Self-Standing Porous Aromatic Framework Electrodes for Efficient Electrochemical Uranium Extraction

Area of Science:

• Materials Science
• Electrochemistry
• Environmental Science

Background:

• Electrochemical uranium extraction from seawater is a promising route for sustainable nuclear fuel.
• Flexible electrode materials are crucial for efficient and scalable applications in this field.

Purpose of the Study:

• To develop novel, flexible, metal-free electrodes for electrochemical uranium extraction.
• To investigate the adsorption-electrocatalysis mechanism for uranyl ion capture and transformation.

Main Methods:

• Fabrication of amidoxime-modified porous aromatic frameworks (PAF-144-AO) on carbon cloth via electropolymerization and postdecoration.
• Creation of self-standing, binder-free electrodes (PAF-E).
• Utilizing an alternating electric field for selective uranyl ion capture and conversion.

Main Results:

• Achieved an extraction capacity of 12.6 mg g⁻¹ over 24 days from natural seawater.
• Demonstrated selective capture of uranyl ions by amidoxime groups and subsequent transformation into precipitates.
• Confirmed the adsorption-electrocatalysis mechanism at the molecular level using ex situ spectroscopy.

Conclusions:

• Developed an effective approach for designing flexible porous organic polymer electrodes.
• Highlighted the potential of PAF-E electrodes for electrochemical uranium extraction from seawater.
• Established a sustainable method for nuclear fuel resource recovery.