The article focuses on the development and application of ultra-low loading IrPt bimetallic coatings on titanium-based porous transport layers (PTL) for proton exchange membrane water electrolyzer (PEMWE) systems. The passivation of Ti-based PTLs due to TiOx formation during extended operation in acidic environments leads to increased cell voltages. By utilizing a sputtering technique to apply the IrPt bimetallic coating, the degradation of Ti-based PTLs is mitigated. The bimetallic coating not only reduces the precious metal loading to extremely low levels but also exhibits exceptional anti-corrosive properties, surpassing single metal Ir and Pt coatings. The stability number was used to analyze the dissolution behavior of the coatings, indicating significantly higher stability for the IrPt-0.08 coating compared to single metal coatings. The enhanced conductive area and improved charge transfer at the catalyst layer/PTL interface led to a PEMWE performance of 1.73 V at 2 A/cm2 using the IrPt-0.08 PTL at 80°C under ambient pressure. This bimetallic coating offers a durable and efficient solution for PTL in PEMWE applications, showing promise for advancing hydrogen energy technologies.