Chinese research team proposes a new strategy of decoupling seawater direct electrolysis for hydrogen production

2024-10-16

Reporters learned from Shenzhen University on the 15th that Xie Heping, an academician of the CAE Member and professor of Shenzhen University, proposed a new decoupled strategy for direct electrolysis of seawater to produce hydrogen on the side reaction and electrode corrosion caused by chloride ions in seawater, which will help enrich and further build a theoretical system and technical framework for electrolysis of seawater to produce hydrogen on the impact of complex components of seawater. The relevant research results were published on the same day in Nature Communications. The ocean is the largest 'hydrogen mine' on Earth. The electrolysis of seawater for hydrogen production is an important development path for the future energy system. The traditional seawater indirect hydrogen production technology first desalinates and then produces hydrogen, relying on complex seawater desalination processes and equipment, occupying a large area, with high investment costs and engineering difficulties. It is reported that this study addresses the most challenging issue of chloride ion interference in seawater hydrogen production by introducing an oxidation-reduction mediated decoupling strategy. By utilizing the advantages of both thermodynamics and kinetics in anodic reactions, it cleverly avoids the direct competition between oxygen evolution reactions and chloride ion reactions in traditional electrolytic water hydrogen production processes, significantly reducing electrochemical corrosion. At the same time, this study investigated the high efficiency of the cathodic hydrogen evolution reaction and anodic ferrocyanide oxidation reaction in the electrolysis system, clarified the reaction mechanism of oxygen spontaneous stable production under the decoupling system, and achieved the stable operation of the new system for 250 hours in real seawater environment. It further expands the new principle technology system of in-situ direct electrolysis hydrogen production without desalination of seawater by Academician Xie Heping's team, and will provide theoretical guidance for the industrial development of seawater direct electrolysis hydrogen production. (New Society)

Edit:Yao Jue    Responsible editor:Xie Tunan

Source:Science and Technology Daily

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