Carbonaceous materials are promising anode candidates for potassium-ion batteries,but currently the unsatisfactory cycling and rate performances due to the sluggish diffusion kinetic and serious structure damage during K+insertion/extraction limit their practical appli-cation.Herein,a series of sulfur-doped porous carbons(SPCs)were prepared via a template-assisted freeze-drying followed by the carbonization and sulfuration processes at different temperatures.Among the three as-synthesized samples,SPC-600 exhibits the highest specific capacity(407 mAh·g-1 at 0.10 A·g-1),the best rate(242 mAh·g-1 at 2.00 A·g-1)and cycling performance(286 mAh·g-1 after 800 cycles at 0.50 A·g-1).All the SPCs display higher capacities than the undoped carbon materials.The excel-lent electrochemical performance of SPC can be ascribed to the abundant three-dimensional porous structure toge-ther with S-doping in the disordered carbon,which is favor of providing adequate reaction active sites as well as fast ion/electron transport paths.The density functional theory(DFT)calculations further demonstrate that the sulfur-doping can promote K-ion adsorption and storage.Mean-while,the kinetic analyses reveal that surface-induced capacitive mechanism dominates the K-ion storage process in SPCs,which contributes to ultrafast charge storage.This work provides an effective strategy for fabricating high-performance potassium-ion storage electrode materials.