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3D Macroscopic Architectures from Self-Assembled MXene Hydrogels

机译：自组装MXene水凝胶的3D宏观结构

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摘要

Assembly of 2D MXene sheets into a 3D macroscopic architecture is highly desirable to overcome the severe restacking problem of 2D MXene sheets and develop MXene-based functional materials. However, unlike graphene, 3D MXene macroassembly directly from the individual 2D sheets is hard to achieve for the intrinsic property of MXene. Here a new gelation method is reported to prepare a 3D structured hydrogel from 2D MXene sheets that is assisted by graphene oxide and a suitable reductant. As a supercapacitor electrode, the hydrogel delivers a superb capacitance up to 370 F g(-1) at 5 A g(-1), and more promisingly, demonstrates an exceptionally high rate performance with the capacitance of 165 F g(-1) even at 1000 A g(-1). Moreover, using controllable drying processes, MXene hydrogels are transformed into different monoliths with structures ranging from a loosely organized porous aerogel to a dense solid. As a result, a 3D porous MXene aerogel shows excellent adsorption capacity to simultaneously remove various classes of organic liquids and heavy metal ions while the dense solid has excellent mechanical performance with a high Young's modulus and hardness.
机译：将2D MXene薄片组装成3D宏观结构非常需要克服2D MXene薄片的严重重新堆叠问题并开发基于MXene的功能材料。但是，与石墨烯不同，要实现MXene的固有特性，直接从单个2D图纸中直接获得3D MXene宏组件是很困难的。此处报道了一种新的凝胶化方法，该方法由2D MXene片材制备3D结构化水凝胶，该方法由氧化石墨烯和合适的还原剂辅助。作为超级电容器电极，水凝胶在5 A g（-1）时可提供高达370 F g（-1）的超强电容，而且更令人鼓舞的是，它具有165 F g（-1）的超高倍率性能即使在1000 A g（-1）下也是如此。此外，通过可控的干燥过程，MXene水凝胶可转变为具有从松散组织的多孔气凝胶到致密固体的结构的不同整料。结果，3D多孔MXene气凝胶显示出出色的吸附能力，可以同时去除各种有机液体和重金属离子，而致密固体则具有出色的机械性能，并具有高的杨氏模量和硬度。

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  • 来源
    《Advanced Functional Materials》 |2019年第33期|1903960.1-1903960.8|共8页
  • 作者

    Shang Tongxin; Lin Zifeng; Qi Changsheng; Liu Xiaochen; Li Pei; Tao Ying; Wu Zhitan; Li Dewang; Simon Patrice; Yang Quan-Hong;

  • 作者单位

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300350, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300350, Peoples R China;

    Sichuan Univ, Coll Mat Sci & Engn, Chengdu 610065, Sichuan, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300350, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300350, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300350, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300350, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300350, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300350, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300350, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300350, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300350, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300350, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300350, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300350, Peoples R China;

    Universal Toulouse, CIRIMAT, CNRS, INPT, UPS 118 Route Narbonne, F-31062 Toulouse, France;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300350, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300350, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    3D assembly; monoliths; MXene hydrogels; rate performance;

    机译：3D组装;雄性;蒙薄水凝胶;率表现;

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