Synthesis of S-doped porous carbon/MnO₂composite from discarded medical masks for hybrid supercapacitor electrodes

The fabrication of supercapacitor electrodes can be obtained from materials with abundant carbon availability such as discarded polypropylene medical masks, studied by XRD, SEM, and FTIR. In this work, discarded surgical masks and then carbon was obtained via a solvothermal method. The fabrication of high performance supercapacitor to enhance the electrochemical performance of carbon-based electrode is by combining carbon material with MnO2 to form hybrid supercapacitor electrodes. The electrochemical performance can be greatly improved because of the high electrical conductivity of carbon and excellent redox reaction from MnO2. Fibrous structure of S-doped porous carbon morphology via SEM with nanowire MnO2 covered a rod carbon structure. Furthermore, XRD analysis and FTIR show the amorphous structure with high peak at 2θ 25.5° and 42.2° with the absorption peak at 509.05 cm-1, 510.68 cm-1 and 578. 87 cm-1 shows the Mn-O stretching. The as-prepared 0.3-SDPC/MnO2 exhibited the highest specific capacitance of 84.71 F g-1. Moreover, as-prepared 0.3-SDPC/MnO2 showed high energy and power density (7.53 Wh kg-1, 169.96 W kg-1) and the lowest resistance of 0.72 ω. These results indicate that 0.3-SDPC/MnO2 composite electrode will have potential application in hybrid supercapacitors.