A safe etching route to synthesize highly crystalline Nb2CTx MXene for high performance asymmetric supercapacitor applications

Nb2CT MXene: High capacity and ultra-long cycle capability for lithium-ion battery by regulation of functional groups

“…So far, MXenes have been used in many fields, such as energy storage, photocatalysis and electrocatalysis, hydrogen storage, electromagnetic interference shielding and sewage purification. In particular, the field of energy storage, such as batteries and supercapacitors [14,15], has received more and more attention in recent years. Among MXene materials, more atomic layers in each formula unit have larger molecular mass, which limits its specific capacity.…”

Flexible freestanding all-MXene hybrid films with enhanced capacitive performance for powering a flex sensor

“…[29][30][31][32][33] However, M2XTx MXenes may achieve higher specific capacitance than Ti3C2Tx. 34,35 Theoretical calculation predicted Nb2C to possess superior gravimetric and areal capacitances than Ti3C2. In Nb2C MXene, Nb atomic layers surface of Nb2C can be fully utilized, enabling sufficient redox sites when acting as intercalation pseudocapacitive electrodes.…”

“…However, higher reaction temperature and longer reaction time are often required to etch Nb2AlC MAX by concentrated HF solution, causing that prepared Nb2CTx MXene to have more lattice defects and a smaller nanosheet size. 33,34 As a result, the electrical conductivity of Nb2CTx is relatively lower than Ti3C2Tx, which limits Nb2CTx potential application in high power electrochemical energy storage.…”

Synthesis and recent applications of MXenes with Mo, V or Nb transition metals: a review

“…For the SEM images (Fig. 8a, b), the HF etching method clearly shows a better etching effect than that of the LiF + HCl etching method (Table 5) [31,87]. Although LiF + HCl has been approved as an effective etchant for Ti 3 C 2 T x [20], it may not be suitable for Nb 2 CT x due to the stronger bond energy (Nb-Al) to overcome.…”