Engineered PW<sub>12</sub>-polyoxometalate docked Fe sites on CoFe hydroxide anode for durable seawater electrolysis.
basic_science · Level V
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- Record sourced from PubMed, PMID 40593508.
- Also identified by DOI 10.1038/s41467-025-60620-9 and PMC identifier 12214576.
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Abstract
Seawater electrolysis driven by offshore renewable energy is a promising avenue for large-scale hydrogen production but faces challenges in designing robust anodes that suppress surface chlorine reactions and corrosion at high current densities. Here we report a strategy by selectively docking PW<sub>12</sub>-polyoxometalate (PW<sub>12</sub>-POM) onto Fe sites of CoFe hydroxide anode to modulate the electronic structure of adjacent Co active centers and regulate Cl⁻/OH⁻ adsorption for efficient alkaline seawater oxidation. Our CoFe-based anode achieves low overpotentials, high catalytic selectivity, and notable durability, with continuous operation at 1 A cm⁻² for over 1300 hours and at 2 A cm⁻² more than 600 hours. Theoretical calculations and ex situ/in situ analyses reveal that PW<sub>12</sub>-POM coordination at Fe sites stabilizes Fe, suppresses its leaching, modulates Co acidity, promotes OH⁻ adsorption, and protects metal sites from Cl⁻ corrosion.