Science Advances

Supplementary Materials

This PDF file includes:

  • Equation for faradaic efficiency calculation for NH3 from NH3 measurements
  • Equation for instantaneous faradaic efficiency calculation for NH3 from H2 measurements
  • Equation for faradaic NH3 concentration
  • Equation for energy consumption
  • Fig. S1. Representative current waveforms measured in the plasma electrolytic system during NH3 synthesis.
  • Fig. S2. RGA measurements of mass/charge ratio (m/z) = 2 and 17, corresponding to H2 and NH3 partial pressure, at 2 mA in a plasma electrolytic reactor by analyzing exhaust gas from cell as a function of time.
  • Fig. S3. H2 production in the plasma electrolytic system.
  • Fig. S4. Schematic of the hybrid plasma electrolytic system in a split H-cell geometry.
  • Fig. S5. Comparison of NOx produced with that predicted from O2 gas evolution in plasma electrolytic system.
  • Fig S6. Heating of solution in the plasma electrolytic system.
  • Fig. S7. Representative fluorescence assay calibration used to determine NH3 produced.
  • Fig. S8. Representative fluorescence assay calibration used to determine NOx produced.
  • Table S1A. Summary of NH3 produced by plasma electrolytic synthesis for the following configurations: N2 both flowing through the cathode tube where the plasma is normally generated and bubbled through the solution to purge, but no electrical power applied, Ar as both the supply gas in the plasma and purge gas, Ar as the supply gas in the plasma and N2 as the purge gas, and N2 as both the supply gas in the plasma and purge gas.
  • Table S1B. Summary of one-sample and two-sample t tests carried out on datasets in table S1A.
  • Table S2A. Summary of NH3 produced and faradaic efficiencies by plasma electrolytic synthesis after different processing times.
  • Table S2B. Summary of one-sample and two-sample t tests carried out on datasets in table S2A.
  • Table S3A. Summary of NH3 produced and faradaic efficiencies by plasma electrolytic synthesis at different currents.
  • Table S3B. Summary of one-sample and two-sample t tests carried out on datasets in table S3A.
  • Table S3C. Summary of H2 produced in plasma electrolytic reactor by analyzing exhaust gas using GC.
  • Table S4A. Summary of NH3 produced and faradaic efficiencies by plasma electrolytic synthesis in a split cell.
  • Table S4B. Summary of two-sample t tests carried out on datasets in table S4A (and tables S2A and S3A).
  • Table S5A. Summary of NH3 produced and faradaic efficiencies by plasma electrolytic synthesis at different pH values.
  • Table S5B. Summary of one-sample and two-sample t tests carried out on datasets in table S5A.
  • Table S6A. Summary of NH3 produced and faradaic efficiencies by plasma electrolytic synthesis in the presence of NO3 and NO2 scavengers.
  • Table S6B. Summary of one-sample and two-sample t tests carried out on datasets in table S6A.
  • Table S7A. Summary of NOx produced by plasma electrolytic synthesis after different processing times and at different currents.
  • Table S7B. Summary of one-sample and two-sample t tests carried out on datasets in table S7A.
  • Table S8. Summary of voltages measured between the plasma cathode and the Pt anode as a function of the plasma current in the plasma electrolytic system.

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