研究者詳細 - 長谷川　丈二

論文 - 長谷川　丈二

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Hydrogarnet-Derived Porous Polyhedral Particles of SrFeO3-δ Perovskite 査読有り

Hikaru Otaguro, Tomoki Takeno, Ryosuke Sugimoto, Saburo Hosokawa, Hirofumi Akamatsu, Takahisa Yamamoto, Kazuki Nakanishi, Katsuro Hayashi, George Hasegawa

Chemistry of Materials 35 巻 ( 16 ) 頁： 6423 - 6436 2023年8月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Chemistry of Materials

Introduction of open mesoporosity into microparticles with a robust morphology provides a high active surface area together with good thermal stability and shows benefit in various applications at high temperatures. Recently, nonstoichiometric Sr-Fe perovskites with an oxygen release/absorption capability have attracted interests as an oxidation catalyst operated at elevated temperatures. Here, we demonstrate the topotactic synthesis approach to fabricate mesoporous microparticles of SrFeO3−δ with monodispersibility as well as rhombic dodecahedral morphology from the correspondent hydrogarnet precursor (Sr3Fe2(OH)12) prepared by the hydrothermal reaction. Relationship between synthetic conditions and the formed crystal morphology has been systematically explored, which discloses that the crystallization of hydrogarnet can take place at as low as 40 °C. On heating, the dehydration of Sr3Fe2(OH)12 gives rise to phase separation into Sr(OH)2 and SrFeO3−δ via a transient phase of “oxyhydrogarnet”. Selective removal of the Sr(OH)2-derived phase leaves three-dimensionally interconnected mesopores in individual polyhedral microparticles. Meanwhile, further increase of the heat-treatment temperature sets off the reaction between the two separated phases, ending up in nonporous polyhedral particles composed of Ruddlesden-Popper-type layered perovskite (Sr3Fe2O7−δ) at 1200 °C. The mesoporous SrFeO3−δ polyhedral microparticles exhibit an enhanced catalytic performance of CO oxidation superior to the nonporous counterparts, which is associated with the stimulated oxygen release capability owing to mesoporosity rather than the oxygen uptake rate.

DOI： 10.1021/acs.chemmater.3c01150

Scopus

NASICON-Based All-Solid-State Na-ion Batteries: A Perspective on Manufacturing via Tape-Casting Process 招待有り査読有り

George Hasegawa, Katsuro Hayashi

APL Energy 1 巻 ( 2 ) 頁： 020902 2023年7月

Enhanced Electrochemical and Transportation Properties in a NASICON-Type Na3Zr2(SiO4)2(PO4)–Na3Ti2(PO4)3 Junction Prepared by Spin Coating and Glass-Ceramic Processes 査読有り

Shufan Jia, Saneyuki Ohno, Jian Wang, George Hasegawa, Hirofumi Akamatsu, Katsuro Hayashi

ACS Applied Energy Materials 6 巻 ( 1 ) 頁： 317 - 325 2022年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS Applied Energy Materials

Impacts of an electrode active material with 1 μm scale thickness on the performance of an oxide-based all-solid-state battery (ASSB) have been investigated by metallic Na | Na3Zr2(SiO4)2(PO4) (NZSP) | Na3Ti2(PO4)3 (NTP) cells. Dense crystalline NTP layer is formed on NZSP ceramic electrolyte using spin coating of glass powder suspension and subsequent crystallization (glass-ceramic process). A sample with 0.6 μm thick NTP layer exhibits 0.1 C charge/discharge cycling with very small polarization (<0.03 V), and its initial capacity of ∼60 mA h g-1 is retained >80% after 60 cycles. Fast cathode kinetics also realized the 0.1 C capacity at −20 °C to be ∼80% retention. Furthermore, a facile control over the thickness of cathode films without any conductive additives in the 1 μm range demonstrated in this work enables the assessment of cathode kinetics. Electrochemical impedance spectroscopy revealed that Warburg resistance originates from an ambipolar diffusion of an electron and Na+ ion. The methodology presented here paves a way for rapid examinations of electrode material compatibility and electrode design for next-generation oxide-based ASSBs.

DOI： 10.1021/acsaem.2c03022

Web of Science

Scopus

Topochemical Synthesis of LiCoF3 with a High-Temperature LiNbO3-Type Structure 査読有り

Yumi Matsuo, Yuko Matsukawa, Masahiro Kitakado, George Hasegawa, Suguru Yoshida, Ryoto Kubonaka, Yuya Yoshida, Tatsushi Kawasaki, Eiichi Kobayashi, Chikako Moriyoshi, Saneyuki Ohno, Koji Fujita, Katsuro Hayashi, Hirofumi Akamatsu

Inorganic Chemistry 61 巻 ( 30 ) 頁： 11746 - 11756 2022年8月

Free-standing and binder-free porous monolithic electrodes prepared via sol-gel processes 査読有り

George Hasegawa

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 103 巻 ( 2 ) 頁： 637 - 679 2022年8月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Sol-Gel Science and Technology

Electrochemical devices that harvest or store electrical energy are indispensable to our daily life and are currently of growing importance in the future prosperity of the world economy. The sol–gel technology has contributed substantially to the development of electrode materials and electrocatalysts, particularly in terms of the synthesis of nano-sized and/or nanostructured particles. As with the other application fields, nanomaterials with enriched active surface sites can enhance electrode performance, and hence, have been substituted for the classical low-surface-area electrodes like rods and plates. However, the powdery nanomaterials need to be fixed on an electrode substrate in a mixture with binders and conductive agents, which imposes several drawbacks especially in fundamental research. In this context, free-standing and binder-free monolithic electrodes bearing rationally designed nanostructures have emerged as advanced electrode materials based on the concept of incorporating the nanomaterials into the classical bulky electrodes. This review focuses on the recent progress in porous monolithic electrodes with special concern for those with three-dimensionally interconnected porous structures prepared via the sol–gel processes accompanied by phase separation. In addition to the synthesis and pore control for various electrode materials, the insights garnered from the electrochemical investigations on the porous monolithic electrodes are overviewed. [Figure not available: see fulltext.].

DOI： 10.1007/s10971-022-05862-5

Web of Science

Scopus

Mechanical and thermal properties of porous polyimide monoliths crosslinked with aromatic and aliphatic triamines 査読有り

Mitsuhiro Ishida, Yutaro Sashiyama, Hirofumi Akamatsu, Katsuro Hayashi, Kazuki Nakanishi, George Hasegawa

Journal of Sol-Gel Science and Technology 104 巻 ( 3 ) 頁： 526 - 536 2022年5月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Sol-Gel Science and Technology

Thermal insulating materials are of importance for efficient and effective use of heat energy. Porous organic foams are widely employed for this purpose owing to their low thermal conductivity and mass productivity at low cost. However, the poor thermal stability of organic polymers limits their availability within a low temperature range (typically, < 150 °C). In this paper, we demonstrate the one-pot sol–gel synthesis of porous poly(amic acid) (PAA) xerogels and their conversion to porous polyimide (PI) monoliths by thermal imidization. The PAA networks crosslinked with either aromatic or aliphatic triamine and the bicontinuous porous morphology tailored via spinodal decomposition allow the evaporative drying at ambient pressure to obtain low-density PAA xerogels without significant shrinkage. The aromatic crosslinker yields the porous PI monoliths with higher porosity and flexible feature as compared with those prepared with the aliphatic triamine. On the other hand, the porous PI monolith based on the aliphatic crosslinker possesses slightly higher thermal stability owing to the stiffer mechanical property. The durability test results verify the porous PI thermal insulators are available in air at up to ~450 °C for a short period and up to ~350 °C for a long term. [Figure not available: see fulltext.]

DOI： 10.1007/s10971-022-05843-8

Web of Science

Scopus

その他リンク： https://link.springer.com/article/10.1007/s10971-022-05843-8/fulltext.html

Glass-ceramic route to NASICON-type Na Ti2(PO4)3 electrodes for Na-ion batteries 査読有り

Shufan Jia, Hirofumi Akamatsu, George Hasegawa, Saneyuki Ohno, Katsuro Hayashi

Ceramics International 48 巻 ( 17 ) 頁： 24758 - 24764 2022年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Ceramics International

Glass-ceramic processes to prepare NASICON-type NaxTi2(PO4)3, which is an anode candidate for sodium-ion batteries, from 30Na2O–40TiO2–30P2O5 glass have been investigated with varied atmospheric conditions. By annealing in the inert (N2) atmosphere, the glass started crystalizing into NASICON-type NaTi2(PO4)3 with rhombohedral symmetry at ∼600 °C followed by crystallization of other phases to be multiphase mixtures at higher temperatures. In contrast, in the reducing (5% H2/Ar) atmosphere, NASICON-type Na3Ti2(PO4)3 with triclinic symmetry is crystallized at >∼800 °C. The formation of Na3Ti2(PO4)3 is associated with a loss of excess oxygens in the initial glass composition and a reduction of Ti from Ti4+ to Ti3+. The reduction process upon the glass-to-ceramic conversion was traced by in-situ observation during the thermogravimetric analysis. It is also revealed that the electrochemical Na + -storage capabilities of the glass-ceramic electrodes are correlated with the Na-ion occupancy between these two phases, and their phase fractions affect the charge-discharge properties of Na-ion cells. Finer glass-ceramic powders could improve the electrochemical properties and achieve almost 80% of its theoretical capacity.

DOI： 10.1016/j.ceramint.2022.05.125

Web of Science

Scopus

Porous Polymer-Derived Ceramics: Flexible Morphological and Compositional Controls through Sol-Gel Chemistry 招待有り査読有り

George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi

JOURNAL OF THE AMERICAN CERAMIC SOCIETY 105 巻 ( 1 ) 頁： 5 - 34 2022年1月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of the American Ceramic Society

Porous nonoxide ceramics have exhibited impressive progress in terms of synthesis and applications over the past few decades because of their unique characteristics distinguished from the oxide counterparts. From the synthetic aspect, the preceramic polymer route, where nonoxide ceramics such as carbides and nitrides are produced from molecular precursors, offers exceptional opportunities to elaborate and control the material shape as well as the micro- and nanostructures in concert with various techniques. This review presents monolithic ceramic materials based on various reduced phases bearing hierarchical porosity with a focus on those obtained from macroporous preceramic monoliths prepared via the one-pot sol–gel process accompanied by spinodal decomposition. Here, we highlight two classes of preceramic inorganic–organic hybrid gels: organometallic crosslinked polymers based on poly(silsesquioxane)s and nonorganometallic hybrid networks related to Ti without Ti–C bonds. The polymer-to-ceramic conversion processes are discussed with concern for the crystal transition behaviors and the variation of pore properties in different length scales upon heating. In addition, although out of the preceramic polymer category, some examples of inorganic–organic nanocomposite gels with a carbonizable polymer and/or urea for yielding porous metal carbides and nitrides in a monolithic form are introduced as well, which provides extended versatility toward a variety of transition metal systems.

DOI： 10.1111/jace.18130

Web of Science

Scopus

Sodium ion conduction in sodium lanthanum zirconate ceramics prepared by spark plasma sintering

Toyomura Naoto, Hasegawa George, Nishimi Kazuma, Inada Miki, Enomoto Naoya, Hayashi Katsuro

SCRIPTA MATERIALIA 200 巻 2021年7月

Preparation of hierarchically porous spinel CoMn2O4 monoliths via sol-gel process accompanied by phase separation

Lu Xuanming, Kanamori Kazuyoshi, Hasegawa George, Nakanishi Kazuki

JOURNAL OF THE AMERICAN CERAMIC SOCIETY 104 巻 ( 6 ) 頁： 2449 - 2459 2021年6月

Sn-Based Perovskite with a Wide Visible-Light Absorption Band Assisted by Hydride Doping

Nakamura Masashi, Watanabe Hiroshi, Akamatsu Hirofumi, Fujii Kotaro, Yashima Masatomo, Hasegawa George, Inada Miki, Hayashi Katsuro, Maeda Kazuhiko

CHEMISTRY OF MATERIALS 33 巻 ( 10 ) 頁： 3631 - 3638 2021年5月

Porous reduced ceramic monoliths derived from silicon- and titanium-based preceramic polymer gels 招待有り査読有り

George Hasegawa

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 129 巻 ( 5 ) 頁： 227 - 233 2021年5月

担当区分：筆頭著者,　責任著者記述言語：英語出版者・発行元：Journal of the Ceramic Society of Japan

Preceramic polymer routes, which produce ceramic products called polymer-derived ceramics (PDCs) from molecular precursors, have been developed as a powerful tool to synthesize reduced ceramics in different morphologies (fibers, coatings and monoliths) for over half a century. In recent years, pore control of porous ceramic monoliths has attracted attention for improving their functionalities, which has driven the preceramic polymer routes to be integrated with other synthetic techniques for porous materials such as templating, foaming, emulsion and phase separation. This article briefly overviews porous PDC monoliths with a special emphasis on those derived from porous preceramic polymer gels which are prepared via the solgel process accompanied by spinodal decomposition. Ceramization behaviors of Si- and Ti-based preceramic polymers are highlighted in terms of crystal transition and variation of pore properties in different length scales.

DOI： 10.2109/jcersj2.21024

Web of Science

Scopus

Designing hierarchical porosity in tin oxide monoliths and their application as a solid acid catalyst 査読有り

Yoshinao Suzuki, George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi

New Journal of Chemistry 2021年

Ferroelectricity of Dion–Jacobson layered perovskites CsNdNb2O7 and RbNdNb2O7 査読有り

Sota Asaki, Hirofumi Akamatsu, George Hasegawa, Tomohiro Abe, Yuki Nakahira, Suguru Yoshida, Chikako Moriyoshi, Katsuro Hayashi

Japanese Journal of Applied Physics 59 巻 ( SP ) 頁： SPPC04 2020年11月

Hierarchically Porous Monoliths Prepared via Sol–Gel Process Accompanied by Spinodal Decomposition 招待有り査読有り

Xuanming Lu, George Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi

Journal of Sol-Gel Science & Technology 95 巻頁： 530 - 550 2020年9月

Gas sorption porosimetry for the evaluation of hard carbons as anodes for Li- and Na-ion batteries

Matsukawa Yuko, Linsenmann Fabian, Plass Maximilian A., Hasegawa George, Hayashi Katsuro, Fellinger Tim-Patrick

BEILSTEIN JOURNAL OF NANOTECHNOLOGY 11 巻頁： 1217-1229 2020年8月

Reversible Electrochemical Insertion/Extraction of Magnesium Ion into/from Robust NASICON-Type Crystal Lattice in a Mg(BF4)(2)-Based Electrolyte

Hasegawa George, Akiyama Yuto, Tanaka Moeko, Ishikawa Ryo, Akamatsu Hirofumi, Ikuhara Yuichi, Hayashi Katsuro

ACS APPLIED ENERGY MATERIALS 3 巻 ( 7 ) 頁： 6824-6833 2020年7月

Variation of meso- and macroporous morphologies in resorcinol-formaldehyde (RF) gels tailored via a sol-gel process combined with soft-templating and phase separation

Hasegawa George, Yano Takaya, Akamatsu Hirofumi, Hayashi Katsuro, Nakanishi Kazuki

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 2020年2月

Thermogravimetric Evolved Gas Analysis and Microscopic Elemental Mapping of the Solid Electrolyte Interphase on Silicon Incorporated in Free-Standing Porous Carbon Electrodes

Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Hayashi Katsuro

LANGMUIR 35 巻 ( 39 ) 頁： 12680-12688 2019年10月

A highly conductive Na3V2(PO4)(3) ceramic sheet prepared by tape-casting method

Wang He, Hasegawa George, Akiyama Yuto, Yamamoto Takahisa, Inoishi Atsushi, Akamatsu Hirofumi, Inada Miki, Ishihara Tatsumi, Hayashi Katsuro

ELECTROCHIMICA ACTA 305 巻頁： 197-203 2019年5月

Characterization of an AX Compound Derived from Ti2SC MAX Phase

Hasegawa George, Kawahara Kei, Shima Kazunari, Inada Miki, Enomoto Naoya, Hayashi Katsuro

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY ( 17 ) 頁： 2312 - 2317 2019年5月

Insights into Sodium Ion Transfer at the Na/NASICON Interface Improved by Uniaxial Compression

Uchida Yasuhiro, Hasegawa George, Shima Kazunari, Inada Miki, Enomoto Naoya, Akamatsu Hirofumi, Hayashi Katsuro

ACS APPLIED ENERGY MATERIALS 2 巻 ( 4 ) 頁： 2913 - 2920 2019年4月

Sodium titanium oxide bronze nanoparticles synthesized via concurrent reduction and Na+-doping into TiO2(B).

Hasegawa G, Tanaka M, Vequizo JJM, Yamakata A, Hojo H, Kobayashi M, Kakihana M, Inada M, Akamatsu H, Hayashi K

Nanoscale 11 巻 ( 3 ) 頁： 1442-1450 2019年1月

Low temperature-densified NASICON-based ceramics promoted by Na2O-Nb2O5-P2O5 glass additive and spark plasma sintering

Wang He, Okubo Keisuke, Inada Miki, Hasegawa George, Enomoto Naoya, Hayashi Katsuro

SOLID STATE IONICS 322 巻頁： 54 - 60 2018年9月

On-line Redox Derivatization Liquid Chromatography Using a Carbon Monolithic Column

Miyashita Ken, Tanaka Ryo, Hasegawa George, Nakanishi Kazuki, Morioka Kazuhiro, Zeng Hulie, Kato Shungo, Uchiyama Katsumi, Saitoh Kazunori, Shibukawa Masami, Nakajima Hizuru

BUNSEKI KAGAKU 67 巻 ( 8 ) 頁： 469 - 478 2018年8月

Topotactic Synthesis of Mesoporous 12CaO center dot 7Al(2)O(3) Mesocrystalline Microcubes toward Catalytic Ammonia Synthesis

Hasegawa George, Moriya Shizuka, Inada Mild, Kitano Masaaki, Okunaka Masaaki, Yamamoto Takahisa, Matsukawa Yuko, Nishimi Kazuma, Shima Kazunari, Enomoto Naoya, Matsuishi Satoru, Hosono Hideo, Hayashi Katsuro

CHEMISTRY OF MATERIALS 30 巻 ( 14 ) 頁： 4498-4502 2018年7月

A dense NASICON sheet prepared by tape-casting and low temperature sintering

Okubo Keisuke, Wang He, Hayashi Katsuro, Inada Miki, Enomoto Naoya, Hasegawa George, Osawa Takashi, Takamura Hitoshi

ELECTROCHIMICA ACTA 278 巻頁： 176 - 181 2018年7月

Comprehensive studies on phosphoric acid treatment of porous titania toward titanium phosphate and pyrophosphate monoliths with pore hierarchy and a nanostructured pore surface

Zhu Yang, Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

INORGANIC CHEMISTRY FRONTIERS 5 巻 ( 6 ) 頁： 1397 - 1404 2018年6月

Nanostructured titanium phosphates prepared via hydrothermal reaction and their electrochemical Li- and Na-ion intercalation properties

Zhu Y., Hasegawa G., Kanamori K., Kiyomura T., Kurata H., Hayashi K., Nakanishi K.

CRYSTENGCOMM 19 巻 ( 31 ) 頁： 4551 - 4560 2017年8月

Highly Flexible Hybrid Polymer Aerogels and Xerogels Based on Resorcinol-Formaldehyde with Enhanced Elastic Stiffness and Recoverability: Insights into the Origin of Their Mechanical Properties

Hasegawa George, Shimizu Taiyo, Kanamori Kazuyoshi, Maeno Ayaka, Kaji Hironori, Nakanishi Kazuki

CHEMISTRY OF MATERIALS 29 巻 ( 5 ) 頁： 2122 - 2134 2017年3月

Amine/Hydrido Bifunctional Nanoporous Silica with Small Metal Nanoparticles Made Onsite: Efficient Dehydrogenation Catalyst.

Zhu Y, Nakanishi T, Kanamori K, Nakanishi K, Ichii S, Iwaida K, Masui Y, Kamei T, Shimada T, Kumamoto A, Ikuhara YH, Jeon M, Hasegawa G, Tafu M, Yoon CW, Asefa T

ACS applied materials & interfaces 9 巻 ( 1 ) 頁： 36-41 2017年1月

Studies on electrochemical sodium storage into hard carbons with binder-free monolithic electrodes

Hasegawa George, Kanamori Kazuyoshi, Kannari Naokatsu, Ozaki Jun-ichi, Nakanishi Kazuki, Abe Takeshi

JOURNAL OF POWER SOURCES 318 巻頁： 41 - 48 2016年6月

Hierarchically Porous Carbon Monoliths Comprising Ordered Mesoporous Nanorod Assemblies for High-Voltage Aqueous Supercapacitors

Hasegawa George, Kanamori Kazuyoshi, Kiyomura Tsutomu, Kurata Hiroki, Abe Takeshi, Nakanishi Kazuki

CHEMISTRY OF MATERIALS 28 巻 ( 11 ) 頁： 3944 - 3950 2016年6月

Infiltrated porous oxide monoliths as high lithium transference number electrolytes

Popovic Jelena, Hasegawa George, Moudrakovski Igor, Maier Joachim

JOURNAL OF MATERIALS CHEMISTRY A 4 巻 ( 19 ) 頁： 7135 - 7140 2016年

Hard Carbon Anodes for Na-Ion Batteries: Toward a Practical Use

Hasegawa George, Kanamori Kazuyoshi, Kannari Naokatsu, Ozaki Jun-ichi, Nakanishi Kazuki, Abe Takeshi

CHEMELECTROCHEM 2 巻 ( 12 ) 頁： 1917 - 1920 2015年12月

High-performance liquid chromatography separation of unsaturated organic compounds by a monolithic silica column embedded with silver nanoparticles

Zhu Yang, Morisato Kei, Hasegawa George, Moitra Nirmalya, Kiyomura Tsutomu, Kurata Hiroki, Kanamori Kazuyoshi, Nakanishi Kazuki

JOURNAL OF SEPARATION SCIENCE 38 巻 ( 16 ) 頁： 2841 - 2847 2015年8月

High-Level Doping of Nitrogen, Phosphorus, and Sulfur into Activated Carbon Monoliths and Their Electrochemical Capacitances

Hasegawa George, Deguchi Takeru, Kanamori Kazuyoshi, Kobayashi Yoji, Kageyama Hiroshi, Abe Takeshi, Nakanishi Kazuki

CHEMISTRY OF MATERIALS 27 巻 ( 13 ) 頁： 4703 - 4712 2015年7月

Effect of Calcination Conditions on Porous Reduced Titanium Oxides and Oxynitrides via a Preceramic Polymer Route (vol 54, pg 2802, 2015)

Hasegawa George, Sato Tatsuya, Kanamori Kazuyoshi, Sun Cheng-Jun, Ren Yang, Kobayashi Yoji, Kageyama Hiroshi, Abe Takeshi, Nakanishi Kazuki

INORGANIC CHEMISTRY 54 巻 ( 11 ) 頁： 5614 - 5614 2015年6月

Effect of Calcination Conditions on Porous Reduced Titanium Oxides and Oxynitrides via a Preceramic Polymer Route

Hasegawa George, Sato Tatsuya, Kanamori Kazuyoshi, Sun Cheng-Jun, Ren Yang, Kobayashi Yoji, Kageyama Hiroshi, Abe Takeshi, Nakanishi Kazuki

INORGANIC CHEMISTRY 54 巻 ( 6 ) 頁： 2802 - 2808 2015年3月

Ultralow-Density, Transparent, Superamphiphobic Boehmite Nanofiber Aerogels and Their Alumina Derivatives

Hayase Gen, Nonomura Kazuya, Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

CHEMISTRY OF MATERIALS 27 巻 ( 1 ) 頁： 3 - 5 2015年1月

Hierarchically Porous Li4Ti5O12 Anode Materials for Li- and Na-Ion Batteries: Effects of Nanoarchitectural Design and Temperature Dependence of the Rate Capability

Hasegawa George, Kanamori Kazuyoshi, Kiyomura Tsutomu, Kurata Hiroki, Nakanishi Kazuki, Abe Takeshi

ADVANCED ENERGY MATERIALS 5 巻 ( 1 ) 2015年1月

Impact of Electrolyte on Pseudocapacitance and Stability of Porous Titanium Nitride (TiN) Monolithic Electrode

Hasegawa George, Kitada Atsushi, Kawasaki Shota, Kanamori Kazuyoshi, Nakanishi Kazuki, Kobayashi Yoji, Kageyama Hiroshi, Abe Takeshi

JOURNAL OF THE ELECTROCHEMICAL SOCIETY 162 巻 ( 1 ) 頁： A77 - A85 2015年

Porous chromium-based ceramic monoliths: oxides (Cr2O3), nitrides (CrN), and carbides (Cr3C2)

Kido Yasuki, Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

JOURNAL OF MATERIALS CHEMISTRY A 2 巻 ( 3 ) 頁： 745 - 752 2014年

Synthesis and electrochemical performance of hierarchically porous N-doped TiO2 for Li-ion batteries

Hasegawa George, Sato Tatsuya, Kanamori Kazuyoshi, Nakanishi Kazuki, Abe Takeshi

NEW JOURNAL OF CHEMISTRY 38 巻 ( 4 ) 頁： 1380 - 1384 2014年

Reduction on reactive pore surfaces as a versatile approach to synthesize monolith-supported metal alloy nanoparticles and their catalytic applications

Moitra Nirmalya, Kanamori Kazuyoshi, Ikuhara Yumi H., Gao Xiang, Zhu Yang, Hasegawa George, Takeda Kazuyuki, Shimada Toyoshi, Nakanishi Kazuki

JOURNAL OF MATERIALS CHEMISTRY A 2 巻 ( 31 ) 頁： 12535 - 12544 2014年

A Superamphiphobic Macroporous Silicone Monolith with Marshmallow-like Flexibility

Hayase Gen, Kanamori Kazuyoshi, Hasegawa George, Maeno Ayaka, Kaji Hironori, Nakanishi Kazuki

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 52 巻 ( 41 ) 頁： 10788 - 10791 2013年10月

Hierarchically Porous Monoliths Based on N-Doped Reduced Titanium Oxides and Their Electric and Electrochemical Properties

Hasegawa George, Sato Tatsuya, Kanamori Kazuyoshi, Nakano Kousuke, Yajima Takeshi, Kobayashi Yoji, Kageyama Hiroshi, Abe Takeshi, Nakanishi Kazuki

CHEMISTRY OF MATERIALS 25 巻 ( 17 ) 頁： 3504 - 3512 2013年9月

Hierarchically porous monoliths of oxygen-deficient anatase TiO2-x with electronic conductivity

Kitada Atsushi, Hasegawa George, Kobayashi Yoji, Miyazaki Kohei, Abe Takeshi, Kanamori Kazuyoshi, Nakanishi Kazuki, Kageyama Hiroshi

RSC ADVANCES 3 巻 ( 20 ) 頁： 7205 - 7208 2013年

New Li2FeSiO4-carbon monoliths with controlled macropores: effects of pore properties on electrode performance

Hasegawa George, Sannohe Mai, Ishihara Yuya, Kanamori Kazuyoshi, Nakanishi Kazuki, Abe Takeshi

PHYSICAL CHEMISTRY CHEMICAL PHYSICS 15 巻 ( 22 ) 頁： 8736 - 8743 2013年

Hierarchically Porous Monoliths of Oxygen-deficient Anatase TiO2-x with Electronic Conductivity (vol 3, pg 7205, 2013)

Kitada Atsushi, Hasegawa George, Kobayashi Yoji, Miyazaki Kohei, Abe Takeshi, Kanamori Kazuyoshi, Nakanishi Kazuki, Kageyama Hiroshi

RSC ADVANCES 3 巻 ( 48 ) 頁： 26475 - 26475 2013年

New Insights into the Relationship between Micropore Properties, Ionic Sizes, and Electric Double-Layer Capacitance in Monolithic Carbon Electrodes

Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Abe Takeshi

JOURNAL OF PHYSICAL CHEMISTRY C 116 巻 ( 50 ) 頁： 26197 - 26203 2012年12月

Selective Preparation of Macroporous Monoliths of Conductive Titanium Oxides TinO2n-1 (n=2, 3, 4, 6)

Kitada Atsushi, Hasegawa George, Kobayashi Yoji, Kanamori Kazuyoshi, Nakanishi Kazuki, Kageyama Hiroshi

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 134 巻 ( 26 ) 頁： 10894 - 10898 2012年7月

Facile preparation of macroporous graphitized carbon monoliths from iron-containing resorcinol-formaldehyde gels

Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

MATERIALS LETTERS 76 巻頁： 1 - 4 2012年6月

Pore properties of hierarchically porous carbon monoliths with high surface area obtained from bridged polysilsesquioxanes

Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

MICROPOROUS AND MESOPOROUS MATERIALS 155 巻頁： 265 - 273 2012年6月

Flower-like surface modification of titania materials by lithium hydroxide solution

Hasegawa George, Kanamori Kazuyoshi, Sugawara Yoshihiro, Ikuhara Yuichi, Nakanishi Kazuki

JOURNAL OF COLLOID AND INTERFACE SCIENCE 374 巻頁： 291 - 296 2012年5月

New Monolithic Capillary Columns with Well-Defined Macropores Based on Poly(styrene-co-divinylbenzene)

Hasegawa George, Kanamori Kazuyoshi, Ishizuka Norio, Nakanishi Kazuki

ACS APPLIED MATERIALS & INTERFACES 4 巻 ( 5 ) 頁： 2343 - 2347 2012年5月

Facile Preparation of Monolithic LiFePO4/Carbon Composites with Well-Defined Macropores for a Lithium-Ion Battery

Hasegawa George, Ishihara Yuya, Kanamori Kazuyoshi, Miyazaki Kohei, Yamada Yuki, Nakanishi Kazuki, Abe Takeshi

CHEMISTRY OF MATERIALS 23 巻 ( 23 ) 頁： 5208 - 5216 2011年12月

New hierarchically porous titania monoliths for chromatographic separation media

Hasegawa George, Morisato Kei, Kanamori Kazuyoshi, Nakanishi Kazuki

JOURNAL OF SEPARATION SCIENCE 34 巻 ( 21 ) 頁： 3004 - 3010 2011年11月

Preparation of Hierarchically Porous Nanocrystalline CaTiO3, SrTiO3 and BaTiO3 Perovskite Monoliths

Ruzimuradov Olim, Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

JOURNAL OF THE AMERICAN CERAMIC SOCIETY 94 巻 ( 10 ) 頁： 3335 - 3339 2011年10月

Fabrication of highly crosslinked methacrylate-based polymer monoliths with well-defined macropores via living radical polymerization

Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Yamago Shigeru

POLYMER 52 巻 ( 21 ) 頁： 4644 - 4647 2011年9月

Facile preparation of monolithic magnesium titanates with hierarchical porosity

Ruzimuradov Olim N., Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN 119 巻 ( 1390 ) 頁： 440 - 444 2011年6月

Hierarchically Porous Carbon Monoliths with High Surface Area from Bridged Poly(silsesquioxane) without Thermal Activation Process

Hasegawa G., Kanamori K., Nakanishi K., Hanada T.

3RD INTERNATIONAL CONGRESS ON CERAMICS (ICC): NOVEL CHEMICAL PROCESSING SOL-GEL AND SOLUTION-BASED PROCESSING 18 巻 2011年

Monolithic electrode for electric double-layer capacitors based on macro/meso/microporous S-Containing activated carbon with high surface area

Hasegawa George, Aoki Mami, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi, Tadanaga Kiyoharu

JOURNAL OF MATERIALS CHEMISTRY 21 巻 ( 7 ) 頁： 2060 - 2063 2011年

Facile Preparation of Hierarchically Porous TiO2 Monoliths

Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

JOURNAL OF THE AMERICAN CERAMIC SOCIETY 93 巻 ( 10 ) 頁： 3110 - 3115 2010年10月

Fabrication of activated carbons with well-defined macropores derived from sulfonated poly(divinylbenzene) networks

Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

CARBON 48 巻 ( 6 ) 頁： 1757 - 1766 2010年5月

A New Route to Monolithic Macroporous SiC/C Composites from Biphenylene-bridged Polysilsesquioxane Gels

Hasegawa George, Kanamori Kazuyoshi, Nakamshi Kazuki, Hanada Teiichi

CHEMISTRY OF MATERIALS 22 巻 ( 8 ) 頁： 2541 - 2547 2010年4月

Facile preparation of transparent monolithic titania gels utilizing a chelating ligand and mineral salts

Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 53 巻 ( 1 ) 頁： 59 - 66 2010年1月

Hierarchically porous carbon monoliths with high surface area from bridged polysilsesquioxanes without thermal activation process

Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

CHEMICAL COMMUNICATIONS 46 巻 ( 42 ) 頁： 8037 - 8039 2010年

Macro- and microporous carbon monoliths with high surface areas pyrolyzed from poly(divinylbenzene) networks

Hasegawa Joji, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

COMPTES RENDUS CHIMIE 13 巻 ( 1-2 ) 頁： 207 - 211 2010年

Rigid Crosslinked Polyacrylamide Monoliths with Well-Defined Macropores Synthesized by Living Polymerization

Hasegawa Joji, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi, Yamago Shigeru

MACROMOLECULAR RAPID COMMUNICATIONS 30 巻 ( 12 ) 頁： 986 - 990 2009年6月

Pore Formation in Poly(divinylbenzene) Networks Derived from Organotellurium-Mediated Living Radical Polymerization

Hasegawa Joji, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi, Yamago Shigeru

MACROMOLECULES 42 巻 ( 4 ) 頁： 1270 - 1277 2009年2月

Fabrication of macroporous silicon carbide ceramics by intramolecular carbothermal reduction of phenyl-bridged polysilsesquioxane

Hasegawa George, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi

JOURNAL OF MATERIALS CHEMISTRY 19 巻 ( 41 ) 頁： 7716 - 7720 2009年

Preparation of Macroporous Poly(divinylbenzene) Gels Via Living Radical Polymerization

Hasegawa Joji, Kanamori Kazuyoshi, Nakanishi Kazuki, Hanada Teiichi, Yamago Shigeru

POLYMER-BASED SMART MATERIALS - PROCESSES, PROPERTIES AND APPLICATION 1134 巻頁： 139 - + 2009年

Facile Synthesis of Macroporous Cross-Linked Methacrylate Gels by Atom Transfer Radical Polymerization

Kanamori Kazuyoshi, Hasegawa Joji, Nakanishi Kazuki, Hanada Tefichi

MACROMOLECULES 41 巻 ( 19 ) 頁： 7186 - 7193 2008年10月

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