RIKEN
Papers
2026, 2025, 2024, 2023, 2022, 2021, ～2020
2026
“Elucidation of superionic conduction in K2NiF4-type Ba–Li oxyhydrides from a first-principles molecular dynamics study”, J. Haruyama, F. Takeiri, G. Kobayashi and O. Sugino, J. Mater. Chem. A, 14, 8332 (2026).
2025
“Palmierite-Type Oxyhydride Ba3V2H0.5O7.5 With Vanadium Charge Ordering”, H. Yaguchi, F. Takeiri, S. Komurasaki, T. Kobayashi, T. Saito, S. Hosokawa, K. Mori and G. Kobayashi, Small Structures, 7, e202500630 (2025).
“Mechanistic Insights into Hydride Incorporation in BaZr1–xInxO3-δ-Based Perovskite Oxyhydrides”, T. Takahashi, H. Toriumi, G. Kobayashi, T. Saito, K. Mori, S. Jeong, H. Habazaki and Y. Aoki, Chem. Mater., 37, 7834 (2025).
“Mechanochemical Synthesis of H– Materials: Hydrogen-Rich Perovskite Oxyhydrides with Lattice Strain as an Ammonia Synthesis Catalyst”, F. Takeiri, N. Oshime, S. Muhammady, T. Uchimura, H. Yaguchi, J. Haruyama, A. Machida, T. Watanuki, T. Saito, K. Mori, K. Ohwada, M. Kitano and G. Kobayashi, J. Am. Chem. Soc., 147, 24482 (2025).
“Ultra-Low Hysteresis, High-Toughness, Anti-Swelling Nanocomposite Hydrogel Derived from Dynamic Multiple Noncovalent Interactions for Wearable Strain Sensing and Underwater Gait Recognition”, J. Tang, Y. Chen, K. Li, Y. Bai, R. Guo, K. Fukuda, T. Someya, Y. Ito and M. Kawamoto, Chem. Eng. J., 516, 163845 (2025).
“Topochemical Transformation from Protonic to Hydride-ionic Phase in BaSn1-xInxO3-0.5x Perovskites", T. Takahashi, H. Toriumi, G. Kobayashi, T. Saito, K. Mori, H. Ariga-Miwa, T. Uruga, R. Maeda, S.W. Jeong, H. Habazaki and Y. Aoki, Chem. Mater., 37, 1111 (2025).
2024
“Li2NbHO2: a new transition-metal oxyhydride with rock-salt-type structure", F. Takeiri, K. Kusumoto, K. Kawai, H. Yaguchi, T. Saito, K. Mori, S. Hosokawa, M. Okubo and G. Kobayashi, Chem. Commun., 60, 14388 (2024).
“Selective Hydride Interstitials Induced in a High-Entropy Lanthanide Oxyhydride", Y. Vaishnav, R. K. Rai, W. Al Maksoud, F. Takeiri, S. Hayama, H. Yaguchi, S. Ould-Chikh, M. Toth, R. U. S. Bacha, B. Davaasuren, M. Avdeev, G. Kobayashi and Y. Kobayashi, Chem. Mater., 36, 10504 (2024).
“Controlling lithium cobalt oxide phase transition using molten fluoride salt for improved lithium-ion batteries", M. Mikami, J. Saito, T. Ochiai, M. Takahashi, T. Takahashi, Y. Momma, K. Kuriki, R. Wada, K. Yokomizo, G. Kobayashi, S. Komaba and S. Yamazaki, Commun. Mater., 5, 108 (2024).
2023
“High H– Conductivities along the ab-Planes of La2LiHO3 Epitaxial Thin Films", Y. Sasahara, T. Hirose, M. Yoshimoto, N. Matsui, S. Kobayashi, H. Ubukata, F. Takeiri, K. Suzuki, M. Hirayama, K. Nishio, R. Shimizu, R. Kanno, G. Kobayashi and T. Hitosugi, Cryst. Growth Des., 23, 7103 (2023).
“Electropositive Metal Doping into Lanthanum Hydride for H– Conducting Solid Electrolyte Use at Room Temperature", Y. Izumi, F. Takeiri, K. Okamoto, T. Saito, T. Kamiyama, A. Kuwabara and G. Kobayashi, Adv. Energy Mater., 13, 2301993 (2023).
“A new family of anti-perovskite oxyhydrides with tetrahedral GaO4 polyanions", N. I. P. Ayu, F. Takeiri, T. Ogawa, A. Kuwabara, M. Hagihala, T. Saito, T. Kamiyama and G. Kobayashi, Dalton Trans., 52, 15420 (2023).
“Magnetic Properties of Multifunctional 7LiFePO4 under Hydrostatic Pressure", U. Miniotaite, O. K. Forslund, E. Nocerino, F. Elson, R. Palm, N. Matsubara, Y. Ge, R. Khasanov, G. Kobayashi, Y. Sassa, J. Weissenrieder, V. Pomjakushin, D. Andreica, J. Sugiyama and M. Månsson, J. Phys.: Conf. Ser., 2462, 012049 (2023).
“Impact of Na Concentration on the Phase Transition Behavior and H– Conductivities in the Ba-Li-H-O Oxyhydride System", K. Okamoto, F. Takeiri, Y. Imai, M. Yonemura, T. Saito, K. Ikeda, T. Otomo, T. Kamiyama and G. Kobayashi, Adv. Sci., 10, 2203541 (2023).
2022
“Stabilization of a high H–- conducting phase via K doping of Ba-Li oxyhydride", K. Okamoto, F. Takeiri, Y. Imai, M. Yonemura, T. Saito, K. Ikeda, T. Otomo, T. Kamiyama and G. Kobayashi, J. Mater. Chem. A., 10, 23023-27 (2022).
“Barium Indate–Zirconate Perovskite Oxyhydride with Enhanced Hydride Ion/Electron Mixed Conductivity", H. Toriumi, G. Kobayashi, T. Saito, T. Kamiyama, T. Sakai, T. Nomura, S. Kitano, H. Habazaki and Y. Aoki, Chem. Mater., 34(16), 7389-401 (2022).
“Trihalide Mixing by Size-Flexible H– Ions in Layered Ba2H3 (Cl, Br, I)", H. Ubukata, F. Takeiri, C. Tassel, S. Kobayashi, S. Kawaguchi, T. Saito, T. Kamiyama, S. Kobayashi, G. Kobayashi and H. Kageyama, Chem. Mater., 34(12), 5654-62 (2022).
“Sequential Pressure-Induced B1–B2 Transitions in the Anion-Ordered Oxyhydride Ba2YHO3", H. W. T. Morgan, T. Yamamoto, T. Nishikubo, T. Ohmi, T. Koike, Y. Sakai, M. Azuma, H. Ishii, G. Kobayashi and J. E. McGrady, Inorg. Chem., 61(18), 7043-50 (2022).
“Hydride-Ion-Conducting K2NiF4-Type Ba-Li Oxyhydride Solid Electrolyte”, F. Takeiri, A. Watanabe, K. Okamoto, D. Bresser, S. Lyonnard, B. Frick, A. Ali, Y. Imai, M. Nishikawa, M. Yonemura, T. Saito, K. Ikeda, T. Otomo, T. Kamiyama, R. Kanno and G. Kobayashi, Nat. Mater., 21, 325–330 (2022).
“Resent Progress on Mixed-Anion Materials for Energy Applications”, K. Maeda, F. Takeiri, G. Kobayashi, S. Matsuishi, H. Ogino, S. Ida, T. Mori, Y. Uchimoto, S. Tanabe, T. Hasegawa, N. Imanaka and H. Kageyama, Bull. Chem. Soc. Jpn., 95, 26-37 (2022).
2021
“Effects of Mechanical Grinding on the Phase Behavior and Anhydrous Proton Conductivity of Imidazolium Hydrogen Succinate”, S. Dekura, Y. Sunairi, K. Okamoto, F. Takeiri, G. Kobayashi, Y. Hori, Y. Shigeta and H. Mori, Solid State Ionics, 372, 115775 (2021).
“Direct Synthesis of Barium Titanium Oxyhydride for Use as a Hydrogen Permeable Electrode”, T. Uchimura, F. Takeiri, K. Okamoto, T. Saito, T. Kamiyama and G. Kobayashi, J. Mater. Chem. A, 9, 20371-20374 (2021).
～2020
“Anion Ordering Enables Fast H– Conduction at Low Temperatures”, H. Ubukata, F. Takeiri, K. Shitara, C. Tassel, T. Saito, T. Kamiyama, T. Broux, A. Kuwabara, G. Kobayashi and H. Kageyama, Sci. Adv., 7, eabf7883 (2021).
“The Effect of Cation Size on Hydride-Ion Conduction in LnSrLiH2O2 (Ln = La, Pr, Nd, Sm, Gd) Oxyhydrides”, N. Matsui, Y. Hinuma, Y. Iwasaki, K. Suzuki, J. Guangzhoung, H. Nawaz, Y. Imai, M. Yonemura, M. Hirayama, G. Kobayashi and R. Kanno, J. Mater. Chem. A, 8, 24685-24694 (2020).
“Synthesis and H– Conductivity of a New Oxyhydride Ba2YHO3 with Anion-Ordered Rock-Salt Layers”, H. Nawaz, F. Takeiri, A. Kuwabara, M. Yonemura and G. Kobayashi, Chem. Commun., 56, 10373-10376 (2020).
“Luminescent Ionic Liquid Formed from a Melted Rhenium(V) Cluster”, J. Yanagisawa, T. Hiraoka, F. Kobayashi, D. Saito, M. Yoshida, M. Kato, F. Takeiri, G. Kobayashi, M. Ohba, L. F. Lindoy, R. Ohtani and S. Hayami, Chem. Commun., 56, 7957-7960 (2020).
“Arrangement of Water Molecules and High Proton Conductivity of Tunnel Structure Phosphates, KMg1-xH2x(PO3)3·yH2O”, Y. Matsuda, K. Funakoshi, R. Sebe, G. Kobayashi, M. Yonemura, N. Imanishi, D. Mori and S. Higashimoto, RSC Adv., 13, 7803-7811 (2020).
“Hydride Conductivity in an Anion-Ordered Fluorite Structure LnHO with an Enlarged Bottleneck”, H. Ubukata, T. Broux, F. Takeiri, K. Shitara, H. Yamashita, A. Kuwabara, G. Kobayashi and H. Kageyama, Chem. Mater., 31, 7360-7366 (2019).
“High-Pressure Polymorphs of LaHO with Anion Coordination Reversal”, T. Broux, H. Ubukata, C. J. Pickard, F. Takeiri, G. Kobayashi, S. Kawaguchi, M. Yonemura, Y. Goto, C. Tassel and H. Kageyama, J. Am. Chem. Soc., 141, 8717-8720 (2019).
“Ba2ScHO3: H– Conductive Layered Oxyhydride with H– Site Selectivity”, F. Takeiri, A. Watanabe, A. Kuwabara, H. Nawaz, N. I. P. Ayu, M. Yonemura, R. Kanno and G. Kobayashi, Inorg. Chem., 58, 4431-4436 (2019).
“Ambient Pressure Synthesis of La2LiHO3 as a Solid Electrolyte for a Hydrogen Electrochemical Cell”, N. Matsui, G. Kobayashi, K. Suzuki, A. Watanabe, A. Kubota, Y. Iwasaki, M. Yonemura, M. Hirayama and R. Kanno, J. Am. Ceram. Soc., 102, 3228-3235 (2019).
“Synthesis, Crystal Structure, and Ionic Conductivity of Hydride Ion-Conducting Ln2LiHO3 (Ln = La, Pr, Nd) Oxyhydrides”, Y. Iwasaki, N. Matsui, K. Suzuki, Y. Hinuma, M. Yonemura, G. Kobayashi, M. Hirayama, I. Tanaka and R. Kanno, J. Mater. Chem. A, 6, 23457-23463 (2018).
“Detecting Dynamics Responses of Materials and Devices Under an Alternating Electric Potential by Phase-Locked Transmission Electron Microscopy”, K. Soma, S. Konings, R. Aso, N. Kamiuchi, G. Kobayashi, H. Yoshida and S. Takeda, Ultramicroscopy, 181, 27-41 (2017).
“Ambient Pressure Synthesis and H– Conductivity of LaSrLiH2O2”, A. Watanabe, G. Kobayashi, N. Matsui, M. Yonemura, A. Kubota, K. Suzuki, M. Hirayama and R. Kanno, Electrochemistry, 85(2), 88-92 (2017).
“Pure H– Conduction in Oxyhydrides”, G. Kobayashi, Y. Hinuma, S. Matsuoka, A. Watanabe, M. Iqbal, M. Hirayama, M. Yonemura, T. Kamiyama, I. Tanaka and R. Kanno, Science, 351, 1314-1317 (2016).
“Improving Cycling Performance of Li-Rich Layered Cathode Materials Through Combination of Al2O3-Bbased Surface Modification and Stepwise Precycling”, G. Kobayashi, Y. Irii, F. Matsumoto, A. Ito, Y. Ohsawa, S. Yamamoto, Y. Cui, J.-Y. Son and Y. Sato, J. Power Sources, 303, 250-256 (2016).
“Lithium Ion Conduction in Doped LaLiO2 System”, M. Iqbal, K. Suzuki, G. Kobayashi, G. Zhao, M. Hirayama and R. Kanno, Solid State Ion., 285, 33-37 (2016).
“In Situ X-Ray Visualization of the Lithiation Process in Porous Graphite Electrode in an Operating Li-Ion Cell”, S. Tsushima, W. Hung, P. Deevanhxay, G. Kobayashi, R. Kanno and S. Hirai, ChemElectroChem., 2(10), 1535-1540 (2015).
“High-Rate Performance of Bacterial Iron-Oxide Electrode Material for Lithium-Ion Battery”, R. Sakuma, H. Hashimoto, G. Kobayashi, T. Fujii, M. Nakanishi, R. Kanno, M. Takano and J. Takada, Mater. Lett., 139, 414-417 (2015).
“Variation of Local Magnetic Environments in Olivine-Type Compounds: Na0.7FePO4 and FePO4”, J. Sugiyama, H. Nozaki, M. Harada, Y. Higuchi, J. H. Brewer, E. J. Ansaldo, G. Kobayashi and R. Kanno, Phys. Rev. B, 90, 014426/1-014426/10 (2014).
“High-Pressure Synthesis and Electrochemical Properties of Lithium Transition Metal Oxides with Layered Rock-Salt Structure”, C. Hansen, K. Kubota, G. Kobayashi, M. Hirayama and R. Kanno, J. Power Sources, 252, 1-7 (2014).
“Bacterial Nanometric Amorphous Fe-Based Oxide: A Potential Lithium-Ion Battery Anode Material”, H. Hashimoto, G. Kobayashi, R. Sakuma, T. Fujii, N. Hayashi, T. Suzuki, R. Kanno, M. Takano and J. Takada, ACS Appl. Mater. Interfaces, 6, 5374-5378 (2014).
“Stable Charge/Discharge Cycle Performance of a LiFePO4 Cathode Prepared with a Carboxymethyl Cellulose Binder”, T. Wakao, T. Gunji, A. J. Jeevagan, Y. Mochizuki, S. Kaneko, K. Baba, M. Watanabe, Y. Kanda, K. Murakami, M. Omura, G. Kobayashi and F. Matsumoto, ECS Trans., 58, 19-25 (2014).
“Electrocatalytic Oxygen Reduction and Water-Oxidation on Transition Metal Ion-Doped MnO2, RuO2 and IrO2 in Alkaline Aqueous Solutions”, A. J. Jeevagan, Y. Suzuki, T. Gunji, G. Saravanan, Y. Irii, T. Tsuda, T. Onobuchi, S. Kaneko, G. Kobayashi and F. Matsumoto, ECS Trans., 58, 9-18 (2014).
“Two-Step Microwave Synthesis of Highly Dispersed Ordered Intermetallic PtPb Nanoparticles on Carbon Black”, A. J. Jeevagan, T. Gunji, N. Sawano, G. Saravanan, T. Kojima, S. Kaneko, G. Kobayashi and F. Matsumoto, ECS Trans., 58, 25-31 (2014).
“Structural, Magnetic, and Diffusive Nature of Olivine-Type NaxFePO4”, J. Sugiyama, H. Nozaki, I. Umegaki, M. Harada, Y. Higuchi, E. J. Ansaldo, J. H. Brewer, Y. Miyake, G. Kobayashi and R. Kanno, J. Phys. Conf. Ser., 551, 012012 (2014).
“Long-Term, Stable, and Improved Oxygen-Reduction Performance of Titania-Supported PtPb Nanoparticles”, T. Gunji, G. Saravanan, T. Tanabe, T. Tsuda, M. Miyauchi, G. Kobayashi, H, Abe and F. Matsumoto, Catal. Sci. Technol., 4, 1436-1445 (2014).
“Synthesis, Structure and Electrochemical Properties of Layered La2Li2x(CO3)1-xO2+2x”, M. Iqbal, G. Kobayashi, M. Hirayama and R. Kanno, J. Solid State Chem., 206, 14-19 (2013).
“Leaching Tolerance of Anodic Pt-Based Intermetallic Catalysts for Formic Acid Oxidation”, G. Saravanan, K. Namba, G. Kobayashi and F. Matsumoto, Electrochim. Acta, 99, 15-21 (2013).
“Application of Ordered Intermetallic Phases to Electrocatalysis”, F. Matsumoto, G. Saravanan and G. Kobayashi, ECS Trans., 50, 3-8 (2013).
“Magnetic and Diffusive Nature of LiFePO4”, J. Sugiyama, H. Nozaki, K. Kamazawa, O. Ofer, M. Mansson, E. J. Ansaldo, J. H. Brewer, K. H. Chow, I. Watanabe, Y. Ikedo, Y. Miyake, G. Kobayashi and R. Kanno, Phys. Procedia, 30, 190-193 (2012).
“The Magnetic Phase of Lithium Transition Metal Phosphates LiMPO4 (M = Mn, Co, Ni) Detected by µ+ SR”, O. Ofer, J. Sugiyama, J. H. Brewer, M. Mansson, K. Prsa, E. J. Ansaldo, G. Kobayashi and R. Kanno, Phys. Procedia, 30, 160-163 (2012).
“Diffusive Behavior in LiMPO4 with M = Fe, Co, Ni Probed by Muon-Spin Relaxation”, J. Sugiyama, H. Nozaki, M. Harada, K. Kamazawa, Y. Ikedo, Y. Miyake, O. Ofer, M. Mansson, E. J. Ansaldo, K. H. Chow, G. Kobayashi and R. Kanno, Phys. Rev. B, 85, 054111 (2012).
“Activation of a Li-Rich Solid-Solution Layered Li[Ni0.18Li0.20Co0.03Mn0.58]O2 Cathode and Retention of High Capacities via an Electrochemical Pretreatment with a Low Discharge Voltage Limit”, M. Abe, F. Matsumoto, M. Saito, H. Yamamura, G. Kobayashi, A. Ito, T. Sanada, M. Hatano, Y. Ohsawa and Y. Sato, Chem. Lett., 41 418-419 (2012).
“Relationship Between Electrochemical Pre-Treatment and Cycle Performance of a Li-Rich Solid-Solution Layered Li1-a[Ni0.18Li0.20+αCo0.03Mn0.58]O2 Cathode for Li-Ion Secondary Batteries”, A. Watanabe, F. Matsumoto, M. Fukunishi, G. Kobayashi, A. Ito, M. Hatano, Y. Ohsawa and Y. Sato, Electrochemistry, 80, 561-565 (2012).
“Magnetic and Diffusive Nature of LiFePO4 Investigated by Muon Spin Rotation and Relaxation”, J. Sugiyama, H. Nozaki, M. Harada, K. Kamazawa, O. Ofer, M. Månsson, J. H. Brewer, E. J. Ansaldo, K. H. Chow, Y. Ikedo, Y. Miyake, K. Ohishi, I. Watanabe, G. Kobayashi and R. Kanno, Phys. Rev. B, 84, 054430 (2011).
“Structural and Magnetic Properties of Lix(MnyFe1-y)PO4 Electrode Materials for Li-Ion Batteries”, M. Kope¢. A. Yamada, G. Kobayashi, S. Nishimura, R. Kanno, A. Mauger, F. Gendron and C.M. Jullien, J. Power Sources, 189(2), 1154-1163 (2009).
“Shift of Redox Potential and Kinetics in Lix(MnyFe1-y)PO4”, G. Kobayashi, A. Yamada, S. Nishimura, R. Kanno, Y. Kobayashi, S. Seki, Y. Ohno and H. Miyashiro, J. Power Sources, 189(1), 397-401 (2009).
“Isolation of Solid Solution Phases in Size-Controlled LixFePO4 at Room Temperature”, G. Kobayashi, S. Nishimura, M.-S. Park, R. Kanno, M. Yashima, T. Ida and A. Yamada, Adv. Funct. Mater., 19(3), 395-403 (2009).
“Experimental Visualization of Lithium Diffusion in LixFePO4”, S. Nishimura, G. Kobayashi, K. Ohoyama, R. Kanno, M. Yashima and A. Yamada, Nat. Mater., 7, 707-711 (2008).
“Air Exposure Effect on LiFePO4”, J. F. Martin, A. Yamada, G. Kobayashi, S. Nishimura, R. Kanno, D. Guyomard and N. Dupré, Electrochem. Solid-State Lett., 11, A12-A16 (2008).
