Interfacial coupling metallic MoS2 nanosheets with wrinkled Ti3C2TX MXene for reversible and stable sodium storage

Owing to high electronic conductivity and large interlayer spacing, 1T-MoS2 has attracted remarkable attention as one of the most potential anode materials for sodium-ion batteries. However, the electro-chemical instability seriously hinders its wide application. The high reversible regeneration of Mo-S bonds to pristine 1T-MoS2 inevitably determines electrochemical reversibility of 1T-MoS2. Herein, hi-erarchical 1T-MoS2/MXene architectures demonstrate impressive Na-storage performance with stable reversibility. The theoretical simulation results reveal that the favorable structure of Na-S bonding at Mo/MXene heterointerfaces weakens Na-S bond and thereby decreases the recombination energies of Mo-S bond upon desodiation, greatly promoting reversible Na-storage. Moreover, the ex operando X-ray diffraction and Raman spectra further demonstrate an efficient reversible conversion reaction in 1T-MoS2/MXene anode. Therefore, the heterogenous 1T-MoS2/MXene achieves a considerable perfor-mance as a sodium-ion battery anode material.(c) 2023 Elsevier Ltd. All rights reserved.