Small Methods: Chemical modulation enhances sodium storage properties of MXene

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      The large-scale application of electrochemical energy storage devices requires the development of new materials for specific applications. Na-ion batteries have a wide range of applications, but the current state-of-the-art anode material, hard carbon, suffers from poor cycling and rate performance. MXene is an emerging two-dimensional material with broad application prospects.

     Recently, Riccardo Ruffo of the Department of Materials Science of the University of Milan published a research paper entitled Enhanced Functional Properties of Ti3C2Tx MXenes as Negative Electrodes in Sodium-Ion Batteries by Chemical Tuning in the well-known academic journal Small Methods. In this paper, the effects of the etching conditions and post-treatment methods of Ti3C2Tx on its performance in Na-ion batteries were studied.

Figure 1. Description of etching conditions and XRD characterization after etching.

Figure 2. Thermogravimetric analysis.

Figure 3. SEM image and pore size analysis.

Figure 4. XPS characterization of different etch processing conditions.

Figure 5. Electrochemical performance test of Ti3C2Tx Na-ion battery with different treatment conditions.

Figure 6. Kinetic analysis of Ti3C2Tx Na-ion battery with different treatment conditions.

Figure 7. XPS test at different charge potentials.

    Considering different etching conditions and heat treatment conditions, four Ti3C2TxMXene samples were prepared from the pristine MAX phase. Different preparation routes will affect the structure, composition, morphology and functional properties of materials.

Literature link:

DOI: 10.1002/smtd.202000314