One-dimensional confined p-n junction Co3S4/MoS2 interface nanorods significantly enhance polysulfide redox kinetics for Li-S batteries

Authors：Zhou, Wei; Ning, Shunlian; Fan, Bin; Wu, Qikai; Mi, Luo; Zhao, Dengke^*; Zhou, Kai^*; Wang, Nan^*

Source：Journal of Materials Chemistry A, 2023, 11(2): 926-936.

DOI：10.1039/d2ta08665d

• EFFICIENT HYDROGEN-EVOLUTION
• MOS2 NANOSHEETS
• LITHIUM
• ELECTROCATALYST
• NANOBOXES

Exploring MoS2-based sulfur hosts with high performance is an effective strategy for promoting the extensive application of Li-S batteries. Hence, one-dimensional (1D) Co3S4/MoS2 nanorods (n-Co3S4/p-MoS2 NR) have been prepared via a self-sacrificial template method to solve these issues by forming a p-n junction interface. Characterization reveals that the 1D MoO3 templates effectively confine the growth and stacking of MoS2 nanosheets and the p-n junction Co3S4/MoS2 interface increases electron transfer ability in the battery reaction. Furthermore, DFT calculations suggest that the interfaces can reduce the energy barriers of the rate-determining step (RDS) in lithium polysulfide (LiPS) transformation. Consequently, the S@n-Co3S4/p-MoS2 NR cathode exhibits high specific capacity, remarkable rate capability, and outstanding cycling stability with capacity fading of 0.01% per cycle over 1000 cycles. Additionally, under ultrahigh sulfur loading (14.8 mg cm(-2)) and lean electrolyte conditions (E/S = 5 mu L g(-1)), a brilliant areal capacity of 11.3 mA h cm(-2) is retained after 100 cycles at 0.1C. This work provides a new way to prepare complicated MoS2-based nanocomposites for long-life LSBs.

• Institution
  中山大学; 广州大学