Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 46 , Issue 4
Showing 1-50 articles out of 58 articles from the selected issue
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  • Naoaki Yabuuchi
    2017 Volume 46 Issue 4 Pages 412-422
    Published: April 05, 2017
    Released: April 05, 2017
    JOURNALS RESTRICTED ACCESS

    Research interest for a solid-state redox reaction of oxide ions (oxygen) is rapidly increasing for rechargeable battery applications. This article reviews the history and development of charge compensation mechanisms with oxide ions for electrode materials of batteries. Reversible and irreversible processes are observed after the oxidation of oxide ions, and it highly depends on the natures of chemical bonds between transition metals and oxide ions. Future possibility of high-energy lithium/sodium batteries with the oxide ion redox is also discussed.

    Research interest for a solid-state redox reaction of oxide ions (oxygen) is rapidly increasing for rechargeable battery applications. This article reviews the history and development of charge compensation mechanisms with oxide ions for electrode materials of batteries. Reversible and irreversible processes are observed after the oxidation of oxide ions, and it highly depends on the natures of chemical bonds between transition metals and oxide ions. Future possibility of high-energy lithium/sodium batteries with the oxide ion redox is also discussed. Fullsize Image
     
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  • Yanjun Hao, Linxu Xu, Jingyu Lei, Fang Cui, Tieyu Cui, Caiyu Qu
    2017 Volume 46 Issue 4 Pages 426-429
    Published: April 05, 2017
    Released: April 05, 2017
    JOURNALS RESTRICTED ACCESS

    ZnO nanoparticles@SiO2 (ZnO NPs@SiO2) composites have been prepared by a self-catalytic approach in a water–ethanol solution at near neutral conditions. A multifunctional precursor combining not only a silicon alkoxide and a metal carboxylate group, but also a protonated amine group was designed. The intramolecular protonated amine groups could act as catalytic sites for the hydrolysis and condensation of silicon alkoxides. Thus self-catalytic reactions would proceed spontaneously without the addition of any other catalyst. By adjusting the manner of adding the silica source, ZnO NPs with an average diameter of 2.61, 4.00, and 5.72 nm for ZnO NPs@SiO2 composites could be controllably synthesized. Accordingly, the different ZnO NPs@SiO2 composites displayed blue, green, and yellow three emission under ultraviolet light.

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