Preparation of porous organic polymer-derived porous carbon matrix composites and their electrochemical characteristics

Transition metal sulfides are promising supercapacitor electrode materials due to their unique electrochemical characteristics. However, their application in energy storage systems is often limited by issues such as agglomeration and a relatively low specific surface area. This study introduces a novel method using the porous organic polymer MMP as a precursor for creating porous carbon, designated as MMPC. Through high-temperature activation, MMPC was developed. Subsequently, the MMPC@CoS 2 composites were prepared via a one-pot hydrothermal technique, with MMPC serving as the substrate. This research explores the relationships between reaction temperature, the MMPC to CoS 2 ratio, and the electrochemical characteristics of the composites. Results indicated that MMPC@CoS2-160-1.5 composites possessed a higher specific surface area and enhanced microporosity in contrast with pure CoS 2 . The specific capacitance of MMPC@CoS2-160-1.5 reached 1056.6 F g −1 at a current density of 1 A g −1 , with a decrease to only 21.8% at a CD of 10 A g −1 . When configured into MMPC@CoS2-160-1.5//MMPC asymmetric supercapacitors, the composites achieved energy densities of 24.1 and 15.8 Wh kg −1 at power densities of 751 and 7675 W kg −1 , separately, maintaining 83.3% capacitance after 5000 charge–discharge cycles at 2 A g −1 . These findings underscore the potential of the MMPC@CoS2-160-1.5 composite as a supercapacitor electrode material. Graphical abstract