biostudies-literatureLiu SExcellent Youth Foundation of Anhui Scientific CommitteeUniversity-level key projects of Anhui University of Science and TechnologyInnovation Foundation for Postgraduate of Anhui University of Science and TechnologyNational Natural Science Foundation of ChinaKey Research and Development Program Projects in Anhui ProvinceNational College Students Innovation and Entrepreneurship Training Program10137-10143https://www.ebi.ac.uk/biostudies/studies/S-EPMC8973034biostudies-literatureUnknown7(12)With the demand for carbon dioxide emission reduction, the sustainable conversion of useless biomass into high-value energy storage devices has received excellent scientific and technological attention. The high synthesis cost and low specific capacitance limited the supercapacitor application. Therefore, biomass-derived sulfur-doping porous carbon (SPC) has been synthesized from ulothrix using simple pyrolysis and chemical activation methods. The unique activated carbon material exhibits a high specific surface area (2490 m² g^-1), and the effect of the activator addition ratio was systematically investigated. The optimized SPC-2 displayed a high specific capacitance (324 F g^-1 at 1 A g^-1) and excellent cycling stability (90.6% retention after 50 000 cycles). Furthermore, a symmetric supercapacitor (SSC) based on SPC-2 demonstrated a high energy density (12.9 Wh kg^-1) at an 800 W kg^-1 power density. This work offers a simple, economical, and ecofriendly synthetic strategy of converting widespread, useless biomass waste into high-performance supercapacitor applications.ACS omegaUlothrix-Derived Sulfur-Doped Porous Carbon for High-Performance Symmetric Supercapacitors.PMC8973034S20201036116811872001121720022021CX2090202004h070200261808085J30QN2018103Chen KXue CDong XWu QGao YLiu SfalseUlothrix-Derived Sulfur-Doped Porous Carbon for High-Performance Symmetric Supercapacitors.With the demand for carbon dioxide emission reduction, the sustainable conversion of useless biomass into high-value energy storage devices has received excellent scientific and technological attention. The high synthesis cost and low specific capacitance limited the supercapacitor application. Therefore, biomass-derived sulfur-doping porous carbon (SPC) has been synthesized from ulothrix using simple pyrolysis and chemical activation methods. The unique activated carbon material exhibits a high specific surface area (2490 m² g^-1), and the effect of the activator addition ratio was systematically investigated. The optimized SPC-2 displayed a high specific capacitance (324 F g^-1 at 1 A g^-1) and excellent cycling stability (90.6% retention after 50 000 cycles). Furthermore, a symmetric supercapacitor (SSC) based on SPC-2 demonstrated a high energy density (12.9 Wh kg^-1) at an 800 W kg^-1 power density. This work offers a simple, economical, and ecofriendly synthetic strategy of converting widespread, useless biomass waste into high-performance supercapacitor applications.2022-01-01T00:00:00Z2022 Mar2025-04-19T20:12:55.914Z2025-04-19T20:12:55.914ZS-EPMC89730343538228610.1021/acsomega.1c06253