J. Mater. Sci. Technol. ›› 2022, Vol. 116: 151-160.DOI: 10.1016/j.jmst.2021.11.026

• Research Article • Previous Articles     Next Articles

Hierarchical Ti3C2Tx@MoS2 heterostructures: A first principles calculation and application in corrosion/wear protection

Meng Caia, Peng Fengb, Han Yanb, Yuting Lib, Shijie Songb, Wen Lib, Hao Lib, Xiaoqiang Fanb,*(), Minhao Zhua,b,*()   

  1. aTribology Research Institute, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China
    bKey Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2021-10-16 Revised:2021-11-30 Accepted:2021-11-30 Published:2022-02-21 Online:2022-07-26
  • Contact: Xiaoqiang Fan,Minhao Zhu
  • About author:zhuminhao@home.swjtu.edu.cn (M. Zhu).
    ∗ Key Laboratory of Advanced Technologies of Materi- als (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China. E-mail addresses: fxq@home.swjtu.edu.cn (X. Fan),

Abstract:

Surface and interface engineering plays a crucial role in modulating the properties of materials, especially two-dimensional (2D) materials. Hence, a strategy, forming heterostructures with MoS2, is proposed to overcome the natural agglomeration of Ti3C2Tx MXene nanosheets. Most importantly, the interactions between Ti3C2Tx and MoS2 were elaborately investigated by first-principles calculations based on density functional theory (DFT) for the first time. The calculations demonstrate that van der Waals forces dominate the interface interactions of Ti3C2Tx and MoS2, rendering Ti3C2Tx@MoS2 heterostructures favorable stability. The Ti3C2Tx@MoS2 heterostructure composites were synthesized through a facile one-step hydrothermal method and exhibit a 2D hierarchical structure. Furthermore, the corrosion and tribological properties of epoxy composite coatings with varying proportions of Ti3C2Tx@MoS2 composites were studied in detail. As a result, the epoxy composite coating with 0.1 wt.% Ti3C2Tx@MoS2 composites (Ti3C2Tx@MoS2-0.1) exhibits excellent corrosion protection and antiwear performances. The Ti3C2Tx@MoS2-0.1 keeps the largest low-frequency impedance modulus (|Z|0.01 Hz) and coating resistance (Rc) during the whole immersion period. Its wear rate is 0.09 μm3/(N μm) under the load of 10 N, one half of that of pure epoxy coating (EP). This work further broadens the application of MXene-based heterostructure composites.

Key words: First-principles calculations, Ti3C2Tx Mxene, MoS2, Heterostructure, Corrosion/wear