Science Advances

Supplementary Materials

This PDF file includes:

  • Fig. S1. Polarization curves for MEAs containing D521 and ND ionomers with different contents.
  • Fig. S2. Polarization curves and EIS results of MEAs before and after AST in O2.
  • Fig. S3. Polarization curves and tabulated results of MEAs with different ionomer loadings before and after AST in air.
  • Fig. S4. Cyclic voltammograms of MEAs before and after AST.
  • Fig. S5. TEM images and particle distribution of Pt/C catalysts before and after AST.
  • Table S1. Current densities at 0.6 V and maximum power densities of MEA-0, MEA-10, MEA-20, and MEA-30 in O2 and air.
  • Table S2. Influence of AST on current densities at 0.6 V and maximum power densities of MEA-0 and MEA-20.
  • Table S3. EIS results for MEA-0 and MEA-20 after AST.

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