Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 46 , Issue 8
Showing 1-50 articles out of 62 articles from the selected issue
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  • Yuki Yamada, Atsuo Yamada
    2017 Volume 46 Issue 8 Pages 1056-1064
    Published: August 05, 2017
    Released: August 05, 2017
    JOURNALS RESTRICTED ACCESS

    A non-aqueous electrolyte solution for lithium-ion batteries has been optimized at around 1 mol dm−3 salt concentration based upon ionic conductivity. Recently, however, superconcentrated solutions (e.g., over 3 mol dm−3) are emerging as a new class of liquid electrolyte that develops unique interfacial chemistry on battery electrodes. In this article, we discuss the origin of the unique interfacial chemistry from the viewpoint of their peculiar liquid structure, and highlight advanced rechargeable batteries based on the new electrolyte design.

    Superconcentrated (highly concentrated) solutions are emerging as a new class of liquid electrolytes. They can form a unique anion-derived passivation film on battery electrodes, which is in clear contrast to solvent-derived passivation generally observed in conventional dilute electrolytes. This unique passivation chemistry will bring several breakthroughs in non-aqueous and aqueous rechargeable batteries. Fullsize Image
     
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  • Hikaru Matsumoto, Hirokazu Seto, Takanori Akiyoshi, Makoto Shibuya, Yu ...
    2017 Volume 46 Issue 8 Pages 1065-1067
    Published: August 05, 2017
    Released: August 05, 2017
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    A macroporous monolith comprising a polymer gel matrix was developed for application in continuous-flow catalytic reactions. Nanosized Pd(0) particles were loaded in a poly(N-isopropylacrylamide)-gel-based monolith by Pd(II) adsorption and subsequent reduction. The permeability of the Pd(0)-loaded monolith was compared with a commercial membrane filter with a pore size of several micrometers. The Pd(0)-loaded monolith exhibited excellent productivity in a continuous-flow Suzuki coupling reaction. Moreover, the Pd(0)-loaded monolith showed sustained performance over a 7-day period without Pd leaching.

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  • Hitoshi Kumagai, Yoshiyuki Sakamoto, Hiroyuki Takeda, Shinichi Matsuna ...
    2017 Volume 46 Issue 8 Pages 1112-1115
    Published: August 05, 2017
    Released: August 05, 2017
    JOURNALS RESTRICTED ACCESS

    We report size-controllable syntheses of spherical coordination polymer particles using only K2[Pt(CN)4], Zn(NO3)2·6H2O, and water, and their conversion to Pt-ZnO composite and PtZn alloy. This method can control both the size and surface morphology of coordination polymer particles by changing the concentrations of the starting materials without any organic solvents, surfactants, and heating treatment. For example, the increasing of [Pt(CN)4]2− concentration reduced the particle size and improved the smoothness of particle surface. Thermal treatment of the particles in oxidative atmosphere at 500 °C results in the formation of Pt-ZnO composite. Upon further treatment in reducing atmosphere at 400 °C, the composite was converted to PtZn alloy compound. After conversion to composite and alloy, the initial particle size and surface morphology were retained.

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