Pt-Based Ternary Intermetallic Nanostructures Advancing the Next Wave in Fuel Cell Electrocatalysts

systems combining two transition metals (TMs) and (2) Pt-TM-pM systems comprising a TM and a p-block metal (pM). Additionally, we discuss Pt-TM-X systems involving interstitial elements (X) and Pt-based high-entropy intermetallic structures. Under this classification, we systematically compare the activity, durability, and ordering degree of ternary Pt-based intermetallic catalysts, highlighting the superiority of ternary compositions over binary analogs. Finally, we conclude this Perspective by outlining future directions for advancing Pt-based ternary intermetallic catalysts.