MoS 2 ‐Nanosheet‐Decorated 2D Titanium Carbide (MXene) as High‐Performance Anodes for Sodium‐Ion Batteries

Sodium‐ion batteries (SIBs) are a promising alternative to lithium‐ion batteries for large‐scale energy storage applications. The intriguing 2D transition‐metal carbides/carbonitrides, also called MXenes, are increasingly being investigated as anodes as for SIB applications, owing to the merits of their metallic conductivity, low diffusion barrier for Na + , and good mechanical properties. However, the issue of low specific capacity has proven to be a difficult challenge to overcome. Herein, we synthesize a composite of MoS 2 /Ti 3 C 2 T x to improve the ion accessibility of MXene layers by increasing the interlayer space and boost its specific capacity, where the MoS 2 nanosheets are intercalated between Ti 3 C 2 T x layers through a hydrothermal route. When tested as a SIB anode, the MoS 2 /Ti 3 C 2 T x composite yielded a high specific capacity of 250.9 mAh g −1 over 100 cycles. More remarkably, the MoS 2 /Ti 3 C 2 T x electrode displayed an exceeding rate performance with a capacity of 162.7 mAh g −1 at 1 A g −1 .