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

Overview

Journal ACS Cent Sci

Specialty Chemistry

Date 2024 Jan 1

PMID 38161362

Authors

Dingyang Chen

Yue Li

Xinyue Zhao

Minsi Shi

Xiaoyuan Shi

Rui Zhao

Guangshan Zhu

Affiliations

Soon will be listed here.

Abstract

Electrochemical uranium extraction from seawater provides a new opportunity for a sustainable supply of nuclear fuel. However, there is still room for studying flexible electrode materials in this field. Herein, we construct amidoxime group modified porous aromatic frameworks (PAF-144-AO) on flexible carbon cloths using an easy to scale-up electropolymerization method followed by postdecoration to fabricate the self-standing, binder-free, metal-free electrodes (PAF-E). Based on the architectural design, adsorption sites (amidoxime groups) and catalytic sites (carbazole groups) are integrated into PAF-144-AO. Under the action of an alternating electric field, uranyl ions are selectively captured by PAN-E and subsequently transformed into NaO(UO·HO) precipitates in the presence of Na via reversible electron transfer, with an extraction capacity of 12.6 mg g over 24 days from natural seawater. This adsorption-electrocatalysis mechanism is also demonstrated at the molecular level by spectroscopy. Our work offers an effective approach to designing flexible porous organic polymer electrodes, which hold great potential in the field of electrochemical uranium extraction from seawater.

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