Self-assembly of MXene V2CTx/Ag/rGO layered multiscale structure nanocomposite

Two-dimensional MXene materials exhibit excellent performance in various fields, especially in fuel cells and energy storage due to their two-dimensional atomic thickness topology. However, the MXene material is prone to aggregation, and its defects such as collapse seriously affect its electrochemical performance and severely limit its range of application. In this paper, V2CTx + Ag + rGO composite electrode materials were prepared with classical hydrothermal method. The doping of Ag+ and rGO consumes the negative charge on the surface of V2CTx, prevents the delamination from collapse and stacking overlap, and accelerates the penetration of electrolyte ions. The entry of Ag particles and reduced graphene oxide can provide support sites for the layered structure, widen the interlayer spacing and provide a more active contact area for the electrolyte ions, thus opening up a green channel for ion transport. The entry of rGO plays a bridging role in making the contact between Ag particles, rGO and V2CTx closer and the cross-border transport of carriers more convenient. With the incorporation of rGO and Ag particles, the capacitance contribution rate of V2CTx + Ag + rGO composite can reach 63% while the transfer charge resistance is only 17.5 Ω, and the specific capacitance decreases very little with the increase of scanning time. The reason for this is that the rGO and Ag particles transform the original two-dimensional structure of V2CTx into a sandwich structure, which gives the V2CTx + Ag + rGO composite excellent electrical conductivity. The rGO and Ag particles synergize with each other to build an excellent conductive three-dimensional network that accelerates the transfer of ions and charges, resulting in excellent electrochemical performance of the V2CTx + Ag + rGO composite electrode material.