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首页> 外文期刊>Advanced Functional Materials >Besides the Capacitive and Diffusion Control: Inner-Surface Controlled Bismuth Based Electrode Facilitating Potassium-Ion Energy Storage
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Besides the Capacitive and Diffusion Control: Inner-Surface Controlled Bismuth Based Electrode Facilitating Potassium-Ion Energy Storage

机译：除了电容和扩散控制之外：基于内表面控制的基于电极，便于钾离子能量存储

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摘要

One of the major challenges of potassium-ion hybrid capacitors (PIHCs) is to explore favorable anode materials with fast reaction kinetics to match the cathodes. Here, an "inner-surface" controlled electrochemistry mechanism based on bismuth electrode is proposed and in-depth studied, which is different from the capacitive or diffusion controlled electrode. Such inner-surface controlled electrochemistry performance gives a high K ion diffusion ability under not only room temperature (RT) but also low temperature (LT). In this study, a kind of conjunct-like bismuth nanoparticle (CBN) is fabricated to model such an advantage. The CBN anode for PIBs displays ultra-long cycling stability and excellent rate capability, especially with a reversible capacity of 212.9 mAh g(-1) at 30 A g(-1) after 5000 cycles under RT. At -20 degrees C, the CBN anode achieves a capacity of 191.9 mAh g(-1) at 10 A g(-1) after 10 000 cycles. Coupling with activate carbon cathode, the as-assembled PIHCs deliver high energy/power densities (111.8 Wh kg(-1)/412.8 W kg(-1) and 29 Wh kg(-1)/14 312.6 W kg(-1)), which outperforms those of previously reported PIHCs and other hybrid capacitors. The study provides a new understanding of the energy storage mechanism for bismuth-based electrodes and accelerates the development of advancing potassium ion storage devices, especially at LT.
机译：钾离子混合电容器（PIHCS）的主要挑战之一是利用快速反应动力学探索良好的阳极材料以匹配阴极。这里，提出了基于铋电极的“内表面”控制电化学机构，深入研究，与电容或扩散控制电极不同。这种内表面控制的电化学性能在不仅在室温（RT）之下的高k离子扩散能力，而且提供低温（LT）。在该研究中，制造一种类似物的铋纳米颗粒（CBN）以模拟这种优点。用于PIB的CBN阳极显示出超长循环稳定性和优异的速率能力，特别是在RT的5000次循环后在30Ag（-1）下的可逆容量为212.9mahg（-1）。在-20摄氏度下，CBN阳极在10 000次循环后10Ag（-1）达到191.9mAhg（-1）的容量。与活化碳阴极相结合，组装的PIHCS提供高能/功率密度（111.8WHKG（-1）/412.8W kg（-1）和29 wh kg（-1）/ 14 312.6 w kg（-1） ），这优于先前报告的PIHC和其他混合电容器的那些。该研究提供了对基于铋电极的能量存储机制的新理解，并加速了推进钾离子储存装置的发展，尤其是在LT。

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  • 来源
    《Advanced Functional Materials》 |2021年第27期|2101868.1-2101868.10|共10页
  • 作者

    Liu Miao; Xing Yuqi; Wang Jianwen; Wang Dong; Huang Lu; Wu Xiaoman; Liu Zhixiao; Wu Yingpeng;

  • 作者单位

    Hunan Univ Coll Chem & Chem Engn Adv Catalyt Engn Res Ctr Minist Educ State Key Lab Chem Biosensing & Chemo Changsha 410082 Peoples R China;

    Hunan Univ Coll Chem & Chem Engn Adv Catalyt Engn Res Ctr Minist Educ State Key Lab Chem Biosensing & Chemo Changsha 410082 Peoples R China;

    Hunan Univ Coll Chem & Chem Engn Adv Catalyt Engn Res Ctr Minist Educ State Key Lab Chem Biosensing & Chemo Changsha 410082 Peoples R China;

    Hunan Univ Coll Chem & Chem Engn Adv Catalyt Engn Res Ctr Minist Educ State Key Lab Chem Biosensing & Chemo Changsha 410082 Peoples R China;

    Hunan Univ Coll Chem & Chem Engn Adv Catalyt Engn Res Ctr Minist Educ State Key Lab Chem Biosensing & Chemo Changsha 410082 Peoples R China;

    Hunan Univ Coll Chem & Chem Engn Adv Catalyt Engn Res Ctr Minist Educ State Key Lab Chem Biosensing & Chemo Changsha 410082 Peoples R China;

    Hunan Univ Coll Mat Sci & Engn Changsha 410082 Peoples R China;

    Hunan Univ Coll Chem & Chem Engn Adv Catalyt Engn Res Ctr Minist Educ State Key Lab Chem Biosensing & Chemo Changsha 410082 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    high kinetics; inner-surface controls; low temperature; potassium-ion hybrid capacitors;

    机译：高动力学;内表面控制;低温;钾离子混合电容器;

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