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Limiting O2 mass transfer as proxy for CO2 mass transfer: Example LSV scan for SGL 39BC loaded with 1 mg Ag cm–2. HER, hydrogen evolution reaction; ORR, oxygen reduction reaction; O2 + 2 H2O + 4 e– → 4 OH–. The cathode potentials were corrected for the iR-drop between the reference electrode and the cathode. To reach sufficiently high currents with our potentiostat, we used a 6 M KOH electrolyte due its high conductivity.
