研究者詳細 - 中西　和樹

論文 - 中西　和樹

分割表示 412 件中 161 - 180 件目／全件表示 >>

Pore structure control of macroporous methylsilsesquioxane monoliths prepared by in situ two-step processing 査読有り

Guo, XZ; Yu, H; Yang, H; Kanamori, K; Zhu, Y; Nakanishi, K

JOURNAL OF POROUS MATERIALS 20 巻 ( 6 ) 頁： 1477 - 1483 2013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：Journal of Porous Materials

Macroporous methylsilsesquioxane (MSQ) monoliths have been prepared by in situ two-step processing using an initial acid catalysis step accompanied by an epoxide-mediated condensation step in the presence of ammonium chloride (NH 4Cl). We investigate the effects of duration time of acidic step, heat-treatment and hydrothermal treatment on the macroporous morphology and pore structures of MSQ monoliths. The duration time of acidic step gives an important effect on the macroporous morphology and pore structures of MSQ monoliths, resulting from the polymerization of MSQ. Heat-treatment and hydrothermal treatment basically do not spoil the macroporous morphology of MSQ monoliths, while obviously varies the mesopore/micropore structures including pore size, pore volume, and pore size distribution. The macroporous MSQ materials with thick skeleton and intrinsic hydrophobicity are promising for wide applications such as ultra performance liquid chromatography (UPLC), superhydrophobic materials and so on. © 2013 Springer Science+Business Media New York.

DOI： 10.1007/s10934-013-9733-z

Recyclable Functionalization of Silica with Alcohols via Dehydrogenative Addition on Hydrogen Silsesquioxane 査読有り

Moitra, N; Kamei, T; Kanamori, K; Nakanishi, K; Takeda, K; Shimada, T

LANGMUIR 29 巻 ( 39 ) 頁： 12243 - 12253 2013年10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：Langmuir

Synthesis of class II hybrid silica materials requires the formation of covalent linkage between organic moieties and inorganic frameworks. The requirement that organosilylating agents be present to provide the organic part limits the synthesis of functional inorganic oxides, however, due to the water sensitivity and challenges concerning purification of the silylating agents. Synthesis of hybrid materials with stable molecules such as simple alcohols, rather than with these difficult silylating agents, may therefore provide a path to unprecedented functionality. Herein, we report the novel functionalization of silica with organic alcohols for the first time. Instead of using hydrolyzable organosilylating agents, we used stable organic alcohols with a Zn(II) catalyst to modify the surface of a recently discovered highly reactive macro-mesoporous hydrogen silsesquioxane (HSQ, HSiO1.5) monolith, which was then treated with water with the catalyst to form surface- functionalized silica. These materials were comprehensively characterized with FT-IR, Raman, solid-state NMR, fluorescence spectroscopy, thermal analysis, elemental analysis, scanning electron microscopy, and nitrogen adsorption-desorption measurements. The results obtained from these measurements reveal facile immobilization of organic moieties by dehydrogenative addition onto surface silane (Si-H) at room temperature with high loading and good tolerance of functional groups. The organic moieties can also be retrieved from the monoliths for recycling and reuse, which enables cost-effective and ecological use of the introduced catalytic/reactive surface functionality. Preservation of the reactivity of as-immobilized organic alcohols has been confirmed, moreover, by successfully performing copper-catalyzed azide-alkyne cycloaddition (CuAAC) "click" reactions on the immobilized silica surfaces. © 2013 American Chemical Society.

DOI： 10.1021/la402205j

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

Hasegawa, G; Sato, T; Kanamori, K; Nakano, K; Yajima, T; Kobayashi, Y; Kageyama, H; Abe, T; Nakanishi, K

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

In this report, we demonstrate a novel synthesis method to obtain reduced titanium oxides with monolithic shape and with a well-defined hierarchically porous structure from the titanium-based network bridged with ethylenediamine. The hierarchically porous monoliths are fabricated by the nonhydrolytic sol-gel reaction accompanied by phase separation. This method allows a low-temperature crystallization into Ti4O7 and Ti3O5 at 800 and 900 C, respectively, with N-doped carbon. These reduced titanium oxides are well-doped with N atoms even under argon atmosphere without NH 3, which accounts for the low-temperature reduction. The resultant monolithic materials possess controllable macropores and high specific surface area together with excellent electric conductivity up to 230 S cm-1, indicating promise as a conductive substrate that can substitute carbon electrodes. © 2013 American Chemical Society.

DOI： 10.1021/cm401933a

Synthesis of Concentrated Polymer Brushes via Surface-Initiated Organotellurium-Mediated Living Radical Polymerization 査読有り

Yamago, S; Yahata, Y; Nakanishi, K; Konishi, S; Kayahara, E; Nomura, A; Goto, A; Tsujii, Y

MACROMOLECULES 46 巻 ( 17 ) 頁： 6777 - 6785 2013年9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：Macromolecules

An organotellurium chain transfer agent (CTA) bearing a triethoxysilyl group at one end and a 2-methyltellanyl-2-methylpropionate group at the other was prepared and immobilized on the surface of a silicon wafer and silica nanoparticle (SiP). Surface-initiated organotellurium-mediated living radical polymerization (SI-TERP) from the immobilized CTA in the presence of nonimmobilized (free) organotellurium CTA was examined. Concentrated polymer brushes (CPBs) having surface occupancies above 0.1 were prepared by polymerization of various monomers, including styrene, methyl methacrylate, butyl acrylate, N-isopropyl acrylamide, N-vinyl pyrrolidone (NVP), and N-vinyl carbazole (NVC). All CPBs were formed in a controlled manner, with number-average molecular weights close to the theoretical values and low polydispersity indices (<1.41). Structurally well-controlled CPBs comprising unconjugated monomers, NVP and NVC, were prepared for the first time. Atomic force microscopy and transmission electron microscopy analyses of the CPBs revealed the highly stretched and anisotropic structure of the grafted polymer chain in a good solvent. © 2013 American Chemical Society.

DOI： 10.1021/ma401385a

Preparation of mullite monoliths with well-defined macropores and mesostructured skeletons via the sol-gel process accompanied by phase separation 査読有り

Guo, XZ; Li, WY; Nakanishi, K; Kanamori, K; Zhu, Y; Yang, H

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 33 巻 ( 10 ) 頁： 1967 - 1974 2013年9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：Journal of the European Ceramic Society

Mullite monoliths with well-defined macropores and mesostructured skeletons have been prepared via the sol-gel process accompanied by phase separation in the presence of poly(ethylene oxide) (PEO). Gelation of Al2O3-SiO2 binary system with chloride salts as an additional precursor has been mediated by propylene oxide (PO) as an acid scavenger, while PEO worked as a phase-separation inducer. The dried gel and that heat-treated at 800°C are amorphous, and γ-Al2O3 or Si-Al spinel phase nanocrystals are crystallized at 900-1000°C. After heat-treated at and above 1100°C for 5h, the complete crystalline mullite is generated, and the macroporous monoliths in large dimensions of more than 15mm×15mm×10mm are obtained. Heat-treatment at 200-1400°C does not basically spoil the macroporous structure of monoliths, while decreases the macropore size and significantly alters the phase compositions and micro-mesoporous structure. © 2013 Elsevier Ltd.

DOI： 10.1016/j.jeurceramsoc.2013.02.018

Sol-gel synthesis of macroporous TiO<sub>2</sub> from ionic precursors via phase separation route 査読有り

Li, WY; Guo, XZ; Zhu, Y; Hui, Y; Kanamori, K; Nakanishi, K

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 67 巻 ( 3 ) 頁： 639 - 645 2013年9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：Journal of Sol-Gel Science and Technology

Monolithic macroporous titanium dioxide (TiO2) derived from ionic precursors has been successfully prepared via the sol-gel route accompanied by phase separation in the presence of formamide (FA) and poly(vinylpyrrolidone) (PVP). The addition of FA promotes the gelation, whereas PVP enhances the polymerization-induced phase separation. Appropriate choice of the starting compositions allows the production of cocontinuous macroporous TiO2 monoliths in large dimensions, and controls the size of macropores. The resultant dried gel is amorphous, whereas anatase and rutile phases are precipitated at 500 and 900 C respectively, without spoiling the macroporous morphology. Nitrogen adsorption-desorption measurements revealed that the dried gels exhibits mesostructure with a median pore size of about 3 nm and BET surface area of 228 m2/g, whereas 15 nm and 73 m 2/g for the gels calcined at 600 C. © 2013 Springer Science+Business Media New York.

DOI： 10.1007/s10971-013-3123-5

その他リンク： http://orcid.org/0000-0002-8069-4780

Gelation behavior and phase separation of macroporous methylsilsesquioxane monoliths prepared by in situ two-step processing 査読有り

Guo, XZ; Li, WY; Yang, H; Kanamori, K; Zhu, Y; Nakanishi, K

JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY 67 巻 ( 2 ) 頁： 406 - 413 2013年8月

Hierarchically porous nickel/carbon composite monoliths prepared by sol-gel method from an ionic precursor 査読有り

Kido, Y; Nakanishi, K; Okumura, N; Kanamori, K

MICROPOROUS AND MESOPOROUS MATERIALS 176 巻頁： 64 - 70 2013年8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：Microporous and Mesoporous Materials

Utilizing a facile sol-gel reaction accompanied by phase separation, rigid monolithic nickel hydroxide-based xerogels and nickel/carbon composites with hierarchical porosity have been successfully fabricated. In the synthetic route starting from nickel chloride as a nickel precursor, trimethylene oxide acts as a gelation initiator to increase pH in a reaction solution. In addition, poly(acrylic acid) plays a double role as a phase separation inducer and as a co-constituent with nickel hydroxide to comprise continuous gel skeletons in the micrometer range. As a result, obtained xerogels possess well-defined macropores evidenced by microscopy observation and mercury porosimetry. Subsequent heat-treatment in air led to the crystallization of NiO at 300 C, while calcination under argon flow brought about the formation of nickel/carbon (Ni/C) composites with hierarchical pores and large specific surface area at temperatures higher than 300 C. This is the first report on the preparation of rigid monolithic xerogels and metal/carbon composite with well-defined macropores based on a metal salt precursor containing "divalent" cation. © 2013 Elsevier B.V.All rights reserved.

DOI： 10.1016/j.micromeso.2013.03.042

Preparation of a hierarchically porous AlPO<sub>4</sub> monolith via an epoxide-mediated sol-gel process accompanied by phase separation 査読有り

Li, WY; Zhu, Y; Guo, XZ; Nakanishi, K; Kanamori, K; Yang, H

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 14 巻 ( 4 ) 頁： 045007 2013年8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：Science and Technology of Advanced Materials

Monolithic aluminum phosphate (AlPO4) with a macro-mesoporous structure has been successfully prepared via the sol-gel process accompanied by phase separation in the presence of poly(ethylene oxide) (PEO). Gelation of the system has been mediated by propylene oxide (PO), while PEO induces a phase separation. The dried gel is amorphous, whereas the crystalline tridymite phase precipitates upon heating above 1000 °C. Heat treatment does not spoil the macroporous morphology of the AlPO4 monoliths. Nitrogen adsorption-desorption measurements revealed that the skeletons of the dried gels possess a mesostructure with a median pore size of about 30 nm and a surface area as high as 120 m2 g-1. Hydrothermal treatment before heat treatment can increase the surface area to 282 m2 g -1. © 2013 National Institute for Materials Science.

DOI： 10.1088/1468-6996/14/4/045007

Synthesis of Hierarchically Porous Hydrogen Silsesquioxane Monoliths and Embedding of Metal Nanoparticles by On-Site Reduction 査読有り

Moitra, N; Kanamori, K; Shimada, T; Takeda, K; Ikuhara, YH; Gao, X; Nakanishi, K

ADVANCED FUNCTIONAL MATERIALS 23 巻 ( 21 ) 頁： 2714 - 2722 2013年6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：Advanced Functional Materials

A facile synthesis of a new class of reactive porous materials is reported: hierarchically porous hydrogen silsesquioxane (HSiO1.5, HSQ) monoliths with well-defined macropores and mesopores. The HSQ monoliths are prepared via sol-gel accompanied by phase separation in a mild condition, and contain micrometer-sized co-continuous macropores and high specific surface area reaching up to 800 m2 g-1 because of the small mesopores. A total preservation of Si-H, which is always an issue of HSQ materials, is confirmed by 29Si solid-state NMR. The HSQ monolith has then been subjected to reduction of noble metal ions to their corresponding metal nanoparticles in simple aqueous solutions under an ambient condition. The nanoparticles produced in this manner are immobilized on the HSQ monolith and are characterized by X-ray diffraction (XRD) and high angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Both the bare HSQ and nanoparticles-embedded HSQ are promising as heterogeneous catalysts, exhibiting reusability and recyclability. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

DOI： 10.1002/adfm.201202558

Fabrication of large-sized silica monolith exceeding 1000 mL with high structural homogeneity 査読有り

Miyamoto, R; Ando, Y; Kurusu, C; Bai, HZ; Nakanishi, K; Ippommatsu, M

JOURNAL OF SEPARATION SCIENCE 36 巻 ( 12 ) 頁： 1890 - 1896 2013年6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：Journal of Separation Science

Reproducible fabrication of the hierarchically porous monolithic silica in a large volume exceeding 1000 mL has been established. By the hydrothermal enlargement of the fully accessible small pores to exceed 50 nm in diameter, the capillary force emerged on solvent evaporation was dramatically reduced, which allowed the preparation of crack-free monoliths with evaporative solvent removal under an ambient pressure. The local temperature inhomogeneity within a reaction vessel in a large volume was precisely controlled to cancel the heat evolved by the hydrolysis reaction of tetramethoxysilane and that consumed to melt ice cubes dispersed in the solution, resulting in large monolithic silica pieces with improved structural homogeneity. Homogeneity of the pore structure was confirmed, both on macro- and mesoscales, using SEM, mercury intrusion, and nitrogen adsorption/desorption measurements. Furthermore, the deviations in chromatographic performance were examined by evaluating multiple smaller monolithic columns prepared from the monolithic silica pieces cut from different parts of a large monolith. All the daughter columns thus prepared exhibited comparable performances to each other to prove the overall homogeneity of the mother monolith. Preliminary results on high-speed separation of peptides and proteins by the octadecylsilylated silica monolith of the above production have also been demonstrated. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

DOI： 10.1002/jssc.201300123

Synthesis of Silver Nanoparticles Confined in Hierarchically Porous Monolithic Silica: A New Function in Aromatic Hydrocarbon Separations 査読有り

Zhu, Y; Morisato, K; Li, WY; Kanamori, K; Nakanishi, K

ACS APPLIED MATERIALS & INTERFACES 5 巻 ( 6 ) 頁： 2118 - 2125 2013年3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 Materials and Interfaces

Silver nanoparticles (Ag NPs) have been homogeneously introduced into hierarchically porous monolithic silica columns with well-defined macropores and SBA-15-type hexagonally ordered mesopores by using ethanol as the mild reductant. Within the cylindrical silica mesopores treated with aminopropyl groups as the host, monocrystalline Ag NPs and nanorods are obtained after being treated in silver nitrate/ethanol solution at room temperature for different durations of reducing time. The loading of Ag NPs in the monolith can be increased to 33 wt % by the repetitive treatment, which also led to the formation of polycrystalline Ag nanorods in the mesopores. Although the bare silica column cannot separate aromatic hydrocarbons, good separation of those molecules by noncharged Ag NPs confined in the porous structure of the monolith has been for the first time demonstrated with the Ag NP-embedded silica column. The NP-embedded monolithic silica would be a powerful separation tool for hydrocarbons with different number, position, and configuration of unsaturated bonds. © 2013 American Chemical Society.

DOI： 10.1021/am303163s

Macroporous SiO<sub>2</sub> Monoliths Prepared <i>via</i> Sol-Gel Process Accompanied by Phase Separation 査読有り

Guo, XZ; Li, WY; Zhu, Y; Nakanishi, K; Kanamori, K; Yang, H

ACTA PHYSICO-CHIMICA SINICA 29 巻 ( 3 ) 頁： 646 - 652 2013年3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：Wuli Huaxue Xuebao/ Acta Physico - Chimica Sinica

Macroporous SiO2 monoliths were prepared via a sol-gel process accompanied by phase separation using a tetramethoxysilane (TMOS) precursor, 0.01 mol·L-1 HCl catalyst, propylene oxide (PO) gelation agent, and poly(ethylene oxide) (PEO, viscosity-averaged molecular weight (Mv): 10000) phase separation inducer. Monoliths were characterized by differential thermal analysis/thermogravimetry (DTA/ TG), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), mercury porosimetry, and nitrogen adsorption/desorption analysis (BET). The mechanism of the epoxide-mediated sol-gel reaction and PEO induced phase separation was discussed. The addition of PEO induced phase separation, and monolithic SiO2 with a cocontinuous macroporous skeletal structure was obtained at PEO/TMOS molar ratio of 0.0018. Monoliths had a narrow pore size distribution of 1-3 μm, surface area as high as 719 m2·g-1 and pore volume of 0.48 m3·g-1. This sol-gel transition is mediated by PO because of its strong nucleophilic properties and irreversible ring-opening reaction. Simultaneous phase separation is induced by PEO adsorbed on the SiO2 oligomers. © Editorial office of Acta Physico-Chimica Sinica.

DOI： 10.3866/PKU.WHXB201212252

New Li<sub>2</sub>FeSiO<sub>4</sub>-carbon monoliths with controlled macropores: effects of pore properties on electrode performance 査読有り

Hasegawa, G; Sannohe, M; Ishihara, Y; Kanamori, K; Nakanishi, K; Abe, T

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

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Chemistry Chemical Physics

Monolithic Li2FeSiO4-carbon composites with well-defined macropores have been prepared from the silica-based gels containing Li, Fe, and carbon sources. The macroporous precursor gels can be fabricated by the sol-gel method accompanied by phase separation. A fine control of the macropore size in the resultant composites has been achieved by controlling the macropore size of the precursor gels simply by adjusting the starting compositions. The effects of pore properties on Li insertion-extraction capabilities have been investigated by utilizing the resultant Li 2FeSiO4-carbon composites as the cathode of lithium ion batteries. The electrodes prepared from the Li2FeSiO 4-carbon composites with different macropore sizes exhibit significant differences in the charge-discharge properties. The results strongly suggest that the smaller macropore size (equal to the thinner macropore skeletons) and the presence of micro- and mesopores in the macropore skeletons (hierarchically porous structure) are desirable for a better electrode in the case of Li2FeSiO4, which has extremely low ionic and electrical conductivities. © 2013 The Owner Societies.

DOI： 10.1039/c3cp50352f

Sol-gel synthesis of zinc ferrite-based xerogel monoliths with well-defined macropores 査読有り

Kido, Y; Nakanishi, K; Kanamori, K

RSC ADVANCES 3 巻 ( 11 ) 頁： 3661 - 3666 2013年

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

Starting from an aqueous solution, porous zinc ferrite-based xerogel monoliths have been prepared via a sol-gel route accompanied by phase separation mediated by propylene oxide in the presence of poly(acrylamide). The xerogels possess well-defined macropores, and the macroporous morphologies could be easily controlled (macropore size ranges from 0.55 to 1.29 μm) by simply changing the starting composition. As-dried xerogel samples were amorphous under X-ray diffraction, while heat-treatment in air brought about the formation of spinel type ferrite phase, ZnFe<inf>2</inf>O<inf>4</inf>. Calcination under Ar atmosphere allowed the crystallization of various iron-based phases/carbon composites (Fe<inf>3</inf>O<inf>4</inf>, Fe<inf>1-δ</inf>O, Fe <inf>3</inf>N, Fe<inf>4</inf>N, Fe<inf>3</inf>C, and Fe). Samples heated under Ar flow exhibited hierarchical pore structures, including continuous macropores, in addition to mesopores and micropores embedded in the carbon-containing composite matrices. © 2013 The Royal Society of Chemistry.

DOI： 10.1039/c3ra22481c

Erratum: Hierarchically porous monoliths of oxygen-deficient anatase TiO<sub>2-x</sub> with electronic conductivity (RSC Advances (2013) DOI:10.1039/C3RA40545A) 査読有り

A. Kitada, G. Hasegawa, Y. Kobayashi, K. Miyazaki, T. Abe, K. Kanamori, K. Nakanishi, H. Kageyama

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

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

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

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

Layered double hydroxide (LDH)-based monolith with interconnected hierarchical channels: enhanced sorption affinity for anionic species 査読有り

Tokudome, Y; Tarutani, N; Nakanishi, K; Takahashi, M

JOURNAL OF MATERIALS CHEMISTRY A 1 巻 ( 26 ) 頁： 7702 - 7708 2013年

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 Materials Chemistry A

Monolithic layered double hydroxides (LDHs) with interconnected channels have been expected to enhance sorption rate as well as increase accumulation of anions. Although powder molding can form easily-handled LDH compacts, interconnected channel formation therein has not been achieved. Herein, we demonstrate cm-scale monolithic LDH-based composites with interconnected hierarchical channels via a spontaneous sol-gel reaction. The synthesis was performed on Mg-Al hydrotalcite-type LDHs starting from metal chlorides aqueous/ethanolic solution with poly(ethylene oxide) incorporated. Addition of propylene oxide triggers a sol-gel reaction to form monolithic xerogels with a formula of [Mg0.66Al0.33(OH)2Cl 0.33·2.92H2O]·3.1Al(OH)3. LDH crystals together with aluminum hydroxide crystals homogeneously build up gel skeletons with well-defined hierarchical channels. The interconnected channel in μm range (macrochannel) are formed as a phase-separated structure, whereas the channel in nm range (nanochannel) are as interstices of primary particles. The channel architectures are preserved in the course of rehydration process, affording enhanced sorption affinity for anion species in the process. Both of macro and mesochannels as well as high charge density of the obtained LDHs (Mg/Al = 2.0) contribute to enhanced anion sorption in the monolithic xerogels. The materials obtained here opens up applications of high performance adsorbents and ion-storage free from diffusion limitation. © 2013 The Royal Society of Chemistry.

DOI： 10.1039/c3ta11110e

Hierarchically porous monoliths of oxygen-deficient anatase TiO<sub>2-<i>x</i></sub> with electronic conductivity 査読有り

Kitada, A; Hasegawa, G; Kobayashi, Y; Miyazaki, K; Abe, T; Kanamori, K; Nakanishi, K; Kageyama, H

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

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

We report an electrically conducting oxygen-deficient anatase TiO 2-x monolith with macro/meso/micro trimodal pores, prepared by reducing insulating porous TiO2 monoliths at low temperature. Without adding any conductive materials, the TiO2-x monolith itself was electrically conducting enough for lithium insertion, potentially opening a new avenue for carbon-free electrode materials. © The Royal Society of Chemistry 2013.

DOI： 10.1039/c3ra40545a

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

Hasegawa, G; Kanamori, K; Nakanishi, K; Abe, T

JOURNAL OF PHYSICAL CHEMISTRY C 116 巻 ( 50 ) 頁： 26197 - 26203 2012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：Journal of Physical Chemistry C

The effects of the pore properties and the ionic sizes on the electric double-layer capacitances have been investigated by using the monolithic carbon electrodes with different pore properties. The carbon monoliths with high surface areas which possess homogeneous pore properties in the whole monoliths were prepared from the bridged-polysilsesquioxane gels via the nanophase extraction technique. The detailed investigations of the pore properties of the carbon monoliths were conducted by the nitrogen physisorption measurement as well as the mercury porosimetry. The electrochemical property of each monolithic carbon electrode was examined by the cyclic voltammetry in the different aqueous electrolytes in order to investigate the effects of the ionic sizes. These fundamental analyses have provided new insights into the efficient micropore sizes in each electrolyte for the superior electric double-layer capacitors. © 2012 American Chemical Society.

DOI： 10.1021/jp309010p

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