Confined Atomically Mo‐Regulating Co³⁺ Sites Enhanced Electrocatalytic Seawater Oxidation

Abstract Design and construction of stable single‐atom modified catalysts with suppressed deep reconstruction for long‐term durability and highly active targeted catalysis in emains a great challenge. Herein, catalysts with nitrogen/oxygen co‐doped carbon (NOC) encapsulated Mo atomically dispersed at Co³⁺ sites in Co₃O₄, are constructed through a directed corrosion strategy. Meanwhile, the NOC confinement maintains the stability of single atoms Mo and promotes the adsorbate evolution into a lattice oxygen‐mediated mechanism. The reconstructed CoOOH is confined by the NOC layer, thus inhibiting its deep reconstruction, and electrostatically repelling chloride ions to achieve targeted electrolysis of seawater. In the real seawater flow cell, the electrode requires 1.94 V to reach 1.0 A cm⁻², and the energy consumption is 4.64 kWh Nm⁻³‐H₂ lower than that of industrial alkaline electrolysis. The continuous electrolysis at 1.0 A cm⁻² for 300 h shows almost no decay, and Faraday efficiency is close to 100%, indicating long‐lasting stability.