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  • S,N-Containing Co-MOF derived Co9S8@S, N-doped carbon materials as efficient oxygen electrocatalysts and supercapacitor electrode materials

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    Author(s)
    Liu, Shengwen
    Tong, Mingyu
    Liu, Guoqiang
    Zhang, Xian
    Wang, Zhaoming
    Wang, Guozhong
    Cai, Weiping
    Zhang, Haimin
    Zhao, Huijun
    Griffith University Author(s)
    Zhao, Huijun
    Year published
    2017
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    Abstract
    Controllable synthesis of metal–organic framework (MOF) materials with tunable morphologies, sizes, compositions and pore structures is critically important for MOF materials and their pyrolysis derivatives’ applications in environmental and energy fields. Here we report the synthesis of Co-MOF crystals with controllable morphologies, sizes and S/N ratios in water/NaOH and ethylene glycol/NaOH systems using thiophene-2,5-dicarboxylate (Tdc) and 4,4′-bipyridine (Bpy) as S, N dual organic ligands by a “pillar-layer” assembly method. Water and ethylene glycol with different viscosities result in various crystallization processes ...
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    Controllable synthesis of metal–organic framework (MOF) materials with tunable morphologies, sizes, compositions and pore structures is critically important for MOF materials and their pyrolysis derivatives’ applications in environmental and energy fields. Here we report the synthesis of Co-MOF crystals with controllable morphologies, sizes and S/N ratios in water/NaOH and ethylene glycol/NaOH systems using thiophene-2,5-dicarboxylate (Tdc) and 4,4′-bipyridine (Bpy) as S, N dual organic ligands by a “pillar-layer” assembly method. Water and ethylene glycol with different viscosities result in various crystallization processes of [Co(Tdc)(Bpy)]n crystals in the corresponding reaction system, thus respectively obtaining three-dimensional (3D) Co-MOF ([Co(Tdc)(Bpy)]n) bulk and cuboid structures in water/NaOH and ethylene glycol/NaOH reaction systems. The as-prepared Co-MOF crystals in two different reaction systems were further pyrolytically treated at 800 °C in a N2 atmosphere to obtain Co9S8@S,N-doped carbon materials with different surface areas, pore distributions and S/N doping ratios. As electrocatalysts, the Co9S8@S,N-doped carbon cuboid (Co9S8@SNCC) obtained in the ethylene glycol/NaOH system demonstrates superior bifunctional electrocatalytic activities toward both oxygen reduction and evolution reactions resulting from Co9S8 and S, N doping in the carbon structure providing catalytic active sites, better than that of Co9S8@S,N-doped carbon bulk (Co9S8@SNCB) obtained in the water/NaOH system and comparable to commercial Pt/C and RuO2 catalysts. Owing to its high surface area and porous structure, Co9S8@SNCC also exhibits great potential as the electrode material for application in supercapacitors, with high performance and recycling stability.
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    Journal Title
    Inorganic Chemistry Frontiers
    Volume
    4
    DOI
    https://doi.org/10.1039/C6QI00403B
    Copyright Statement
    © 2017 Royal Society of Chemistry. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal website for access to the definitive, published version.
    Subject
    Inorganic chemistry
    Inorganic chemistry not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/368782
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