Hierarchical MXene/transition metal oxide heterostructures for rechargeable batteries, capacitors, and capacitive deionization

Abstract

2D MXenes have attracted considerable attention due to their high electronic conductivity, tunable metal compositions, functional termination groups, low ion diffusion barriers, and abundant active sites. However, MXenes suffer from...

Constructing MXene hydrogels and aerogels for rechargeable supercapacitors and batteries

“…50 In general, the synthesis strategies of the MXene sheets mainly include HF acid etching, alkali etching, F-free molten salt etching, electrochemical exfoliation, and other etching methods. [51][52][53][54][55][56][57][58][59] The synthesis method of MXenes can affect their surface properties and electrochemical performance, which can provide more options for subsequent assembly and utilization.…”

Recent Advances in Titanium Carbide MXene (Ti3C2Tx) Cathode Material for Lithium–Air Battery

“…Lithium–air battery is still limited to the laboratory due to its poor cycling property, high overpotential, serious capacity fading, terrible rate capability, and sluggish half-reactions, namely, oxygen reduction (ORR) and oxygen evolution (OER) reactions. ,, Over the years, many materials have been employed as cathodes in nonaqueous Li–air batteries, to obtain high performance but the outcome is still far from commercialization . Due to the success of MXenes, researchers have shifted their focus on employing MXene in Li–air batteries. − Several MXene-based composites such as NiO/Ti 3 C 2 , CoO/Ti 3 C 2 T x , and TiO 2 /Ti 3 C 2 T x have been employed in the lithium–O 2 batteries before and has been known to possess excellent activity. For instance, as a Li–O 2 battery cathode catalyst, NiO/Ti 3 C 2 nanomaterials gave forth a huge initial capacity of 13350 mAh g –1 and a stable performance for over 90 cycles at current densities of 100and 500 mA g –1 , respectively, Figure .…”

Preclinical safety assessment of red emissive gold nanocluster conjugated crumpled MXene nanosheets: a dynamic duo for image-guided photothermal therapy

“…22,23 MXenes are a group of two-dimensional (2D) transition-metal carbides and nitrides synthesized from the MAX phase where M is a transition metal (Ti, Ta, Nb, V, and Mo), A represents a group 13 or 14 element (Al, Si, Ge, Sn, S, As, P, In, Ga, Tl, and Pb) and X is C or N. The general chemical formula of MXenes is M n+1 X n T x (n = 1, 2, 3) where T x represents surface termination groups such as -OH, vO, and -F. [24][25][26] MXenes have shown considerable promise in a variety of fields, including energy, batteries, supercapacitors, photocatalysis, and environmental remediation. [27][28][29][30] Owing to their low cytotoxicity, unique optical properties, and easy bulk synthesis, MXene nanosheets are also gaining popularity in biological applications, 31 particularly in regenerative medicine, antibacterial and anticancer therapies, and bio-imaging, although they are still in early stages. 32,33 The prominent challenges faced by pristine MXene nanosheets are oxidation, reduced surface area, and instability caused by their undesired self-restacking and aggregation.…”

“…24–26 MXenes have shown considerable promise in a variety of fields, including energy, batteries, supercapacitors, photocatalysis, and environmental remediation. 27–30 Owing to their low cytotoxicity, unique optical properties, and easy bulk synthesis, MXene nanosheets are also gaining popularity in biological applications, 31 particularly in regenerative medicine, antibacterial and anticancer therapies, and bio-imaging, although they are still in early stages. 32,33 The prominent challenges faced by pristine MXene nanosheets are oxidation, reduced surface area, and instability caused by their undesired self-restacking and aggregation.…”