Transition　metal　sulfides　(TMSs)　are　one　kind　of　peculiarly　attractive　electrode　materials　for　supercapacitors　(SCs)　due　to　their　high　specific　capacity　and　various　structures.　However,　an　irreversible　structural　damage　leads　to　a　significant　decline　of　the　electrochemical　properties　during　a　long　period　of　the　redox　reactions.　A　suitable　structure　may　improve　the　long　stability.　A　rough　and　porous　nano-dendrite　Zn-Co-S　directly　grown　on　nickel　foam　(Zn-Co-S/NF)　based　on　the　nano-dendritic　Zn-Co　hydroxide　was　prepared　by　a　rapid　ion-exchange　reaction,　and　its　microstructure　and　electrochemical　properties　were　observed　through　SEM,　TEM,　XRD,　XPS,　and　electrochemical　tests.　It　is　shown　that　the　Zn-Co-S　with　the　rough　and　porous　nano-dendritic　structure　was　due　to　the　etching　effect　of　S2−　during　the　ion　exchange　reaction　process.　The　size　of　these　nano-dendrites　was　about　150　nm.　The　rough　and　porous　nano-dendritic　structure　had　a　good　ability　in　resisting　collapse　caused　by　the　solution　erosion.　The　nano-dendrite　of　Zn-Co-S　exhibited　an　outstanding　rate　capability,　relatively　low　charge　transfer　resistance,　and　an　excellent　cycling　stability,　which　originated　from　facilitated　transportation　of　the　electrolyte　ions,　good　electrical　conductivity,　and　buffered　the　volume　changes　due　to　the　unique　rough　and　porous　structure.　An　asymmetric　supercapacitor　was　assembled　with　the　Zn-Co-S/NF　as　the　cathode　and　the　RuO2-ZnO　electrode　as　the　anode　in　3M　KOH　solution.　The　energy　densities　of　46.9　W　h　kg−1　and　24.1　W　h　kg−1　could　be　obtained　when　the　power　density　was　1006.6　W　kg−1　and　8204.2　W　kg−1.　©　2022　Elsevier　Ltd