Synthesis of MoS₂@N‐MXene/C Heterogeneous Nanosheets and its Enhanced Pseudocapacitance Effects for NIBs

Abstract Currently, Na‐ion batteries (NIBs) have emerged as a new generation of energy storage devices. However, due to the lack of suitable anode materials, the large‐scale practical application of NIBs is still greatly limited. Therefore, to address this issue, an effective strategy towards an advanced NIBs anode was developed by achieving MoS 2 anchored on nitrogen‐doped MXene nanosheets with carbon coating (shorten as MoS 2 @N‐MXene/C). The structure, surface chemistry state and micromorphology of MoS 2 @N‐MXene/C were carefully analyzed and characterized by XRD, XPS and SEM/TEM, respectively. It was shown that MoS 2 was loaded on N‐MXene to form a heterogeneous nanosheets structure. When applied to the anode of NIBs, MoS 2 @N‐MXene/C delivered ∼189 mAh g −1 at 4 A g −1 and remained at ∼308 mAh g −1 after 300 cycles at 0.5 A g −1 . Moreover, based on the simulation and calculation from CV curves, the enhanced electrochemical performances of MoS 2 @N‐MXene/C was assigned to its high pseudocapacitance‐dominated contribution (84.5 % at a scan rate of 2 mV s −1 ). Therefore, owing to the highly conductive N‐MXene and the actively anchored MoS 2 , MoS 2 @N‐MXene/C could effectively provide efficient channels for charge transfer and ionic diffusion. The presented design strategy may provide a guidance for developing more‐efficient NIBs anode.