用于锂硫电池多相硫转化的氟调制 MXene 衍生催化剂。

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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引用次数: 0

摘要

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。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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

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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来源期刊

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.