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Construction and application of quaternized polyether ether ketone
membranes for electrocatalytic CO2 reduction

Authors： LIU Xueling, GAO Ling, YANG Hongyan, LI Jinchao, CHEN Liang, CHEN Qin, ZHANG Yaping

Units： Engineering Research Center of Biomass Materials (Ministry of Education), School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, China

KeyWords： membrane; quaternized polyether ether ketone; electrocatalytic CO2 reduction

ClassificationCode：TQ425.23； TB324

year,volume(issue):pagination： 2025,45(3):23-34

Abstract：

In this paper, the polyether ether ketone containing benzyl bromomethyl (PEEK-Br) polymer was obtained by substitution reaction using the self-synthesized polyether ether ketone (PEEK) as the backbone. Subsequently, a series of quaternized polyether ether ketone (QAPEEK) membranes were prepared by reacting the PEEK-Br with different types of quaternary ammonium compounds. The chemical structures, micro-morphologies, physico-chemical properties and electrocatalytic CO2 reduction performances of QAPEEK membranes were systematically investigated. The results showed that the as-prepared QAPEEK-pip membrane with 1-methylpiperidine as the quaternary ammonium compound had a excellent OH- conductivity (15.62 mS/cm) and selectivity (56.2%). The CO Faraday efficiency and CO partial current density of H-type electrolytic cell with QAPEEK-pip membrane could reach 98.09% and -11.56 mA/cm2 at -1.7 V, respectively. And, the CO Faraday efficiency of MEA reactor with QAPEEK-pip membrane was 92.5% at -60 mA/cm2. More importantly, the QAPEEK-pip membrane exhibited excellent performance stability in the H-type electrolytic cell and MEA reactor after 24 h continuous operation. Based on these findings, this work not only investigated the influence of molecular structure and quaternary ammonium group type on the performance of QAPEEK membranes, but also provided practical references for the development of electrocatalytic CO2 reduction membrane material.

Funds：

国家自然科学基金项目（22478321, U20A20125）; 西南科技大学研究生创新基金项目（24ycx1072）

AuthorIntro：

刘雪铃（2000-）, 女, 四川凉山州人, 硕士研究生, 从事电催化CO2还原膜的研究

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