Figure 5: HER stability tests.
From: Atomic cobalt on nitrogen-doped graphene for hydrogen generation
(a) Accelerated stability measurements by recording the polarization curves for the Co-NG catalyst before and after 1,000 cyclic voltammograms at a scan rate of 50 mV s−1 under acidic (black curves) and basic conditions (red curves). (b) Plot of η vs t for the Co-NG catalyst at a constant cathodic current density of 10 mA cm−2 under acidic and basic conditions.
