• Figure S4 CV curves in O2 variation electrolyte concentration 

  Schmitt, Nicolai; Schmidt, Mareike; Mueller, Jonathan E.; Schmidt, Lasse; Etzold, Bastian J.M. (2022)

• Figure 1 Influence CE size + WE loading 

  Schmitt, Nicolai; Schmidt, Mareike; Mueller, Jonathan E.; Schmidt, Lasse; Etzold, Bastian J.M. (2022)

• Figure 2 Influence CE position 

  Schmitt, Nicolai; Schmidt, Mareike; Mueller, Jonathan E.; Schmidt, Lasse; Etzold, Bastian J.M. (2022)

• Figure 3 Comparison iR correction technique 

  Schmitt, Nicolai; Schmidt, Mareike; Mueller, Jonathan E.; Schmidt, Lasse; Etzold, Bastian J.M. (2022)

• Figure S8 Influence CE position EIS 

  Schmitt, Nicolai; Schmidt, Mareike; Mueller, Jonathan E.; Schmidt, Lasse; Etzold, Bastian J.M. (2022)

• Figure S10 Influence electrolyte temperature EIS 

  Schmitt, Nicolai; Schmidt, Mareike; Mueller, Jonathan E.; Schmidt, Lasse; Etzold, Bastian J.M. (2022)

• Figure S9 j limit, iR drop, c(HlCO4) 

  Schmitt, Nicolai; Schmidt, Mareike; Mueller, Jonathan E.; Schmidt, Lasse; Etzold, Bastian J.M. (2022)

• Figure S5 LSV varying compliance voltage 

  Schmitt, Nicolai; Schmidt, Mareike; Mueller, Jonathan E.; Schmidt, Lasse; Etzold, Bastian J.M. (2022)

• Figure S7 Influence catalyst coated area 

  Schmitt, Nicolai; Schmidt, Mareike; Mueller, Jonathan E.; Schmidt, Lasse; Etzold, Bastian J.M. (2022)

• Figure 7: Influence of the electrolyte concentration on A) CVs in N2-atmosphere at 100 mV s-1 and B) the resulting ECSA (derived from H+- + CO-Stripping) for GDEs with a loading of 100 µgPt cm-2. 

  Schmitt, Nicolai; Schmidt, Mareike; Hübner, Gerold; Etzold, Bastian J.M. (2022-04-25)

• Figure 5: Electrochemical properties of GDEs with varying catalyst loadings. 

  Schmitt, Nicolai; Schmidt, Mareike; Hübner, Gerold; Etzold, Bastian J.M. (2022-04-25)

• Figure S5: EIS data at vayring current density 

  Schmitt, Nicolai; Schmidt, Mareike; Hübner, Gerold; Etzold, Bastian J.M. (2022-04-25)

• Figure 6: A) ORR polarization curves and B) mass specific activity (MSA) in oxygen atmosphere for varying catalyst loading on the GDE measured in 2 M HClO4 in O2-atmosphere by application of protocol 6b 

  Schmitt, Nicolai; Schmidt, Mareike; Hübner, Gerold; Etzold, Bastian J.M. (2022-04-25)

• Figure S6: A) ORR polarization curves and B) mass specific activity (MSA) in oxygen atmosphere for varying catalyst loading on the GDE measured by application of protocol 6a. 

  Schmitt, Nicolai; Schmidt, Mareike; Hübner, Gerold; Etzold, Bastian J.M. (2022-04-25)

• Figure S4: ORR current density at a potential of 0.85 V vs. RHE of GDEs prepared with catalyst ink containing a varying percentage of ethanol in the water/ethanol solvent mixture 

  Schmitt, Nicolai; Schmidt, Mareike; Hübner, Gerold; Etzold, Bastian J.M. (2022-04-25)

• Figure S7: Mass specific ORR activity determined by interpolation out of the recorded polarization curves shown in Figure 6 in O2-atmosphere depending on the catalyst loading. 

  Schmitt, Nicolai; Schmidt, Mareike; Hübner, Gerold; Etzold, Bastian J.M. (2022-04-25)

• Figure 8: Influence of the electrolyte concentration on the ORR activity measured for GDEs with a loading of 100 µgPt cm-2 in synthetic air. 

  Schmitt, Nicolai; Schmidt, Mareike; Hübner, Gerold; Etzold, Bastian J.M. (2022-04-25)

• Figure S8: Influence of the electrolyte concentration on the ORR activity measured for GDEs with a loading of 100 µgPt cm-2. A) influence on CV curves in O2-atmosphere. B) influence on the limiting current in O2 and synthetic air derived from the plateau of the respective CV curves. 

  Schmitt, Nicolai; Schmidt, Mareike; Hübner, Gerold; Etzold, Bastian J.M. (2022-04-25)

• Figure 2: Determination of the ECSA in RDE and GDE measurements 

  Schmitt, Nicolai; Schmidt, Mareike; Hübner, Gerold; Etzold, Bastian J.M. (2022-04-25)

• Figure 4: Temperature evolution of the cell electrolyte during application of ORR protocol 6a and ORR protocol 6b 

  Schmitt, Nicolai; Schmidt, Mareike; Hübner, Gerold; Etzold, Bastian J.M. (2022-04-25)

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