Background:　Excessive　use　of　fossil　energy　has　exacerbated　global　warming,　and　the　goal　of　carbon　neutralization　has　been　put　on　the　agenda.　In　order　to　make　full　use　of　renewable　energy　and　reduce　greenhouse　gas　emissions,　it　is　urgent　to　develop　environment-friendly　energy　storage　devices.　We　previously　reported　metal　sul-fides/graphene　nanocomposites　for　the　applications　in　supercapacitors　(I.　NiS/graphene).　Recent　work　was　presented　as　the　paper　in　the　series　(II.　Ni-Mn-S/Mn-Cu-O/graphene).　Objective:　To　synthesize　graphene-supported　multi-metal　sulfides　for　electrochemical　capacitance　storage.　Methods:　The　materials　were　prepared　with　a　two-step　hydrothermal　method.　Samples　were　characterized　by　field　emission　scanning　electron　microscopy,　X-ray　powder　dif-fraction,　and　electrochemical　measurements.　Results:　The　as-fabricated　electrode　exhibited　a　specific　capacitance　of　566　F　g–1　at　the　current　density　of　1　A　g–1　and　a　rate　of　68%　at　10　A　g–1　.　The　materials　retained　75.8%　of　the　initial　capacitance　after　1000　charge-discharge　cycles　at　5　A　g–1　.　The　results　suggest　optimum　Ni-Mn-S/Mn-Cu-O/graphene　composites　for　supercapacitor　applications.　Conclusion:　The　Ni-Mn-S/Mn-Cu-O/graphene　composites　with　nanosheet　structures　were　prepared　with　a　two-step　hydrothermal　method.　The　materials　showed　enhanced　electrochemical　capacitance　performances　superior　to　the　individual　components.　©　2022　Bentham　Science　Publishers.