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首页> 外文期刊>Inorganic Chemistry Frontiers >A facile low-temperature synthesis of hierarchical porous Co3O4 micro/nano structures derived from ZIF-67 assisted by ammonium perchlorate
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A facile low-temperature synthesis of hierarchical porous Co3O4 micro/nano structures derived from ZIF-67 assisted by ammonium perchlorate

机译：衍生自高氯酸铵辅助ZIF-67的分层多孔CO3O4微/纳米结构的容易低温合成

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摘要

The thermolysis of metal-organic frameworks (MOFs) opens a new window for the fabrication of oxide semiconductors due to its simplicity, low cost and large-area uniformity of the resulting material. However, this approach usually requires high annealing temperatures over 350 degrees C. In this work, sub-micro hierarchical porous Co3O4 dodecahedra were synthesized by the thermolysis of zeolitic imidazolate frameworks 67 (ZIF-67) at a low temperature of 268 degrees C assisted by ammonium perchlorate (AP), in which ZIF-67 was employed as a metal source and a sacrificial template. The formation mechanism was probably attributable to the generation of Co-O bonds between the Co atom of ZIF-67 and the O atom of AP at lower temperatures which can accelerate the weakening of Co-N bonds of ZIF-67 and thus lead to an abrupt decomposition of ZIF-67 at 268 degrees C. More importantly, the generation of the Co-O bond and the weakening of the Co-N bond were identified using the FTIR, Raman and XPS results. As confirmed by DFT results, ZIF-67 can be decomposed into Co3O4 at lower temperatures assisted by AP than that in air. In addition, the obtained sub-micro hierarchical porous Co3O4 dodecahedra showed a very large specific surface area of 106.11 m(2) g(-1), much larger than that in previous reports. Therefore, this work can provide a novel atomic insight into the formation mechanism of Co3O4 hierarchical porous structures derived from ZIF-67 with AP at lower temperatures and also an energy-efficient method to synthesize porous metal oxide structures.
机译：由于其简单，低成本和所得材料的大面积均匀性，金属有机框架（MOF）的热解弹出一个新的窗口，用于制造氧化物半导体。然而，这种方法通常需要超过350℃的高退火温度。在该工作中，通过沸石咪唑酯框架67（ZIF-67）的热解，在268℃的低温下，通过高氯酸铵（AP），其中ZIF-67用作金属源和牺牲模板。形成机制可能归因于在诸如较低温度下产生ZIF-67的CO原子和AP的O原子之间的CO-O键，这可以加速ZIF-67的CO-N键的弱化，从而导致ZIF-67在268℃下突然分解。更重要的是，使用FTIR，拉曼和XPS结果鉴定了CO-O键的产生和CO-N键的弱化。如通过DFT结果的确认，ZIF-67可以在AP辅助的较低温度下分解成C​​O3O4而不是空气中的较低温度。此外，所获得的亚微型分层多孔Co3O4十二型覆盖物显示出非常大的比表面积为106.11m（2）g（-1），比先前报告中的大得多大。因此，该作品可以在较低温度下与AP的ZIF-67衍生自ZIF-67的CO3O4分层多孔结构的形成机制，以及合成多孔金属氧化物结构的能量有效方法，提供新的原子洞察。

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  • 来源
    《Inorganic Chemistry Frontiers》 |2019年第3期|共8页
  • 作者

    Zhao Kun; Li Haitao; Tian Shouqin; Yang Wenjuan; Wang Xiaoxia; Pang Aimin; Xie Changsheng; Zeng Dawen;

  • 作者单位

    Huazhong Univ Sci &

    Technol Dept Mat Sci &

    Engn State Key Lab Mat Proc &

    Die &

    Mould Technol Nanomat &

    Smart Sensors Res Lab NSSRL 1037 Luoyu Rd Wuhan 430074 Peoples R China;

    Huazhong Univ Sci &

    Technol Dept Mat Sci &

    Engn State Key Lab Mat Proc &

    Die &

    Mould Technol Nanomat &

    Smart Sensors Res Lab NSSRL 1037 Luoyu Rd Wuhan 430074 Peoples R China;

    Wuhan Univ Technol State Key Lab Silicate Mat Architectures 122 Luoshi Rd Wuhan 430070 Peoples R China;

    Yulin Univ Sch Chem &

    Chem Engn Yulin City 719000 Shaanxi Peoples R China;

    Huazhong Univ Sci &

    Technol Dept Mat Sci &

    Engn State Key Lab Mat Proc &

    Die &

    Mould Technol Nanomat &

    Smart Sensors Res Lab NSSRL 1037 Luoyu Rd Wuhan 430074 Peoples R China;

    Hubei Inst Aerosp Chemotechnol Xiangyang 441003 Hubei Peoples R China;

    Huazhong Univ Sci &

    Technol Dept Mat Sci &

    Engn State Key Lab Mat Proc &

    Die &

    Mould Technol Nanomat &

    Smart Sensors Res Lab NSSRL 1037 Luoyu Rd Wuhan 430074 Peoples R China;

    Huazhong Univ Sci &

    Technol Dept Mat Sci &

    Engn State Key Lab Mat Proc &

    Die &

    Mould Technol Nanomat &

    Smart Sensors Res Lab NSSRL 1037 Luoyu Rd Wuhan 430074 Peoples R China;

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  • 正文语种 eng
  • 中图分类 无机化学;
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