Fluorine-Modulated MXene-Derived Catalysts for Multiphase Sulfur Conversion in Lithium–Sulfur Battery

IF 26.6 1区 材料科学 Q1 Engineering Nano-Micro Letters Pub Date : 2024-08-12 DOI:10.1007/s40820-024-01482-6
Qinhua Gu, Yiqi Cao, Junnan Chen, Yujie Qi, Zhaofeng Zhai, Ming Lu, Nan Huang, Bingsen Zhang
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Abstract

Highlights

  • By introducing fluorine modulation into MXene, a new MXene-derived material TiOF/Ti3C2 was successfully synthesized with a distinctive three-dimensional structure and a tailored F distribution.

  • In situ characterizations and electrochemical analyses demonstrate that TiOF/Ti3C2 catalysts effectively coupled the multiphase sulfur species conversion processes.

  • The investigations reveal that the theoretical basis of the fluorine catalysis in Li–S batteries originated from Lewis acid–base mechanisms and charge compensation mechanisms.

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用于锂硫电池多相硫转化的氟调制 MXene 衍生催化剂。
氟因其固有的高电负性而具有电荷析出和离子解离能力;因此,大量研究集中于利用氟化物优化固体电解质界面,并为电极提供动态保护,以调节电池的反应和功能性能。然而,穿梭效应和缓慢的氧化还原反应动力学强调了锂硫电池的潜在瓶颈。氟调制是否能调节锂硫化学反应过程?在此,我们通过 NH4F 氟化法构建了具有定制 F 分布的 TiOF/Ti3C2 MXene 纳米带。根据原位表征和电化学分析,F 激活了 Ti 金属原子在连续氧化还原反应中的催化作用。基于路易斯酸碱机制形成的 O-Ti-F 键增加了 Ti 金属位点的正电荷,这有助于吸附多硫化物,提供更多的成核位点,并促进 S-S 键的裂解。这有助于在较低的过电位下沉积 Li2S。此外,由于电荷补偿机制,氟还能捕获 Li2S 溶解产生的电子。氟调制策略有望指导氟基催化剂的构建,并促进多个连续异相催化过程的无缝集成。
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来源期刊
Nano-Micro Letters
Nano-Micro Letters NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
32.60
自引率
4.90%
发文量
981
审稿时长
1.1 months
期刊介绍: Nano-Micro Letters is a peer-reviewed, international, interdisciplinary, and open-access journal published under the SpringerOpen brand. Nano-Micro Letters focuses on the science, experiments, engineering, technologies, and applications of nano- or microscale structures and systems in various fields such as physics, chemistry, biology, material science, and pharmacy.It also explores the expanding interfaces between these fields. Nano-Micro Letters particularly emphasizes the bottom-up approach in the length scale from nano to micro. This approach is crucial for achieving industrial applications in nanotechnology, as it involves the assembly, modification, and control of nanostructures on a microscale.
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