Interlayer-Expanded MoS₂ Nanoflowers Vertically Aligned on MXene@Dual-Phased TiO₂ as High-Performance Anode for Sodium-Ion Batteries

Abstract

As a promising energy-storage and conversion anode material for high-power sodium-ion batteries operated at room temperature, the practical application of layered molybdenum disulfide (MoS2) is hindered by volumetric expansion during cycling. To address this issue, a rational design of MoS2 with enlarged lattice spacing aligned vertically on hierarchically porous Ti3C2T x MXene nanosheets with partially oxidized rutile and anatase dual-phased TiO2 (MoS2@MXene@D-TiO2) composites via one-step hydrothermal method without following anneal process is reported. This unique “plane-to-surface” structure accomplishes hindering MoS2 from aggregating and restacking, enabling sufficient electrode/electrolyte interaction simultaneously. Meanwhile, the heterogeneous structure among dual-phased TiO2, MoS2, and MXene could constitute a built-in electric field, promoting high Na+ transportation. As a result, the as-constructed 3D MoS2@MXene@D-TiO2 heterostructure delivers admirable high-rate reversible capacity (359.6 mAh g–1 up to 5 A g–1) at room temperature, excellent cycling stability (about 200 mAh g–1) at a low temperature of −30 °C, and superior electrochemical performance in Na+ full batteries by coupling with a Na3V2(PO4)3 cathode. This ingenious design is clean and facile to inspire the potential of advanced low-dimensional heterogeneous structure electrode materials in the application of high-performance sodium-ion batteries.

In Situ Growth Engineering on 2D MXenes for Next‐Generation Rechargeable Batteries

“…To address the volume change, low electrical conductivity, and inevitable aggregation of MoS 2 anode in SIBs, Zhang and co‐workers designed a heterostructure of interlayer‐expanded MoS 2 nanoflowers vertically aligned on MXene@dual‐phase TiO 2 (MoS 2 @MXene@D‐TiO 2 ) (Figure 12f). [ 131 ] They first prepared Ti 3 C 2 T x MXene nanosheets by an acid (LiF + HCl) etching method. Then Na 2 MoO 4 ·2H 2 O, CH 3 CSNH 2 , and CTAB were dispersed in Ti 3 C 2 T x suspension.…”

“…f ) Schematic showing the fabrication process of MoS 2 @MXene@D-TiO 2 . Reproduced with permission [131]. Copyright 2022, American Chemical Society.…”

High‐power and low‐cost sodium‐ion batteries with a wide operation temperature from −70 °C to 130 °C

“…Moreover, to integrate the intermittent renewables into the electric grid, the SIBs with high power and low cost are highly demanded 25 . In addition, the electrochemical performance of SIBs including capacity, efficiency, and energy/power density will deteriorate obviously when the temperature decreases/increases 26–28 . Accordingly, the wide‐temperature operation of SIBs is essential for satisfying the demand for practical applications in extreme weather and different regions (e.g., high‐altitude and tropical zones) 29,30 .…”

Heterojunction Engineering Enhanced Self‐Polarization of PVDF/CsPbBr3/Ti3C2Tx Composite Fiber for Ultra‐High Voltage Piezoelectric Nanogenerator

“…The as‐constructed MoS 2 @MXene@D‐TiO 2 heterostructure in sodium‐ion batteries delivers admirable high‐rate reversible capacity due to the built‐in electric field between the non‐homogeneous phases that promotes the high Na + transportation. [ 23 ] Meanwhile, Agresti et al suggested that the formation of heterojunctions between MXene and perovskite could regulate the arrangement of dipole moments. [ 24 ] Therefore, the construction of MXene heterojunction with perovskite is expected to improve both the arrangement of dipole moments and the utilization of polarized charges.…”