Science Advances

This PDF file includes:

• Supplementary Text
  
• fig. S1. In situ CVs obtained for three different loadings of CA#1.
  
• fig. S2. Difference in performance under air versus O₂ at 1 A/cm² for each of the three designs.
  
• fig. S3. CCL conductance versus ionomer EW.
  
• fig. S4. Schematic depiction of how CCL degradation may be expected to proceed in the case of attack by H₂O₂.
  
• fig. S5. N₂ gas sorption analysis of CA#1.
  
• fig. S6. Transmission electron microscopy images of CA#1 obtained at various magnifications.
  
• fig. S7. X-ray photoelectron spectroscopy characterization of CA#1.
  
• fig. S8. Polarization curves at beginning of test (BOT) (solid lines) and end of test (EOT) (dashed lines) for MEAs prepared from the three different catalyst loadings.
  
• table S1. Double-layer charge normalized to the charge obtained for the 1.0 mg/cm² design.
  
• table S2. XPS characterization of CA#1.
  
• table S3. Gas sorption analysis.
  
• table S4. Fe and Zn content based on inductively coupled plasma measurements of CA#1.

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