A　three-dimensional　design　composing　of　porous　carbon　matrix　(PCM)　decorated　with　nickel　sulfide　nanoparticles　(denoted　as　NiSx@PCM)　was　fabricated　through　a　one-step　hydrothermal　process,　and　successfully　utilized　as　an　electrode　material　in　high　performance　sodium-ion　batteries　(SIBs)　and　sodium-ion　hybrid　capacitors　(SIHCs).　The　as-prepared　NiSx@PCM　delivered　a　high　reversible　capacity　of　650　mAh　g−1　over　200　cycles　at　0.5　A　g−1,　outstanding　rate　capability　(167　mAh　g−1　at　as　high　as　20　A　g−1),　and　excellent　cycle　performance　(300　mAh　g−1　at　1　A　g−1　after　800　cycles)　in　the　SIBs.　In　addition,　SIHCs　based　on　NiSx@PCM　composite　anodes　and　commercial　activated-carbon　cathodes　behaved　carried　remarkably　high　energy　densities　of　99.3　and　52.2　Wh　kg−1　at　power　densities　of　140　and　4480　W　kg−1,　respectively.　The　significantly　high-performance　enhancement　should　be　attributed　to　the　excellent　electron/ion　transports　within　the　three-dimensional　active　material-carbon　network　during　charging/discharging　with　the　in-situ　growth　of　the　more　conductive　nickel　sulfide　nanoparticles　throughout　the　porous　carbon　matrix.　This　work　presents　a　facile　method　to　synthesize　three-dimensional　carbon　matrix　incorporating　metal　sulfide　nanoparticles,　as　well　as　suggests　new　insights　into　further　advancing　next-generation　high　energy-density/power-density　energy　storage　units　by　combining　the　merits　of　both　batteries　and　supercapacitors.　©　2019