Constructing MoO2/Mo2C heterointerfaces on N-doped carbon microspheres for synergistic adsorption-catalysis of
Lin Sun1, Tianqi Wang1, Jie Xie2
1School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China.
Abstract:
The practical implementation of lithium‑sulfur (LiS) batteries is severely hindered by the polysulfide shuttle effect and sluggish conversion kinetics. Herein, we designed and fabricated a heterostructured MoO2/Mo2C composite anchored on N-doped carbon microspheres (MoO2/Mo2C@NC) as a multifunctional separator coating. The built-in electric field formed at the MoO2/Mo2C interface drives electron redistribution, which not only strengthens the chemical anchoring of polysulfides on the polar MoO2 surfaces but also accelerates their catalytic conversion on the conductive Mo2C domains. This synergistic adsorption-catalysis mechanism effectively suppressed shuttle behavior and enhanced liquid-to-solid transformation kinetics. As a result, LiS batteries equipped with the MoO2/Mo2C@NC-modified separator exhibited remarkable rate capability (670 mAh g-1 at 2C) and long-term cycling stability (approximately 515 mAh g-1 after 1000 cycles). This work elucidates the critical role of interfacial electronic modulation in polysulfide regulation and provides a rational heterostructure design strategy for high-energy-density LiS batteries.
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