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(a) Averaged current values of the CA triplicates of the GDL|GA|NiArg-modified electrodes at 0.3 V (black trace) and 0.1 V (red trace) and (b) CV traces of the GDL|GA|NiArg before (black trace) and after (red trace) CA at 0.3 V vs RHE in 0.5 M H2SO4 solution purged with argon and with a constant flow of H2 at the back of the GDL (5 mL min–1) (ν = 20 mV s–1).
