.1021/acs.chemmater.7b01476
“Totally Organic-based Bendable Rechargeable Devices Composed of Hydrophilic Redox Polymers and Aqueous Electrolyte”, Chem. Lett., 46, 693-694 (2017). DOI: 10.1246/cl.170111
“Charge-discharge with Rocking-chair-type Li+Migration Characteristics in a Zwitterionic Radical Copolymer Composed of TEMPO and Trifluoromethanesulfonylimide with Carbonate Electrolytes for a High-rate Li-Ion Battery”, Macromolecules, 50, 1950-1958 (2017). DOI: 10.1021/acs.macromol.6b02404
“Poly(norbornyl-NDIs) as a Potential Cathode-active Material in Rechargeable Charge Storage Devices”, RSC Adv., 6, 42911-42916 (2016). DOI: 10.1039/C6RA06103F (Open Access)
“Synthesis of Poly(TEMPO-substituted Glycidyl Ether) by Utilizing t-BuOK/18-crown-6 for an Organic Cathode-active Material”, Macromol. Symp., 351, 90-96 (2015). DOI: 10.1002/masy.201300224
“Facile Charge Transport and Storage by a TEMPO-populated Redox Mediating Polymer Integrated with Polyaniline as Electrical Conducting Path”, Polym. J., 47, 212-219 (2015). DOI: 10.1038/pj.2014.124 (Open Access)
“Efficient Charge Transport of a Radical Polyether/SWCNT Composite Electrode for an Organic Radical Battery with High Charge-storage Density”, RSC Adv., 5, 15448-15452 (2015). DOI: 10.1039/c4ra15949g
“Anionic Polymerization of 4-Methacryloyloxy-TEMPO Using an MMA-capped Initiator”, ACS Macro Lett., 3, 240-243 (2014). DOI: 10.1021/mz400644y
“Redox Equilibrium of a Zwitterionic Radical Polymer in a Non-aqueous Electrolyte for Novel Li+Host Material in a Li-ion Battery”, J. Mater. Chem. A, 1, 9608-9611 (2013). DOI: 10.1039/C3TA12076G
“Synthesis of Pendant Nitronyl Nitroxide Radical-containing Poly(norbornene)s as Ambipolar Electrode-active Materials”, Macromolecules, 46, 1361-1367 (2013). DOI: 10.1021/ma302278h
“Robust and Efficient Charge Storage by Uniform Grafting of TEMPO Radical Polymer around Multi-walled Carbon Nanotubes”, J. Mater. Chem. A, 1, 2999-3003 (2013). DOI: 10.1039/c3ta01588b
“Polyviologen Hydrogel with High-rate Capability for Anodes toward an Aqueous Electrolyte-type and Organic-based Rechargeable Device”, ACS Appl. Mater. Interfaces, 5, 1355-1361 (2013). DOI: 10.1021/am302647w
“Self-doping Inspired Zwitterionic Pendant Design of Radical Polymers toward a Rocking-chair-type Organic Cathode-active Material”, J. Mater. Chem. A, 1, 1326-1333 (2013). DOI: 10.1039/c2ta00785a
“Radical Polymer-wrapped SWNTs at a Molecular Level: High-rate Redox Mediation through a Percolation Network for a Transparent Charge-storage Material”, Adv. Mater., 23, 4440-4443 (2011). DOI: 10.1002/adma.201102372
“Functionalization of Poly(4-chloromethylstyrene) with Anthraquinone Pendants for Organic Anode-active Materials”, Polym. Adv. Technol., 22, 1242-1247 (2011). DOI: 10.1002/pat.1968
“Designing Current Collector/composite Electrode Interfacial Structure of Organic Radical Battery”, J. Power Sources, 196, 7806-7811 (2011). DOI: 10.1016/j.jpowsour.2010.10.092
“P- and N-Type Bipolar Redox-active Radical Polymer: Toward Totally Organic Polymer-based Rechargeable Devices with Variable Configuration”, Adv. Mater.,23, 751-754 (2011). DOI: 10.1002/adma.201003525
“Dual Dopable Poly(phenylacetylene) with Nitronyl Nitroxide Pendants for Reversible Ambipolar Charging and Discharging”, Chem. Lett. (Editor’s Choice), 40, 184-185 (2011). DOI: 10.1246/cl.2011.184 (Open Access)
“Synthesis and Charge Transport Properties of Redox-active Nitroxide Polyethers with Large Site Density”, Macromolecules, 43, 10382-10389 (2010). DOI: 10.1021/ma1020159
“A TEMPO-substituted Polyacrylamide as a New Cathode Material: an Organic Rechargeable Device Composed of Polymer Electrodes and Aqueous Electrolyte”, Green. Chem., 12, 1573-1575 (2010). DOI: 10.1039/B926296B
“Improving Charge/discharge Properties of Radical Polymer Electrodes Influenced Strongly by Current Collector/carbon Fiber Interface”, J. Phys. Chem. B, 114, 8335-8340 (2010). DOI: 10.1021/jp1019526
“Biodegradable and Electroactive TEMPO-substituted Acrylamide/Lactide Copolymer”, Macromol. Biosci., 10, 1203-1209 (2010). DOI: 10.1002/mabi.201000031
“Redox-active Polyimide/carbon Nanocomposite Electrodes for Reversible Charge Storage at Negative Potentials: Expanding the Functional Horizon of Polyimides”, J. Mater. Chem., 20, 5404-5410 (2010). DOI: 10.1039/C0JM00042F
“An Aqueous Electrolyte-type Rechargeable Device Utilizing a Hydrophilic Radical Polymer-cathode”, Macromol. Chem. Phys., 210, 1989-1995 (2009). DOI: 10.1002/macp.200900257
“Emerging N-Type Redox Active Radical Polymer for a Totally Organic Polymer-Based Rechargeable Battery”, Adv. Mater., 21, 1627-1630 (2009). DOI: 10.1002/adma.200803073
“An Ultrafast Chargeable Polymer Electrode Based on the Combination of Nitroxide Radical and Aqueous Electrolyte”, Chem. Commun., 836-838 (2009). DOI: 10.1039/B818087C
“Synthesis and Characterization of Radical-bearing Polyethers as an Electrode-active Material for Organic Secondary Batteries”, Macromolecules, 41, 6646-6652 (2008). DOI: 10.1021/ma702576z
(3) Organic-air Battery / 有機空気電池
“All-solid-state Rechargeable Air Batteries Using Dihydroxybenzoquinone and Its Polymer as the Negative Electrode”, Angew. Chem. Int. Ed., 62, e202304366 (2023). DOI: 10.1002/anie.202304366 (Open Access)
“Hydrophilic Anthraquinone-substituted Polymer: Its Environmentally Friendly Preparation and Efficient Charge/Proton-storage Capability for Polymer-air Secondary Batteries”, Macromolecules, 54, 4854-4859 (2021). DOI: 10.1021/acs.macromol.1c00865
“Charge- and Proton-Storage Capability of Naphthoquinone-Substituted Poly(allylamine) as Electrode-active Material for Polymer-Air Secondary Batteries”, ACS Appl. Energy Mater., 3, 12019-12024 (2020). DOI: 10.1021/acsaem.0c02178
“Conducting Redox Polymer as a Robust Organic Electrode-active Material in Acidic Aqueous Electrolyte towards Polymer-air Secondary Batteries”, ChemSusChem, 13, 2280-2285 (2020). DOI: 10.1002/cssc.202000627
“Poly(dihydroxybenzoquinone): Its High-density and Robust Charge Storage Capability in Rechargeable Acidic Polymer-air Batteries”, Chem. Commun., 56, 4055-4058 (2020). DOI: 10.1039/D0CC00660B
“High-density and Robust Charge Storage with Poly(anthraquinone-substituted norbornene) for Organic Electrode-active Materials in Polymer-air Secondary Batteries”, Macromolecules, 48, 2429-2434 (2015). DOI: 10.1021/ma502396r
“BODIPY-sensitized Photocharging of Anthraquinone-populated Polymer Layers for Organic Photorechargeable Air Battery”, J. Inorg. Organomet. Polym., 23, 243-250 (2013). DOI: 10.1007/s10904-012-9751-3
“Aqueous Electrochemistry of Poly(vinylanthraquinone) for Anode-active Materials in High-density and Rechargeable Polymer/Air Batteries”, J. Am. Chem. Soc., 133, 19839-19843 (2011). DOI: 10.1021/ja206961t
(4) Organic-zinc/manganese Battery / 有機亜鉛・マンガン電池
“Sandwich Configuration of Zinc Anode, Gel Electrolyte, and Radical Polymer Cathode for Fully Stretch-rechargeable Battery”, Adv. Sustain. Syst., 7, 2300080 (2023). DOI: 10.1002/adsu.202300080
“Conducting Redox Polymer as Organic Anode Material for Polymer-manganese Secondary Batteries”, ChemElectroChem, 7, 3336-3340 (2020). DOI: 10.1002/celc.202000711 (Open Access)
(5) Battery Catalysis / 電池触媒
“Accelerating Charge/discharge of Lithium Iron Phosphate by Charge Mediation Reaction of Poly(dimethylfluoflavin-substituted norbornene)”, Chem. Lett., 51, 1040-1043 (2022). DOI: 10.1246/cl.220345
“Ultrafast Charge/discharge by a 99.9% Conventional Lithium Iron Phosphate Electrode Containing 0.1% Redox-active Fluoflavin Polymer”, ACS Energy Lett., 5, 1712-1717 (2020). DOI: 10.1021/acsenergylett.0c00622
“Non-conjugated Redox-active Polymer Mediators for Rapid Electrocatalytic Charging of Lithium Metal Oxides”, ACS Appl. Energy Mater., 2, 6375-6382 (2019). DOI: 10.1021/acsaem.9b01007
