Enhanced electrochemical performance of vanadium carbide MXene composites for supercapacitors

Abstract

Two-dimensional (2D) surface-terminated layered transition metal carbide MXenes with high electrochemical performance paved the way for robust energy storage supercapacitor devices. However, because of the 2D nature of the MXene flakes, self-restacking of 2D MXene flakes limits the use of all the flake functionalized surfaces in MXene electrodes. Here, we report the synthesis of V2CT x MXene and multiwall carbon nanotube (MWCNT)/V2CT x composites as a promising electrode material for hybrid energy storage devices. Our hybrid electrodes exhibited enhanced electrochemical performance and a gravimetric capacitance of 1842 F g−1 at a scan rate of 2 mV s−1, with a specific charge capacity of 62.5 A h/g. Moreover, the electrodes presented an excellent rate performance, durability, and retention capacity of 94% lasted up to 10 000 cycles. Density functional theory calculations provided electronic and structural properties of the considered MWCNT@V2CT x. Therefore, the introduction of MWCNTs enhanced the conductivity and reaction kinetics of the MXenes and facilitates the charge storage mechanism useful for next-generation smart energy storage devices.

Enhanced pseudocapacitive energy storage and thermal stability of Sn2+ ion-intercalated molybdenum titanium carbide (Mo2TiC2) MXene

“…The formula used to measure the values of specic capacitance is given in the ESI(SI2 †). 70,71 Fig. 5c shows the plot between log I p and log v to measure the b values for Mo 2 TiC 2 and Sn@Mo 2 TiC 2 , where I p represents the peak current, and v is used for the scan rate (SI3 †).…”

Hydrofluoric Acid-Free Synthesis of Ti3C2Tx MXene Nanostructures for Energy Applications

“…38−40 Based on theoretical calculations, the capacitance of MXene can be varied from 615 to 1116 F/ g. 41,42 Recently, Zahra et al developed a high-conducting MXene network, with the maximum capacitance of 2386 F/g, indicating that the establishment of the conductive network is of importance for supercapacitor application. 43 Herein, we first used bis(trifluoromethanesulfonyl)imide (TFSI) to prepare Ti 3 C 2 T x MXene thin sheets from Ti 3 AlC 2 MAX powder. TFSI has an excellent ability to dissolve "Al" to form an Al-TFSI salt.…”

“…Therefore, researchers manipulated the size and defects of MXene sheets or used binder-free deposition of MXene sheets over conducting substrates to prevent agglomeration. − Based on theoretical calculations, the capacitance of MXene can be varied from 615 to 1116 F/g. , Recently, Zahra et al. developed a high-conducting MXene network, with the maximum capacitance of 2386 F/g, indicating that the establishment of the conductive network is of importance for supercapacitor application …”

Superlattice Stacking by Confinement of the Layered Double Hydroxide/Vanadium Carbide Hybrid Composite. The Effect on Interlayer Anions (SO42– and CO32–) for Comparing the Electrochemical Sensing of a Food Adulterant

“…Fast electron transit and strong electrocatalytic activity are all made possible by these linkages . As a conductive carbon-based substance, VC lends itself well to synergistic effects. , Furthermore, the anion around VC may inhibit particle agglomeration and enhance electrocatalytic activity in the application of electrochemical sensing …”

“…12 As a conductive carbon-based substance, VC lends itself well to synergistic effects. 13,14 Furthermore, the anion around VC may inhibit particle agglomeration and enhance electrocatalytic activity in the application of electrochemical sensing. 15 According to Consumer Reports, ractopamine (RAC) was initially developed as an asthma therapy but was never authorized.…”