Tetrabutylammonium-Intercalated 1T-MoS2 Nanosheets with Expanded Interlayer Spacing Vertically Coupled on 2D Delaminated MXene for High-Performance Lithium-Ion Capacitors,Advanced Functional Materials

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Tetrabutylammonium-Intercalated 1T-MoS2 Nanosheets with Expanded Interlayer Spacing Vertically Coupled on 2D Delaminated MXene for High-Performance Lithium-Ion Capacitors
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2021-06-24 , DOI: 10.1002/adfm.202104286
Lei Wang _{1,

2} , Xiong Zhang _{1,

2,

3} , Yanan Xu ₁ , Chen Li ₁ , Wenjie Liu _{1,

2} , Sha Yi ₁ , Kai Wang _{1,

2,

3} , Xianzhong Sun ₁ , Zhong‐Shuai Wu _{3,

4} , Yanwei Ma _{1,

2,

5}

Affiliation

2D 1T phase MoS₂ (1T-MoS₂) nanosheet with metallic conductivity and expanded interlayer spacing is considered as a highly potential lithium storage electrode material but remains thermodynamic instability in aqueous media, seriously hindering the electrochemical performance. Herein, a versatile strategy is proposed for the preparation of thermodynamically stable 1T-MoS₂/MXene heterostructures with the aid of delaminated Ti₃C₂T_x MXene (d-Ti₃C₂T_x) dispersion containing tetrabutylammonium hydroxide. The 2D d-Ti₃C₂T_x provides more uniform nucleation sites for MoS₂, and the TBA⁺ ions can intercalate into MoS₂ to induce the phase conversion from semiconducting 2H to 1T. Moreover, the electrochemical advantages of 1T-MoS₂ and d-Ti₃C₂T_x can be united by the construction of a well-organized heterostructure. Outstanding rate performance is realized because of extra-large interlayer space of 1T MoS₂ with TBA⁺ intercalation and decreased energy barrier for fast Li⁺ diffusion. Subsequently, a lithium-ion capacitor (LIC) is assembled based on 1T-MoS₂/d-Ti₃C₂T_x as anode and hierarchically porous graphene nanocomposite with micro/mesoporous structure as a cathode. The LIC exhibits a large energy density up to 188 Wh kg⁻¹, an ultra-high power density of 13 kW kg⁻¹, together with remarkable capacity retention of 83% after 5000 cycles. This study demonstrates the great promise of 1T-MoS₂/d-Ti₃C₂T_x heterostructures as anode for high-performance LICs.

中文翻译：

具有扩展层间距的四丁基铵插层 1T-MoS2 纳米片垂直耦合在 2D 分层 MXene 上，用于高性能锂离子电容器

具有金属导电性和扩大的层间距的二维1T相MoS ₂ (1T-MoS ₂ )纳米片被认为是一种高潜力的锂存储电极材料，但在水介质中仍然存在热力学不稳定性，严重阻碍了电化学性能。在此，提出了一种通用策略，用于借助含有四丁基氢氧化铵的分层 Ti ₃ C ₂ T _x MXene (d-Ti ₃ C ₂ T _x ) 分散体制备热力学稳定的 1T-MoS ₂ /MXene 异质结构。2D d-Ti ₃ C ₂ T _x为 MoS ₂提供了更均匀的成核位点，并且 TBA ⁺离子可以嵌入到 MoS _{2 中}以诱导从半导体 2H 到 1T 的相转变。此外，1T-MoS ₂和d-Ti ₃ C ₂ T _x的电化学优势可以通过构建组织良好的异质结构来结合。由于具有TBA ⁺嵌入的1T MoS ₂的超大层间空间和降低的快速Li ⁺扩散的能垒，实现了出色的倍率性能。随后，基于1T-MoS ₂ /d-Ti ₃组装锂离子电容器（LIC）C ₂ T _x作为阳极，具有微孔/介孔结构的分级多孔石墨烯纳米复合材料作为阴极。LIC表现出高达188 Wh kg ^-1的大能量密度，13 kW kg ^-1的超高功率密度，以及5000次循环后83%的显着容量保持率。这项研究证明了 1T-MoS ₂ /d-Ti ₃ C ₂ T _x异质结构作为高性能 LIC 阳极的巨大前景。

更新日期：2021-06-24

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