碳涂层内的分层纳米 MoS2 薄片/微米 MXene 层状复合结构，用于快速钠离子存储,Journal of Materials Chemistry A

当前位置： X-MOL 学术 › J. Mater. Chem. A › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

碳涂层内的分层纳米 MoS2 薄片/微米 MXene 层状复合结构，用于快速钠离子存储
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2024-02-07 , DOI: 10.1039/d3ta08010b
Bingjie Wen ₁ , Nizao Kong ₁ , Min Huang ₁ , Liqin Fu ₁ , Yexin Tian ₁ , Zhixiao Liu ₁ , Zhongchao Wang ₁ , Lezhi Yang ₂ , Fei Han ₁

Affiliation

单一的二维材料通常难以满足钠离子电池电极材料的所有性能要求。然而，构建分层异质二维堆叠结构可以有效地结合多种材料的优点，弥补单一元件的不足。这项工作通过构建分层纳米片/微层状复合结构，应用了预插层硫化概念和液相涂层改性。在这种复合材料中，MoS ₂纳米片和V ₂ C MXene层重叠并相互作用，以防止纳米颗粒团聚和微米薄片同时塌陷。MoS ₂ /MXene分级结构夹在超薄致密碳层之间，形成多面导电骨架和双重保护机制。该涂层减少了电解质接触面积并防止多硫化物副产物逸出。因此，所设计的MSVC@C表现出优异的Na ⁺存储容量（ 600次循环后在0.5 A g ^{-1下为612.4 mA hg}^-1）和出色的倍率性能（在10 A g ^{-1下为304.42 mA hg}^-1）。实验结果和理论计算验证了MoS ₂和V ₂ C异质结构由于更好的电子电导率和更低的离子扩散能垒而促进了电化学性能。此外，这种结构优化策略适用于各种MXene客体（例如V ₂ C和Nb ₂ C）来制备各种分级的纳米-微米结构，这些结构有望成为SIBs的二维电极材料，在该领域具有应用前景。未来。

"点击查看英文标题和摘要"

A hierarchical nano-MoS2 flake/micro-MXene lamellar complex structure within a carbon coating for rapid sodium-ion storage

A single two-dimensional material often struggles to satisfy all the performance requirements of electrode materials for sodium-ion batteries. However, constructing a hierarchical heterogeneous two-dimensional stacking structure can effectively combine the advantages of multiple materials and make up for the insufficiency of a single element. This work applied a pre-intercalation–sulphuration concept and liquid-phase coating modification by constructing a hierarchical nano-flake/micro-lamellar complex structure. In this composite material, MoS₂ nanosheets and V₂C MXene layers overlap and interact to prevent nanoparticle agglomeration and micron flakes collapse simultaneously. The MoS₂/MXene hierarchical structure is sandwiched between ultrathin and dense carbon layers to form a multifaceted conductive skeleton and a twofold protection mechanism. The coating reduces the electrolyte contact area and prevents the escape of polysulfide byproducts. Accordingly, the designed MSVC@C demonstrates superior Na⁺ storage capacities (612.4 mA h g⁻¹ at 0.5 A g⁻¹ after 600 cycles) and outstanding rate performance (304.42 mA h g⁻¹ at 10 A g⁻¹). Experimental results and theoretical calculations verify that the MoS₂ and V₂C heterostructure promotes the electrochemical performance owing to the better electronic conductivity and lower ion diffusion energy barrier. Moreover, this structure optimization strategy applies to various MXene guests (e.g., V₂C and Nb₂C) to prepare a variety of hierarchical nano–micro structures that are expected to be promising two-dimensional electrode materials for SIBs with application prospects in the future.

更新日期：2024-02-07

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南