3D V2CTx-rGO Architectures with Optimized Ion Transport Channels toward Fast Lithium-Ion Storage

Two-dimensional (2D) MXene materials show great potential in energy storage devices. However, the self-restacking of MXene nanosheets and the sluggish lithium-ion (Li+) kinetics greatly hinder their rate capability and cycling stability. Herein, we interlink 2D V2CTx MXene nanosheets with rGO to construct a 3D porous V2CTx-rGO composite. X-ray spectroscopy study reveals the close interfacial contact between V2CTx and rGO via electron transfer from V to C atoms. Benefiting from the close combination and optimized ion transport channel, V2CTx-rGO offers a high-rate Li+ storage performance and excellent cycling stability over 2000 cycles with negligible capacity attenuation. Moreover, it exhibits a dominant mechanism of intercalation pseudocapacitance and efficient Li+ transport proved by density functional theory calculation. This rationally designed 3D V2CTx-rGO has implications for the study of the MXene composite's structure and energy storage devices with high rate and stability.

Automated summary

The study interlinks 2D V2CTx MXene nanosheets with rGO to construct a 3D porous V2CTx-rGO composite, which shows improved energy storage performance and stability through close interfacial contact and optimized ion transport channels.