Sulfur‐Doped Graphene with Iron Pyrite (FeS₂) as an Efficient and Stable Electrocatalyst for the Iodine Reduction Reaction in Dye‐Sensitized Solar Cells

As an alternative to platinum (Pt), hybrid electrocatalysts based on sulfur‐doped graphene with FeS 2 microspheres (SGN‐FeS 2 ) were used as a counter electrode (CE) in dye‐sensitized solar cells (DSSCs). Benefiting from the high conductivity of SGN and excellent electrocatalytic activity of the FeS 2 , the bifunctional hybrid electrocatalyst‐based device displays a power conversion efficiency (PCE) of 8.1%, which is comparable to that (8.3%) of traditional Pt CE‐based DSSC, while also exhibiting excellent stability in ambient conditions. These characteristics, in addition to its low‐cost and facile preparation, make the SGN–FeS 2 hybrid an ideal CE material for DSSCs.