The chlor-alkali process plays an essential and irreplaceable role in the modern chemical industry due to the wide-ranging applications of chlorine gas. However, the large overpotential and low selectivity of current chlorine evolution reaction (CER) electrocatalysts result in significant energy consumption during chlorine production. Herein, we report a highly active oxygen-coordinated ruthenium single-atom catalyst for the electrosynthesis of chlorine in seawater-like solutions. As a result, the as-prepared single-atom catalyst with Ru-O₄moiety (Ru-O₄SAM) exhibits an overpotential of only ~30 mV to achieve a current density of 10 mA cm⁻²in an acidic medium (pH = 1) containing 1 M NaCl. Impressively, the flow cell equipped with Ru-O₄SAM electrode displays excellent stability and Cl₂selectivity over 1000 h continuous electrocatalysis at a high current density of 1000 mA cm⁻². Operando characterizations and computational analysis reveal that compared with the benchmark RuO₂electrode, chloride ions preferentially adsorb directly onto the surface of Ru atoms on Ru-O₄SAM, thereby leading to a reduction in Gibbs free-energy barrier and an improvement in Cl₂selectivity during CER. This finding not only offers fundamental insights into the mechanisms of electrocatalysis but also provides a promising avenue for the electrochemical synthesis of chlorine from seawater electrocatalysis.

Sulfur defective V₅S₈/CNFs is synthesized by an electrospinning method, followed by sulfuration treatment. The obtained composite exhibits attractive capacities and ultra-stable cycling performances when using as anode materials for sodium-ion and potassium-ion batteries.