“…synthesized 3D FeSe 2 microspheres as CE for DSSCs, which gave a slightly higher PCE of 8.39% than that of Pt CE based DSSC (8.20%) . Besides, CoS,, Co 3 S 4 , CoS 2 , Ni 3 S 2 , NiS,, Ni 3 S 4 , NiS 2 , MoS 2 , Cu 2 ZnSnS 4 (CZTS), Cu 2 SnS 3 , FeS and NiSe have also been developed as CE in DSSCs, and proved excellent catalytic performance for I 3 − reduction. Nevertheless, commercial application of the aforementioned materials in DSSCs still faces many challenges.…”