AI Article Synopsis
- Direct seawater electrolysis is a promising method for producing clean hydrogen fuel, but it faces challenges due to corrosion of the anode from chlorine buildup.
- A new anode design using cobalt ferricyanide/cobalt phosphide can effectively catalyze the process at high current densities without corroding over extended periods.
- The study shows that certain byproducts generated during the electrolysis actively repel chlorine, significantly reducing its harmful adsorption and enhancing the electrode's durability.
Article Abstract
The direct seawater electrolysis at high current density and low overpotential affords an effective strategy toward clean and renewable hydrogen fuel production. However, the severe corrosion of anode as a result of the saturation of Cl upon continuous seawater feeding seriously hamper the electrolytic process. Herein, cobalt ferricyanide / cobalt phosphide (CoFePBA/Co P) anodes with Cap/Pin structure are synthesized, which stably catalyze alkaline saturated saline water oxidation at 200-2000 mA cm over hundreds of hours without corrosion. Together with the experimental findings, the molecular dynamics simulations reveal that PO and Fe(CN) generated by the electrode play synergistic role in repelling Cl via electrostatic repulsion and dense coverage, which reduced Cl adsorption by nearly 5-fold. The novel anionic synergy endow superior corrosion protection for the electrode, and is expected to promote the practical application of saline water electrolysis.
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| http://dx.doi.org/10.1002/anie.202309882 | DOI Listing |
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