fig4
Figure 4. (A) Seawater HER performance with different volume ratios (v/v) of 0.5M H2SO4 and 1M KOH. The concentration is 10% v/v (S-H10/S-OH10), 30% v/v (S-H30/S-OH30) and 100% v/v (pure solution, S-H100/S-OH100), respectively; (B) The long-term stability in such a solution is tested at a constant RHE potential of -0.2 V within 24 h. HER: Hydrogen evolution reaction; RHE: Reversible hydrogen electrode.
