In　this　work,　morphology-tuned　ternary　nickel　cobalt　selenides　based　on　different　Ni/Co　molar　ratios　have　been　synthesized　via　a　simple　precursor　conversion　method　and　used　as　counter　electrode　(CE)　materials　for　dye-sensitized　solar　cells　(DSSCs).　The　experimental　facts　and　mechanism　analysis　clarified　the　possible　growth　process　of　product.　It　can　be　found　that　the　electrochemical　performance　and　structures　of　ternary　nickel　cobalt　selenides　can　be　optimized　by　tuning　the　Ni/Co　molar　ratio.　Benefiting　from　the　unique　morphology　and　tunable　composition,　among　the　as-prepared　metal　selenides,　the　electrochemical　measurements　showed　that　the　ternary　nickel　cobalt　selenides　exhibited　a　more　superior　electrocatalytic　activity　in　comparison　with　binary　Ni　and　Co　selenides.　In　particular,　the　three-dimensional　dandelion-like　Ni0.33Co0.67Se　microspheres　delivered　much　higher　power　conversion　efficiency　(9.01%)　than　that　of　Pt　catalyst　(8.30%)　under　AM　1.5G　irradiation.　©　2016　American　Chemical　Society.