4.

Representative LSV curves for HER on Pt (red) and GC (green) disk electrodes in H2 sparged and stirred 0.5 M H2SO4, collected at 100 mV/s. The thermodynamic HER redox potential (dashed gray line) is included for reference.

Representative LSV curves for HER on Pt (red) and GC (green) disk electrodes in H2 sparged and stirred 0.5 M H2SO4, collected at 100 mV/s. The thermodynamic HER redox potential (dashed gray line) is included for reference.