▎ 摘　　要

NOVELTY - Cobalt nickel disulfide/reduced graphene oxide (RGO) nanohybrid comprises RGO sheets supporting densely packed and uniformly dispersed cobalt-nickel disulfide nanorods having an average length in 85-300 nm preferably 195 nm and diameter 4.2-17.5 nm preferably 8.3 nm. USE - Cobalt nickel disulfide/reduced graphene oxide for dye-sensitized solar cells (DSSCs) that is used for renewable energy harvesting applications. ADVANTAGE - The cobalt-nickel disulfide/reduced graphene oxide has exhibited rich redox property where RGO is having large surface area, good electrical conductivity, easy to make, low-cost, and environment friendly properties, which in turn exhibits excellent performance as a counter electrode, and has high-performance counter electrode material, which has high conductivity and excellent electrocatalytic property, and provides the dye-sensitized solar cell with high solar to electric power conversion efficiency. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) a method for the manufacture of cobalt nickel disulfide/reduced graphene oxide, which involves providing a reaction mixture of graphene oxide (GO) dispersed in ethylene glycol along with source of cobalt and nickel in the presence of sulfur both as donor and reducing agent and subjected to stirring, carrying out controlled hydrothermal reaction such that cobalt-nickel-sulfide species nucleated on solute reduced graphene oxide particles /sheets and allowed to grow as thereon as the cobalt nickel disulfide nanorods; (2) a cobalt nickel disulfide/reduced graphene oxide nanocomposite based counter electrode for Dye Sensitized Solar Cells (DSSCs), which comprises the cobalt nickel disulfide/reduced graphene oxide nanohybrid coating including the cobalt nickel disulfide/reduced graphene oxide nanohybrid including RGO sheets substrate supporting densely packed and uniformly dispersed cobalt nickel disulfide nanorods having average length in the range of 85-300 nm preferably about 195 nm and diameter 4.2-17.5 nm preferably 8.34 nm on a FTO glass having PCE in 6.55-9.22 wt.% preferably 9.22 wt.%; and (3) a method for manufacture of cobalt nickel disulfide/reduced graphene oxide nanocomposite-based counter electrode for Dye Sensitized Solar Cells (DSSCs), providing cobalt nickel disulfide/reduced graphene oxide nanohybrid involving a reaction mixture of graphene oxide dispersed in ethylene glycol along with the sources of cobalt and nickel in the presence of sulfur donor-cum-reducing agent and subjecting to stirring and carrying out controlled hydrothermal reaction such that Co-Ni-S species nucleated on solute (RGO) particles/sheets and allowed to grow as thereon as the cobalt nickel disulfide nanorods, grinding mix of thus obtained cobalt nickel disulfide/reduced graphene oxide nanohybrid in 70-80 wt.% preferably 80 wt.% acetylene black 10-15 wt.% preferably 10 wt.% and polyvinylidene fluoride (PVDF) 10-15 wt.% preferably 10 wt.%, mixing with N-methyl-2-pyrrolidone (NMP) providing a slurry, depositing the thus obtained slurry on FTO glass to make a uniform film involving spin coating at 2500-4000rpm preferably 4000 rpm and drying in air at 85-110 degrees C preferably 100 degrees C.