L. Wang, X. Zhang*, Y.N. Xu, C. Li, W.J. Liu, S. Yi, K. Wang, X.Z. Sun, Z.-S. Wu*, Y.W. Ma*
Advanced Functional Materials, 2021, 31, 210428.
DOI: 10.1002/adfm.202104286 [PDF]
Two-dimensional (2D)1T phase MoS2(1T-MoS2) nanosheet with metallic conductivity and expanded interlayer spacing is considered as a highly potential lithium storage electrode material, but remains thermodynamic instability in aqueous media, which seriously hinders its electrochemical performance. Herein, a flexible strategy is proposed for the preparation of thermodynamically stable 1T-MoS2/MXeneheterostructures with the aid of delaminated Ti3C2TxMXene dispersion containing tetrabutylammonium hydroxide (TBAOH). The 2D delaminated Ti3C2Txprovides more uniform nucleation sites for MoS2, andthe TBA+ions can intercalate into MoS2to induce the phase conversion from 2H of semiconducting property to 1T. Moreover, the electrochemical advantages of 1T-MoS2and delaminated Ti3C2Txcan be united by the construction of well-organized heterostructure. Outstanding rate performance is realized because of extra-large interlayer space of 1T MoS2with TBA+intercalation and decreased energy barrier for fast Li+diffusion. Subsequently, a lithium-ion capacitor (LIC) is assembled based on 1T-MoS2/d-Ti3C2Txas anode andhierarchically porous graphene nanocomposite with micro/mesoporous structure as cathode. The LIC exhibits a large energy density up to 188 Wh/kg, ultra-high power density of 13 kW/kg, together with remarkable capacity retention of 83% after 5000 cycles. This work demonstrates great promise of 1T-MoS2/d-Ti3C2Txheterostructures as anode for high performance LICs.
