Seawater electrolysis provides a sustainable pathway for large-scale hydrogen production without reliance on freshwater resources.However,its practical implementation is hindered by the short lifespan of anodes,primar...Seawater electrolysis provides a sustainable pathway for large-scale hydrogen production without reliance on freshwater resources.However,its practical implementation is hindered by the short lifespan of anodes,primarily caused by chlorine-induced corrosion in seawater.Herein,we present a self-sustaining anode protection strategy that remarkably enhances the durability of seawater electrolysis for efficient hydrogen production.This OH^(–)-trapping anode is designed by trapping OH^(–)within in-situ generated Lewis acid sites and structural vacancies formed via alkaline corrosion of amorphous NiMoSx.This design creates an anion-rich electrode interface with spontaneous accumulation and continuous replenishment of OH^(–)from the bulk electrolyte,ensuring long-lasting anode protection against corrosion through the electrostatic repulsion of chloride ions during operation.Simultaneously,it directs the anodic reaction along a stable adsorbate evolution mechanism with minimal metal leaching.Consequently,alkaline seawater electrolysis avoiding chlorine-induced corrosion achieves an exceptional lifespan exceeding 3,000 h under industrial current densities.By directly utilizing OH^(–)from the alkaline electrolyte for long-term anode protection,the operational complexity and cost of seawater electrolysis are significantly reduced,making it highly appealing for practical use.展开更多
基金supported by the National Natural Science Foundation of China(No.52372175)the General Program of Science and Technology of Liaoning(2024-MSBA-20)+1 种基金the Innovation and Technology Fund of Dalian(2023JJ12GX020)the Fundamental Research Funds for the Central Universities(DUT24ZD406)。
文摘Seawater electrolysis provides a sustainable pathway for large-scale hydrogen production without reliance on freshwater resources.However,its practical implementation is hindered by the short lifespan of anodes,primarily caused by chlorine-induced corrosion in seawater.Herein,we present a self-sustaining anode protection strategy that remarkably enhances the durability of seawater electrolysis for efficient hydrogen production.This OH^(–)-trapping anode is designed by trapping OH^(–)within in-situ generated Lewis acid sites and structural vacancies formed via alkaline corrosion of amorphous NiMoSx.This design creates an anion-rich electrode interface with spontaneous accumulation and continuous replenishment of OH^(–)from the bulk electrolyte,ensuring long-lasting anode protection against corrosion through the electrostatic repulsion of chloride ions during operation.Simultaneously,it directs the anodic reaction along a stable adsorbate evolution mechanism with minimal metal leaching.Consequently,alkaline seawater electrolysis avoiding chlorine-induced corrosion achieves an exceptional lifespan exceeding 3,000 h under industrial current densities.By directly utilizing OH^(–)from the alkaline electrolyte for long-term anode protection,the operational complexity and cost of seawater electrolysis are significantly reduced,making it highly appealing for practical use.
