A　novel　series　of　ternary　compounds,　namely　cobalt　iron　selenide/sulfide　nanocubes,　are　successfully　synthesized　as　counter　electrode　(CE)　materials　for　dye-sensitized　solar　cells　(DSSCs),　which　deliver　excellent　performances.　Homogeneous　cobalt　iron　Prussian-blue-analog　(PBA)　nanocubes　are　prepared　as　the　templates　and　are　subsequently　dealt　with　selenation/sulfidation　processes　via　hydrothermal　methods.　Owing　to　their　unique　morphology,　porous　structure,　high　surface　area,　small　charge　transfer　resistance　and　high　diffusion　coefficient,　the　Co-Fe-Se/S　nanocubes　possess　high　catalytic　activity　and　excellent　conductivity,　which　are　tested　and　verified　by　electrochemical　measurements.　Meanwhile,　cobalt　iron　selenide/sulfide　nanocubes　CEs　achieve　high　efficiencies　of　9.58%　and　9.06%,　respectively,　which　are　both　higher　than　that　of　Pt　CE　(8.16%).　All　these　prominent　merits　make　them　outstanding　and　promising　participants　among　Pt-free　CE　materials　of　DSSCs　with　lower　production　costs　and　higher　power　conversion　efficiency.　©　2017　Elsevier　B.V.