We have prepared hollow cobalt sulfide (CoS) hexagonal nanosheets (HNSs) from Co(NO3)2 and thioacetamide in the presence of poly(vinylpyrrolidone) (PVP) at 100°C under alkaline condition. The as-prepared hollow CoS HNSs have an average edge length ca. 110±27nm and an outer shell of 16±4nm in thickness from 500 counts. The CoS HNSs are deposited onto transparent fluorine-doped tin oxide (FTO) substrates through a drop-dry process to prepare two types of supercapacitors (SCs); high rate and large per-area capacitance. The electrolyte used in this study is KOH(aq). The CoS HNSs (8μgcm−2) electrodes exhibit excellent capacity properties, including high energy density (13.2hkg−1), power density (17.5kWkg−1), energy deliverable efficiency (81.3–85.3%), and stable cycle life (over 10,000 cycles) at a high discharge current density of 64.6Ag−1. With their fast charging and discharging rates (<3s), the CoS HNSs show characteristics of high-rate SCs. The CoS HNS SCs having high mass loading (9.7mgcm−2) provide high per-area capacitance of 1.35Fcm−2 and per-mass capacitance of 138Fg−1, respectively, showing characteristics of SCs with large per-area capacitance. Our results have demonstrated the potential of the CoS HNS electrodes hold great practical potential in many fields such as automobile and computer industries.