The study focuses on optimizing potassium polysulfides (KPSs) for high-performance potassium-sulfur (K-S) batteries, which are promising for energy storage due to their high energy density and low cost. The researchers designed a composite material containing tungsten single atoms (WSA) and tungsten carbide (W2C) to enhance KPS migration and conversion. Through theoretical screening, they created two ligand environments for tungsten in a metal-organic framework, leading to the formation of WSA and W2C nanocrystals during pyrolysis. W2C provides catalytic sites for KPS conversion, while WSA facilitates KPS migration, reducing insulating sulfide accumulation and preventing catalytic poisoning. This approach results in a K-S battery with 89.8% sulfur utilization, superior rate capability (1059 mAh g⁻¹ at 1675 mA g⁻¹), and a long lifespan of 200 cycles at 25 °C. The findings provide valuable insights for future K-S battery development.The study focuses on optimizing potassium polysulfides (KPSs) for high-performance potassium-sulfur (K-S) batteries, which are promising for energy storage due to their high energy density and low cost. The researchers designed a composite material containing tungsten single atoms (WSA) and tungsten carbide (W2C) to enhance KPS migration and conversion. Through theoretical screening, they created two ligand environments for tungsten in a metal-organic framework, leading to the formation of WSA and W2C nanocrystals during pyrolysis. W2C provides catalytic sites for KPS conversion, while WSA facilitates KPS migration, reducing insulating sulfide accumulation and preventing catalytic poisoning. This approach results in a K-S battery with 89.8% sulfur utilization, superior rate capability (1059 mAh g⁻¹ at 1675 mA g⁻¹), and a long lifespan of 200 cycles at 25 °C. The findings provide valuable insights for future K-S battery development.