Expediting Sulfur Reduction/Evolution Reactions with Integrated Electrocatalytic Network: A Comprehensive Kinetic...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium-sulfur batteries (LSBs) show promise for high energy density but suffer from slow reaction kinetics.
• Existing electrocatalysts often exhibit insufficient catalytic capability for crucial sulfur conversion reactions.

Purpose of the Study:

• To develop and evaluate an integrated catalytic network for enhanced sulfur-based species conversion in LSBs.
• To investigate the catalytic activity of GC-uNiCoP@NPC for sulfur reduction and evolution reactions.

Main Methods:

• Synthesis of graphitic carbon-encapsulated/bridged ultrafine NiCoP embedded in N, P-codoped carbon (GC-uNiCoP@NPC).
• Operando kinetic analyses to profile Li-S chemistry evolution.
• Electrochemical performance testing of sulfur cathodes and pouch cells.

Main Results:

• GC-uNiCoP@NPC demonstrated versatile and efficient catalytic activity for sulfur reduction/evolution reactions, particularly heterogeneous phase transitions.
• High capacity and stable cycling were achieved for sulfur cathodes with high areal loading and lean electrolyte.
• Pouch cells assembled under practical conditions exhibited a specific energy of 302 Wh kg⁻¹.

Conclusions:

• The developed GC-uNiCoP@NPC serves as a highly competent catalyst for LSBs.
• This work expands catalyst design strategies for LSBs and provides insights into catalyst performance for Li-S chemistry.