Sn-doped CoOOH–PO₄³⁻ catalyst

Chlorine-resistant seawater electrolysis

Constructs an asymmetric Co–OH–Sn(d¹⁰) configuration to weaken over-stabilized OH adsorption, lowering the OER rate-determining step barrier and significantly enhancing activity and durability for seawater electrolysis.

Shen, Wang · Zhang, Jiachen · Shuyu, Jia · Liu, Qicheng · Jialin, Li · Wang, Jiali · Tang, Yawen · Sun, Hanjun

ACS Catalysis 2026

Specifications

Simulated seawater electrolysis stability

{'zh': '1000', 'en': '1000'} h

Alkaline natural seawater electrolysis stability

{'zh': '500', 'en': '500'} h

Advantages

Dramatically enhanced durability

The asymmetric Co–OH–Sn(d¹⁰) configuration reduces surface OH coverage, enabling 1000 h operation at 750 mA cm⁻².

Chloride corrosion resistance

The reconstructed phosphate layer electrostatically repels Cl⁻, and the asymmetric configuration reduces OH coverage, jointly inhibiting chloride adsorption.

Stable at high current density

Operates stably at 500 mA cm⁻² in alkaline natural seawater for 500 h without significant degradation.

Applications

• Seawater electrolysis for hydrogen production：Provides anode catalyst for direct seawater electrolysis, avoiding chloride corrosion and enabling stable hydrogen production.
• Chlorine-resistant anode catalyst：Phosphate layer electrostatically repels Cl⁻, protecting the anode and extending catalyst lifetime.
• Water electrolysis catalyst：Lowers OER barrier via asymmetric Co–OH–Sn configuration, enhancing water electrolysis efficiency.