Versatile Interfacial Self-Assembly of Ti₃C₂T_x MXene Based Composites with Enhanced Kinetics for Superior Lithium and Sodium Storage

Abstract

Exploring nanostructured transition-metal sulfide anode materials with excellent electrical conductivity is the key point for high-performance alkali metal ion storage devices. Herein, we propose a powerful bottom-up strategy for the construction of a series of sandwich-structured materials by a rapid interfacial self-assembly approach. Oleylamine could act as a functional reagent to guarantee that the nanomaterials self-assemble with MXene. Benefiting from the small size of Co-NiS nanorods, excellent conductivity of MXene, and sandwiched structure of the composite, the Co-NiS/MXene composite could deliver a high discharge capacity of 911 mAh g–1 at 0.1 A g–1 for lithium-ion storage. After 200 cycles at 0.1 A g–1, a high specific capacity of 1120 mAh g–1 could be still remaining, indicating excellent cycling stability. For sodium-ion storage, the composite exhibits high specific capacity of 541 mAh g–1 at 0.1 A g–1 and excellent rate capability (263 mAh g–1 at 5 A g–1). This work offers a straightforward strategy to design and construct MXene-based anode nanomaterials with sandwiched structure for high-performance alkali metal ion storage and even in other fields.

Co2V2O7@Ti3C2Tx MXene Hollow Structures Synergizing the Merits of Conversion and Intercalation for Efficient Lithium Ion Storage

“…[50][51][52] In O 1s spectrum (Figure 3d), the peak located at 530. [17,53,54] all of above-mentioned XPS results confirmed the successful synthesis of CVO@MXene hybrids and their good thermal stability in nitrogen.…”

Ultrafine Sb Pillared Few-Layered Ti3C2Tx MXenes for Advanced Sodium Storage

“…Particularly, during the annealing process, Sb clusters were formed due to the aggregation of partially intercalated atomic Sb, leading to further increase of the interlayer spacing and reduction of the degree of ordering of Ti 3 C 2 T x . Therefore, the (002) peak of Ti 3 C 2 T x is nearly invisible . The result also indicates the effective suppression of the self-restacking of Ti 3 C 2 T x .…”

“…Therefore, the (002) peak of Ti 3 C 2 T x is nearly invisible. 56 The result also indicates the effective suppression of the self-restacking of Ti 3 C 2 T x . Although possessing a two-dimensional layered structure, f-Ti 3 C 2 T x displays a moderate specific surface area of 40.5 m 2 g −1 according to the isothermal N 2 adsorption/desorption curve (Figure 2c), in contrast to the extremely high specific surface area usually obtained in graphene with similar morphology.…”

Mechanistic Insights into the Structural Modulation of Transition Metal Selenides to Boost Potassium Ion Storage Stability

“…The results show that Mn doping realize the nanometerization of active materials and the nanometerization of materials is beneficial to the increase of capacity. 31,63 The enhanced electrochemical performance of Mn-doped ZnSe is closely related to the prominent conductivity of the introduced Mn atoms, which could be verified by EIS. Based on the profile of Nyquist plots shown in Figure 6a and SI Figure S17, the plot is similar and composed of a depressed semicircle and an inclined line, corresponding to the range of frequencies from high to middle and low, respectively.…”

“…The BET data (SI Figures S1 and S2) shows that the specific surface area significantly increased from 56.64 to 60.80 m 2 g –1 , and the pore size decreased from 8 to 4 nm. The results show that Mn doping realize the nanometerization of active materials and the nanometerization of materials is beneficial to the increase of capacity. , …”