Energy‐Saving Hydrogen Production by Seawater Electrolysis Coupling Sulfion Degradation

Abstract Electrolysis of costless and infinite seawater is a promising way toward grid‐scale hydrogen production without causing freshwater stress. Practical potential of this technology, however, is hindered by low energy efficiency and anode corrosion by the detrimental chlorine chemistry in seawater in addition to unaffordable electricity expense. Herein, energy‐saving hydrogen production is reported by chlorine‐free seawater splitting coupling sulfion oxidation. It yields hydrogen at a low cell voltage of 0.97 V, cutting the electricity consumption to 2.32 kWh per m 3 H 2 at 300 mA cm −2 . Compared to alkaline water electrolysis, the energy expense is primarily saved by 60% with 50% lower energy equivalent…

• NN
  National Natural Science Foundation of China

  Awards: 51972040, 51772040
• FR
  Fundamental Research Funds for the Central Universities

  Awards: DUT20LAB307, DUT20TD203