Science Advances

Supplementary Materials

This PDF file includes:

  • fig. S1. Window of redox stability of conductive PDA.
  • fig. S2. Electrochemical setup for electrocatalytic CO2RR.
  • fig. S3. Local pH as measured in the electrolyte system (0.1 M TBA-PF6, 25°C, acetonitrile, CO2-saturated) at various amounts of water added.
  • fig. S4. 13C NMR spectra.
  • fig. S5. Conductivity versus time.
  • fig. S6. Conductivity (dc) of PDA in various liquids.
  • fig. S7. pH values during electrosynthesis of formate in acetonitrile-water (0.1 M TBA-PF6) blends at 25°C, CO2-purged (30 min).
  • fig. S8. Chronoamperometric scan (continuous and semicontinuous).
  • fig. S9. Stability aspects and mechanisms shown by in situ FTIR.
  • fig. S10. Differential in situ spectra in the spectral fingerprint regime.
  • fig. S11. ATR-FTIR (in situ measurement cell) with reference 0.1 M TBA-formate and saturated CO2.
  • fig. S12. XPS survey scan of conductive PDA.
  • fig. S13. N1s HR XPS scan.
  • fig. S14. C1s HR XPS scan.
  • fig. S15. O1s HR XPS scan.
  • fig. S16. O1s HR XPS scan.
  • table S1. State-of-the-art CO2RR electrocatalysts, namely, for CO, formate, and related (hydro)carbon products.
  • table S2. Electrochemical impedance data.

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