Ta₄C₃-Modulated MOF-Derived 3D Crosslinking Network of VO₂(B)@Ta₄C₃ for High-Performance Aqueous Zinc Ion Batteries

Abstract

A two-dimensional MXene (Ta4C3) was innovatively used herein to modulate the space group and electronic properties of vanadium oxides, and the MXene/metal–organic framework (MOF) derivative VO2(B)@Ta4C3 with 3D network cross-linking was prepared, which was then employed as a cathode to improve the performance of aqueous zinc ion batteries (ZIBs). A novel method combining HCl/LiF and hydrothermal treatments was used to etch Ta4AlC3 to obtain a large amount of accordion-like Ta4C3, and the V-MOF was then hydrothermally grown on the surface of the stripped Ta4C3 MXene. During the annealing process of V-MOF@Ta4C3, the addition of Ta4C3 MXene liberates the V-MOF from agglomerative stacking, allowing it to show additional active sites. More significantly, Ta4C3 prevents the V-MOF in the composite structure from converting into V2O5 of space group Pmmn but into VO2(B) of space group C2/m after annealing. A considerable advantage of VO2(B) for Zn2+ intercalation is provided by the negligible structural transformation during the intercalation process and the special tunnel transport channels, which have an enormous area (0.82 nm2 along the b axis). According to first-principles calculations, there is a strong interfacial interaction between VO2(B) and Ta4C3, which deliver remarkable electrochemical activity and kinetic performances for the storage of Zn2+. Therefore, the ZIBs prepared with the VO2(B)@Ta4C3 cathode material exhibit an ultra-high capacity of 437 mA h·g–1 at 0.1 A·g–1 while showing good cycle performance and dynamic performance. This study will offer a fresh approach and a reference for creating metal oxide/MXene composite structures.

Ta4C3 Nanosheet/Melamine Sponges with High Sensitivity and Long-Term Stability for Wearable Piezoresistive Sensors

“…38 After etching and intercalation, the intensity of the Ta 4 C 3 peak decreases and the (002) peak shifts to a lower angle of 6.60°, consistent with previously reported results. 36,38 The broad diffraction peak at ∼23.0°suggests the amorphous structure of the melamine sponge. 39 The XRD pattern of the Ta 4 C 3 nanosheet/melamine sponge is similar to that of Ta 4 C 3 , confirming the successful integration between the Ta 4 C 3 nanosheet and the sponge.…”

“…The deconvoluted spectra of Ta 4f in Figure 3c display characteristic peaks at 25.68 and 27.59 eV, representing the binding energies of Ta 4f 7/2 and Ta 4f 5/2 , respectively. 36,42 As shown in Figure 4a, the Ta 4 C 3 nanosheet/melamine sponge can recover its original shape after being compressed, demonstrating its exceptional mechanical compressibility and elasticity. Figure 4b demonstrates that all stress−strain curves exhibit closed hysteresis loops, which are common characteristics of sponges.…”

“…Finally, the Ta 4 C 3 nanosheet demonstrates better stability in air compared to other MXene nanomaterials, resulting in prolonged sensor lifespan and improved suitability for various environments . These characteristics make Ta 4 C 3 a versatile material with significant potential for various applications. , However, there is limited research on the utilization of Ta 4 C 3 nanosheets for wearable piezoresistive sensors.…”

“…34 These characteristics make Ta 4 C 3 a versatile material with significant potential for various applications. 35,36 However, there is limited research on the utilization of Ta 4 C 3 nanosheets for wearable piezoresistive sensors.…”

A flower‐like VO2(B)/V2CTx heterojunction as high kinetic rechargeable anode for sodium‐ion batteries

“…8 Therefore, simple synthesis method, tailored nanoarchitecture design and additional surface engineering may facilitate industrialization. 9 So far, various nanostructures of VO 2 (B), such as nanorods, 10 nanoneedles, 11 nanobelts, 8 nanospheres, 12,13 nanofibers, 14 nanosheets, 15 and 3D grid structure 16 have been synthesized to obtain advanced electrochemical properties. These novel structures not only can provide adequate spaces for relieving volume deformation, but also construct rich interfaces to enhance ion transport.…”