Preparation of corn straw-based porous carbon with target pore structure for high-performance electrode materials via a one-step process.

This study presents a cost-effective approach to producing high-performance corn straw-derived porous carbon (CSC) electrodes with a hierarchical pore structure through a simple, one-step activation and templating process. The synthesized CSC achieved a maximum specific surface area of 1394.6 m/g. The specific capacitance reached 254.2F/g at 0.5 A/g, and the capacitance retention was 97.08 % after 15,000 charge-discharge cycles. The assembled supercapacitor demonstrated an energy density of 16.6 Wh/kg at 450 W/kg and successfully powered an LED bulb. The statistical fitting model indicated that the porous properties of CSC could be effectively regulated by adjusting the ratios of activator and template. Additionally, a structure-activity relationship model was developed to predict capacitance. These findings provide a technical strategy for producing low-cost porous carbon and offer important insights for the directed preparation and optimization of porous carbon with targeted performance, supporting its broader application in the energy sector.