We　present　a　theoretical　study　on　the　potential　thermoelectric　performance　of　antimony　nanoribbons　(SNRs).　Based　on　density　functional　theory　and　the　semiclassical　transport　model,　the　thermoelectric　figure　of　merit　ZT　was　calculated　for　various　Sb　nanoribbon　sizes　and　different　chiralities.　The　results　indicated　that　the　chemical-bond-driven　edge　reconstruction　of　nanoribbons　(denoted　as　SNRs-recon)　eliminated　all　of　the　dangling　bonds　and　passivated　all　of　the　boundary　antimony　atoms　with　3-fold　coordination.　SNRs-recon　are　the　most　energy　favorable　compared　to　the　ribbons　with　unsaturated　edge　atoms.　Semimetal　to　semiconductor　transition　occurred　in　SNRs-recon.　The　band　gap　was　width-dependent　in　armchair　SNRs　(denoted　as　ASNRs-recon),　whereas　it　was　width-independent　in　zigzag　SNRs　(ZSNRs-recon).　After　nanolization　and　reconstruction,　the　TE　properties　of　SNRs　were　enhanced　due　to　higher　Seebeck　coefficient　and　lower　thermal　conductivity.　The　thermoelectric　properties　of　n-doped　ASNRs-recon　and　p-doped　ZSNRs-recon　showed　width-dependent　odd-even　oscillation　and　eventually　resulted　in　ZT　values　of　0.75　and　0.60,　respectively.　Upon　increasing　the　ribbon　width,　ZT　of　n-doped　ASNRs-recon　decreased　and　approached　a　constant　value　of　about　0.85.　However,　n-doped　ZSNRs-recon　exhibited　poor　TE　performance　compared　with　the　others.　Importantly,　the　ZT　value　could　be　optimized　to　as　high　as　1.91　at　300　K,　which　was　larger　than　those　of　Sb-based　bulk　materials　and　100　times　that　of　thin　Sb　films.　These　optimizations　make　the　materials　promising　room-temperature　high-performance　thermoelectric　materials.　Furthermore,　the　proposed　new　concept　of　chemical-bond-driven　edge　reconstruction　may　be　useful　for　many　other　related　systems.　©　The　Royal　Society　of　Chemistry.