界面内置电场和交联通路使WS2/Ti3C2Tx异质结在低温下具有强大的钠储存能力

IF 14 1区 化学 Q1 CHEMISTRY, APPLIED
Jiabao Li , Shaocong Tang , Jingjing Hao , Quan Yuan , Tianyi Wang , Likun Pan , Jinliang Li , Shenbo Yang , Chengyin Wang
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引用次数: 0

摘要

通过创建高性能异质结并了解其在原子/分子水平上的界面相互作用,为钠离子电池(sib)开发高效的能量存储具有希望,但也具有挑战性。此外,低温条件下反应动力学迟缓限制了sib在寒冷气候下的运行。本文建立了具有内置电场(BIEF)的WS2/Ti3C2Tx异质结的交联纳米结构,并以此为模型揭示了异质结设计和BIEF对改变反应动力学和电化学活性的积极影响。理论分析表明,功函数的差异导致电子从富电子的Ti3C2Tx流向层状的WS2,在非均相界面处自发形成BIEF和“离子库”。此外,交联途径的产生进一步促进了电子/离子的传递,保证了快速的扩散动力学和良好的结构耦合。因此,WS2/Ti3C2Tx异质结获得了优异的钠存储性能,在5.0 A g - 1(25°C)下,高达1000次循环,每个周期只有0.2%的衰减,即使在- 20°C下,也具有293.5 mA h g - 1(100次循环后0.1 A g - 1)的高容量。重要的是,在异质结中自发形成的BIEF,伴随着“离子库”,提供了对制备的结构和获得的性能之间相关性的深刻理解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Interfacial built-in electric field and crosslinking pathways enabling WS2/Ti3C2Tx heterojunction with robust sodium storage at low temperature

Interfacial built-in electric field and crosslinking pathways enabling WS2/Ti3C2Tx heterojunction with robust sodium storage at low temperature

Developing efficient energy storage for sodium-ion batteries (SIBs) by creating high-performance heterojunctions and understanding their interfacial interaction at the atomic/molecular level holds promise but is also challenging. Besides, sluggish reaction kinetics at low temperatures restrict the operation of SIBs in cold climates. Herein, cross-linking nanoarchitectonics of WS2/Ti3C2Tx heterojunction, featuring built-in electric field (BIEF), have been developed, employing as a model to reveal the positive effect of heterojunction design and BIEF for modifying the reaction kinetics and electrochemical activity. Particularly, the theoretical analysis manifests the discrepancy in work functions leads to the electronic flow from the electron-rich Ti3C2Tx to layered WS2, spontaneously forming the BIEF and “ion reservoir” at the heterogeneous interface. Besides, the generation of cross-linking pathways further promotes the transportation of electrons/ions, which guarantees rapid diffusion kinetics and excellent structure coupling. Consequently, superior sodium storage performance is obtained for the WS2/Ti3C2Tx heterojunction, with only 0.2% decay per cycle at 5.0 A g−1 (25 °C) up to 1000 cycles and a high capacity of 293.5 mA h g−1 (0.1 A g−1 after 100 cycles) even at −20 °C. Importantly, the spontaneously formed BIEF, accompanied by “ion reservoir”, in heterojunction provides deep understandings of the correlation between structure fabricated and performance obtained.

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