2D/2D 1T‐MoS₂/Ti₃C₂ MXene Heterostructure with Excellent Supercapacitor Performance

Abstract

2D/2D heterostructures can combine the collective advantages of each 2D material and even show improved properties from synergistic effects. 2D Transition metal carbide Ti 3 C 2 MXene and 2D 1T-MoS 2 have emerged as attractive prototypes in electrochemistry due to their rich properties. Construction of these two 2D materials, as well as investigation about synergistic effects, is absent due to the instability of 1T-MoS 2 . Here, 3D interconnected networks of 1T-MoS 2 /Ti 3 C 2 MXene heterostructure are constructed by magneto-hydrothermal synthesis, and the electrochemical storage mechanisms are investigated. Improved extra capacitance is observed due to enlarged ion storage space from a synergistically interplayed effect in 3D interconnected networks. Outstanding rate performance is realized because of ultrafast electron transport originating from Ti 3 C 2 MXene. This work provides an archetype to realize excellent electrochemical properties in 2D/2D heterostructures.

A High‐Performance, Tailorable, Wearable, and Foldable Solid‐State Supercapacitor Enabled by Arranging Pseudocapacitive Groups and MXene Flakes on Textile Electrode Surface

“…Benefiting from the high areal capacitance performance and extended operating voltage window, the solid‐state asymmetric device can deliver a maximum areal energy density up to 277.3 μWh cm −2 at a power density of 624 μW cm −2 (Figure 5e). The obtained areal energy density outperforms those of ever‐reported MXene‐based symmetric and asymmetric supercapacitors including RuO 2 //Ti 3 C 2 yarn (1.5 V; 168 μWh cm −2 ), [ 47 ] PANI//Ti 3 C 2 T x (1.4 V; 159 μWh cm −2 ), [ 44 ] Ti 3 C 2 aerogel//CNF (1.3 V; 120 μWh cm −2 ), [ 48 ] RuO 2 //Ti 3 C 2 sandwich (1.5 V; 48 μWh cm −2 ), [ 34 ] 1TMoS 2 /Ti 3 C 2 (0.6 V; 17.4 μWh cm −2 ), [ 49 ] MXene/MPEs (0.6 V; 20.4 μWh cm −2 ) [ 42 ] and these in Table S1, Supporting Information, which is also remarkably outstanding in many textile‐based supercapacitors such as activated graphene fiber fabric (0.8 V; 23.5 μWh cm −2 ), [ 50 ] VS4‐CC@VS‐3 (2.0 V; 74.4 μWh cm −2 ), [ 51 ] activated carbon cloth (1.0 V; 77 μWh cm −2 ), [ 15 ] CF/MoO 3 //CF/MnO 2 (2.0 V; 2.7 μWh cm −2 ), [ 52 ] Co 9 S 8 @PPy@NiCo‐LDH‐NTAs//AC (1.6 V, 132 μWh cm −2 ), [ 53 ] Cu(OH) 2 /CPCC//AC/CC (1.2 V, 49 μWh cm −2 ) [ 54 ] and these in Table S2, Supporting Information. Even at the highest power density of 26 480 μW cm −2 , the solid‐state asymmetric device can achieve a high areal energy density of 117.7 μWh cm −2 , indicative of outstanding rate capability.…”

Enhanced Rate Capability of Ion‐Accessible Ti3C2Tx‐NbN Hybrid Electrodes

“…[ 1–6 ] Because of high power density, long cycle life, and superior rate capability, supercapacitors (SCs) have attracted increased attention. [ 7–12 ] SCs can provide power density in excess of 10 kW kg −1 since charges are stored through highly reversible ion adsorption or fast redox reactions (in the case of pseudocapacitors), which is at least ten times higher than commercially available lithium‐ion batteries. [ 13–16 ] This meets the requirements of the applications where high‐rate charge/discharge is demanded, which include but are not limited to energy harvesting/recapturing and delivery in electric vehicles, elevators, trains, smart grids, and backup power for electronics, electric utilities, and factories.…”

Recent Advances in Functional 2D MXene‐Based Nanostructures for Next‐Generation Devices

“…Compared with pristine 2D MXene, functional 2D MXenes, including surface-modified 2D MXenes and mixed-dimensional 2D MXene-based heterostructures, exhibit remarkably improved performances due to the synergistic effect, which have great potential for next-generation devices in versatile fields. [65,74,[153][154][155][156][157][158] Investigations on the performances of functional 2D MXenes play an important role in understanding the structure-property relationships and functional 2D MXenerelated applications. In this section, the related applications (energy storage and conversion, catalysis, sensors, photodetectors, EMI shielding, and biomedical applications) of functional 2D MXenes are discussed in detail.…”