Uniaxial β-ketoamine COF

Record seawater production rate

Axial symmetry endows the framework with a narrower bandgap, better charge separation, and lower reaction barriers, enabling stable and efficient H₂O₂ production in real seawater.

Zeng, Minfeng · Shao, Mingchao · Guo, Yunlong

Chemical Science 2026

Specifications

H₂O₂ production rate (O₂)

{'zh': '12865.2', 'en': '12865.2'} µmol g⁻¹ h⁻¹

H₂O₂ production rate (air)

{'zh': '8557.4', 'en': '8557.4'} µmol g⁻¹ h⁻¹

Activity retention

{'zh': '90', 'en': '90'} %

Advantages

Record seawater production

The uniaxial symmetric COF achieves a record H₂O₂ production rate of 12865.2 μmol g⁻¹ h⁻¹ in real seawater from the Zhoushan Sea.

Stable in seawater

Over 90% activity was retained after 20 cycles and 30 days of immersion, indicating robust framework stability in complex ionic environments.

Works in air

Without pure oxygen atmosphere, the production rate remains 8557.4 μmol g⁻¹ h⁻¹ in air, lowering practical operation requirements.

Applications

• Photocatalytic H₂O₂ production：Produces H₂O₂ directly from seawater, eliminating the need for freshwater or pure water.
• Marine resource utilization：Uses seawater as the reaction medium, enabling in situ solar-to-chemical conversion.
• Covalent organic framework materials：Tailoring axial symmetry optimizes band structure and active sites of COFs for enhanced photocatalysis.
• Photocatalysts：Acts as a robust photocatalyst for efficient H₂O₂ generation in complex ionic environments.
• Solar energy conversion：Achieves efficient solar-to-H₂O₂ energy conversion, especially in seawater scenarios.