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首页> 外文期刊>Advanced Functional Materials >Boosting Dual-Directional Polysulfide Electrocatalysis via Bimetallic Alloying for Printable Li-S Batteries
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Boosting Dual-Directional Polysulfide Electrocatalysis via Bimetallic Alloying for Printable Li-S Batteries

机译：通过双金属合金化促进双向多硫化物电常放物，用于可印刷LI-S电池

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摘要

The rational design of electrocatalyst has readily stimulated a burgeoning interest in expediting polysulfide conversion and hence essentially restricting the "shuttle effect" in Li-S systems. Nevertheless, seldom efforts have been devoted to probing the dual-directional polysulfide electrocatalysis to date. Herein, a CoFe alloy decorated mesoporous carbon sphere (CoFe-MCS) serving as a promising mediator for Li-S batteries is reported. Such bimetallic alloying boosts dual-directional electrocatalytic activity toward effective polysulfide conversion throughout detailed electroanalytic characterization, theoretical calculation, and operando instrumental probing. Accordingly, the S@CoFe-MCS cathode harvests a stable cycling with a low capacity decay rate of 0.062% per cycle over 500 cycles at 2.0 C. More encouragingly, benefiting from the optimized redox kinetics and delicate grid architecture, printable S@CoFe-MCS cathode achieves an excellent rate performance at a sulfur loading of 4.0 mg cm(-2)and advanced areal capacity of 6.0 mAh cm(-2)at 7.7 mg cm(-2). This work explores non-precious metal alloy electrocatalysts in printable cathodes toward dual-directional polysulfide conversion, holding great potential in the pursuit of Li-S commercialization.
机译：电催化剂的合理设计已经容易地刺激了加速多硫化物转化的蓬勃发展的兴趣，因此基本上限制了LI-S系统中的“梭效果”。然而，迄今为止，很少努力探讨双向多硫化物电催化。在此，报道了一种作为Li-S电池的有前途介质的Cofe合金装饰着介孔碳球（CoFe-MCS）。这种双金属合金化促进了在整个详细的电解质表征，理论计算和操作公司辅助探测的有效多硫化物转化率的双向电催化活性。因此，S @ cofe-MCS阴极收获稳定的循环，其低容量衰减率为每周循环的低容量衰减速率超过500次循环，比2.0℃的500次循环，从优化的氧化还原动力学和精致的网格架构中受益，可打印的s @ cofe- MCS阴极在4.0mg cm（-2）的硫载量下实现优异的速率性能，并且在7.7mg cm（-2）下的6.0mah（-2）的先进的面积容量。这项工作探讨了可印刷阴极中的非贵金属合金电催化剂，朝向双向多硫化物转化，追求Li-S商业化的巨大潜力。

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  • 来源
    《Advanced Functional Materials》 |2021年第4期|2006798.1-2006798.9|共9页
  • 作者

    Shi Zixiong; Sun Zhongti; Cai Jingsheng; Fan Zhaodi; Jin Jia; Wang Menglei; Sun Jingyu;

  • 作者单位

    Soochow Univ Coll Energy Soochow Inst Energy & Mat Innovat SIEMIS Key Lab Adv Carbon Mat & Wearable Energy Technol Suzhou 215006 Peoples R China;

    Soochow Univ Coll Energy Soochow Inst Energy & Mat Innovat SIEMIS Key Lab Adv Carbon Mat & Wearable Energy Technol Suzhou 215006 Peoples R China;

    Soochow Univ Coll Energy Soochow Inst Energy & Mat Innovat SIEMIS Key Lab Adv Carbon Mat & Wearable Energy Technol Suzhou 215006 Peoples R China;

    Soochow Univ Coll Energy Soochow Inst Energy & Mat Innovat SIEMIS Key Lab Adv Carbon Mat & Wearable Energy Technol Suzhou 215006 Peoples R China;

    Soochow Univ Coll Energy Soochow Inst Energy & Mat Innovat SIEMIS Key Lab Adv Carbon Mat & Wearable Energy Technol Suzhou 215006 Peoples R China;

    Soochow Univ Coll Energy Soochow Inst Energy & Mat Innovat SIEMIS Key Lab Adv Carbon Mat & Wearable Energy Technol Suzhou 215006 Peoples R China;

    Soochow Univ Coll Energy Soochow Inst Energy & Mat Innovat SIEMIS Key Lab Adv Carbon Mat & Wearable Energy Technol Suzhou 215006 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    3D printing; CoFe alloys; dual-directional electrocatalytic effect; electrocatalysts; Li-S batteries;

    机译：3D打印;Cofe合金;双向电催化效果;电催化剂;LI-S电池;

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