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Cyclic voltammetry of erGOx/Pt in (a) 0.5 M H2SO4 at 20 (solid), 50 (dashed), and 100 (dotted) mV/s, in (b) 1 M NH4OH at 10 mV/s (solid) vs Pt disk (dashed) and Vulcan/Pt 20% (dotted), and (c) hydrogen adsorption–desorption potential region expansion.
