Abstract
AbstractAs the main degradation mechanism, carbon corrosion behavior plays an important role to deteriorate the durability and lifetime of PEMFCs. For addressing the issue, we synthesized a novel type of mesoporous PtIr alloy catalyst through the self‐assembled composite micelles made of PS‐b‐P2VP‐b‐PEO triblock copolymer and metal acid ions (PtCl62− and IrCl62−). The strength of large ECSA and high limited current density on PtIr85 : 15 and PtIr75 : 25 catalysts could be attributed to the uniformly ordered mesoporous structure. It is beneficial to the sufficient exposure of reactive sites and the diffusion of reactants and products. The corresponding PtIr/C alloy catalysts were obtained to deposit PtIr alloys on Vulcan XC 72R. After stress cycling, the increase rate of double‐layer capacitance is the slowest on PtIr75 : 25/C and keeps the minimum values. Moreover, the increase speed of Q/HQ peak is also associated with the increased Ir content in catalyst. Here, incorporation with Ir atom has been proved as an effective method to protect the carbon corrosion behaviors.
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