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首页> 外文期刊>Advanced Functional Materials >Hollow Molybdate Microspheres as Catalytic Hosts for Enhancing the Electrochemical Performance of Sulfur Cathode under High Sulfur Loading and Lean Electrolyte
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Hollow Molybdate Microspheres as Catalytic Hosts for Enhancing the Electrochemical Performance of Sulfur Cathode under High Sulfur Loading and Lean Electrolyte

机译：中空钼酸盐微球作为催化宿主，用于提高高硫负载和瘦电解质下硫阴极的电化学性能

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摘要

Lithium-sulfur battery possesses a high energy density; however, its application is severely blocked by several bottlenecks, including the serious shuttling behavior and sluggish redox kinetics of sulfur cathode, especially under the condition of high sulfur loading and lean electrolyte. Herein, hollow molybdate (CoMoO4, NiMoO4, and MnMoO4) microspheres are introduced as catalytic hosts to address these issues. The molybdates present a high intrinsic electrocatalytic activity for the conversion of soluble lithium polysulfides, and the unique hollow spherical structure could provide abundant sites and spatial confinement for electrocatalysis and inhibiting shuttling, respectively. Meanwhile, it is demonstrated that the unique adsorption of molybdates toward polysulfides exhibits a "volcano-type" feature with the catalytic performance following the Sabatier principle. The NiMoO4 hollow microspheres with moderate adsorption show the highest electrocatalytic activity, which is favorable for enhancing the electrochemical performance of sulfur cathode. Especially, the S/NiMoO4 composite could achieve a high areal capacity of 7.41 mAh cm(-2) (906.2 mAh g(-1)) under high sulfur loading (8.18 mg cm(-2)) and low electrolyte/sulfur ratio (E/S, 4 mu L mg(-1)). This work offers a new perspective on searching accurate rules for selecting and designing effective host materials in the lithium-sulfur battery.
机译：锂硫电池具有高能量密度;然而，其申请受到几种瓶颈严重阻止，包括严重的穿梭行为和硫磺阴极的氧化还原动力学缓慢，尤其是在高硫加载和瘦电解质的条件下。在此，将中空钼酸盐（COMO 4，NIMOO4和MNMOO4）微球作为催化宿主引入以解决这些问题。钼酸盐呈现了溶于锂多硫化物的转化的高固有电催化活性，并且独特的中空球形结构可以分别为电殖分析和抑制穿梭的空间和空间限制。同时，证明钼酸酯对多硫化物的独特吸附具有“火山型”特征，其具有催化性能之后的达成的原理。具有中等吸附的NIMOO4中空微球显示出最高的电催化活性，这有利于提高硫阴极的电化学性能。特别是，在高硫负载（8.18mg cm（-2））和低电解质/硫比下，S / NIMOO4复合材料可达到7.41mAhcm（-2）（-2）（-2））的高2.41mAh（-2）（906.2mAhg（-1））（ E / s，4 mu l mg（-1））。这项工作提供了一种新的视角，可以在锂 - 硫电池中选择和设计有效主体材料的准确规则。

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  • 来源
    《Advanced Functional Materials》 |2021年第18期|2010693.1-2010693.11|共11页
  • 作者

    Wang Lu; Li Guo-Ran; Liu Sheng; Gao Xue-Ping;

  • 作者单位

    Nankai Univ Sch Mat Sci & Engn Renewable Energy Convers & Storage Ctr Inst New Energy Mat Chem Tianjin 300350 Peoples R China;

    Nankai Univ Sch Mat Sci & Engn Renewable Energy Convers & Storage Ctr Inst New Energy Mat Chem Tianjin 300350 Peoples R China;

    Nankai Univ Sch Mat Sci & Engn Renewable Energy Convers & Storage Ctr Inst New Energy Mat Chem Tianjin 300350 Peoples R China;

    Nankai Univ Sch Mat Sci & Engn Renewable Energy Convers & Storage Ctr Inst New Energy Mat Chem Tianjin 300350 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    adsorption; electrocatalysis; lithium#8211; sulfur batteries; molybdates; sulfur cathodes;

    机译：吸附;电殖分析;锂 - 硫磺电池;钼酸盐;硫阴极;

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