Ultra-small ZnS enhanced by Fe-N-C for advanced potassium-ion hybrid capacitors: Electronic transfer dynamics and ion adsorption capability
Ultra-small ZnS enhanced by Fe-N-C for advanced potassium-ion hybrid capacitors: Electronic transfer dynamics and ion adsorption capability
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Fe-N-C 增强的超小型 ZnS 用于先进钾离子混合电容器：电子转移动力学和离子吸附能力
DOI：
10.1016/j.nanoen.2022.108065
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发表时间：
2022
期刊：
影响因子：
17.6
通讯作者：
Yifan Dong
中科院分区：
文献类型：
--
作者：
Shuolei Deng;Changgang Li;Wenhao Feng;Yaowen Cao;Xiaocong Tian;Huiting Bi;Shuang Zhou;Ching-Ping Wong;Yifan Dong
金属硫化物由于其丰富的能量储备和良好的理论容量而被认为是钾离子电池（PIB）和混合电容器（PIHC）的潜在阳极候选者。不幸的是，硫化物具有严重的体积膨胀和缓慢的动力学反应，导致不令人满意的电化学性能。在此，我们采用“一石二鸟“的方法制备了内部超小ZnS纳米颗粒核和Fe-N-C壳（ZnS@FeNC），它们表现出优异的K+存储性能。超小ZnS纳米颗粒与Fe-N-C网络之间的协同效应被证实是增强K+储存的起源。Fe-N-C键的存在可以有效地提高ZnS的钾储能性能。更具体地说，Fe-N-C骨架抑制了ZnS纳米颗粒的体积变化，并促进了KFSI电解质的扩散和K+的插入/提取。当用作PIB时，ZnS@FeNC表现出优异的比容量（0.1 A g− 1下为471 mAh g− 1），稳定的循环能力（1 A g−1下每次循环的容量衰减为0.011%）。更重要的是，PIHC器件表现出优异的能量密度（200.5 W kg− 1时为142.88 Wh kg − 1）和优异的功率密度（10025 W kg− 1，保留36.1 Wh kg− 1）与超长寿命（3000次循环后在1 A g− 1下保持88%的容量）的共存。这种KFSI电极的独特结构设计为储能材料提供了不可或缺的指导。
Metal sulfides are considered as potential anode candidates for potassium ion batteries (PIBs) and hybrid capacitors (PIHCs) due to their abundant energy reserves and decent theoretical capacity. Unfortunately, sulfide has severe volume expansion and slow kinetic reactions, resulting in unsatisfactory electrochemical properties. Herein, we have prepared both internal ultra-small ZnS nanoparticle cores and Fe-N-C shells (ZnS@FeNC), which exhibit excellent K+storage properties, by a " kill two birds with one stone " approach. The synergistic effect between the ultra-small ZnS nanoparticles and the Fe-N-C network was verified as the origin of the enhanced K+storage. The presence of the Fe-N-C bond can effectively enhance the potassium energy storage property of ZnS. More specifically, the Fe-N-C backbone alleviates the volume change of ZnS nanoparticles and facilitates the diffusion of KFSI electrolytes and the insertion/extraction of K+. When applied as PIBs, the ZnS@FeNC presents excellent specific capacity (471 mAh g−1under 0.1 A g−1), stable cycling capability (0.011% capacity decay per cycle under 1 A g−1). More importantly, the PIHC devices exhibit the coexistence of excellent energy density (142.88 Wh kg−1at 200.5 W kg−1) and excellent-power density (10025 W kg−1with 36.1 Wh kg−1retained) with ultra-long lifespan (88% capacity retention at 1 A g−1after 3000 cycles). This unique structural design of this KFSI electrode provides indispensable guidance for energy storage materials.