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首页> 外文期刊>Advanced energy materials >Capture and Catalytic Conversion of Polysulfides by In Situ Built TiO_2-MXene Heterostructures for Lithium–Sulfur Batteries
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Capture and Catalytic Conversion of Polysulfides by In Situ Built TiO_2-MXene Heterostructures for Lithium–Sulfur Batteries

机译：锂硫电池原位构建的TiO_2-MXene异质结构捕获并催化转化多硫化物

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摘要

The detrimental shuttle effect in lithium-sulfur batteries mainly results from the mobility of soluble polysulfide intermediates and their sluggish conversion kinetics. Herein, presented is a multifunctional catalyst with the merits of strong polysulfides adsorption ability, superior polysulfides conversion activity, high specific surface area, and electron conductivity by in situ crafting of the TiO2-MXene (Ti3C2Tx) heterostructures. The uniformly distributed TiO2 on MXene sheets act as capturing centers to immobilize polysulfides, the hetero-interface ensures rapid diffusion of anchored polysulfides from TiO2 to MXene, and the oxygen-terminated MXene surface is endowed with high catalytic activity toward polysulfide conversion. The improved lithium-sulfur batteries deliver 800 mAh g(-1) at 2 C and an ultralow capacity decay of 0.028% per cycle over 1000 cycles at 2 C. Even with a high sulfur loading of 5.1 mg cm(-2), the capacity retention of 93% after 200 cycles is still maintained. This work sheds new insights into the design of high-performance catalysts with manipulated chemical components and tailored surface chemistry to regulate polysulfides in Li-S batteries.
机译：锂硫电池中有害的穿梭效应主要是由于可溶性多硫化物中间体的迁移率及其缓慢的转化动力学所致。本文中，提出了一种通过原位制备TiO 2 -MXene（Ti 3 C 2 T x）异质结构而具有强多硫化物吸附能力，优异的多硫化物转化活性，高比表面积和电子传导性的优点的多功能催化剂。 MXene板上均匀分布的TiO2充当捕获中心以固定多硫化物，异质界面确保锚定的多硫化物从TiO2迅速扩散到MXene，并且氧封端的MXene表面具有对多硫化物转化的高催化活性。改进后的锂硫电池在2 C时可提供800 mAh g（-1），在2 C时经过1000次循环后，每循环的超低容量衰减为0.028％。即使在5.1 mg cm（-2）的高硫负载下， 200个循环后仍保持93％的容量保持率。这项工作为高性能催化剂的设计提供了新的见解，该催化剂具有可操纵的化学成分和定制的表面化学，可调节Li-S电池中的多硫化物。

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  • 来源
    《Advanced energy materials》 |2019年第19期|1900219.1-1900219.9|共9页
  • 作者

    Jiao Long; Zhang Chen; Geng Chuannan; Wu Shichao; Li Huan; Lv Wei; Tao Ying; Chen Zijin; Zhou Guangmin; Li Jia; Ling Guowei; Wan Ying; Yang Quan-Hong;

  • 作者单位

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300072, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China;

    Tianjin Univ, Sch Marine Sci & Technol, Tianjin 300072, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300072, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300072, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300072, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China;

    Tsinghua Univ, Grad Sch Shenzhen, Shenzhen Key Lab Graphene Based Mat, Shenzhen 518055, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300072, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China;

    Tsinghua Univ, Grad Sch Shenzhen, Shenzhen Key Lab Graphene Based Mat, Shenzhen 518055, Peoples R China;

    Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA;

    Tsinghua Univ, Grad Sch Shenzhen, Shenzhen Key Lab Graphene Based Mat, Shenzhen 518055, Peoples R China;

    Tianjin Univ, Sch Marine Sci & Technol, Tianjin 300072, Peoples R China;

    Shanghai Normal Univ, Key Lab Resource Chem Minist Educ, Shanghai Key Lab Rare Earth Funct Mat, Minist Educ, Shanghai 200234, Peoples R China|Shanghai Normal Univ, Dept Chem, Shanghai 200234, Peoples R China;

    Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300072, Peoples R China|Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    catalytic conversion; lithium-sulfur batteries; polysulfides shuttling; TiO2-MXene heterostructures;

    机译：催化转化锂硫电池多硫化物穿梭TiO2-MXene异质结构;

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