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Updated: Jun 28, 2026

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
Published on: February 23, 2017
Regulating Interfacial Water Distribution and Ion Transport by Rigid-Flexible Dual-Piperidinium Ionomer toward
Jia-Ao Huang1, Hui Fan1, Wei Yuan2
1Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, State Key Laboratory of Porous Materials for Separation and Conversion, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemistry, Fudan University, Shanghai200438, China.
None:
The precise regulation of interfacial microenvironments by ionomers in membrane electrode assembly electrolyzers for CO2 reduction plays a pivotal role in determining their overall catalytic performance. Conventional anion exchange ionomers possess rigid molecular backbones that limit their ability to dynamically respond to the interfacial electric field. Herein, we report that a rigid-flexible dual-piperidinium anion exchange ionomer (DQ15) markedly enhances the CO2-to-CO conversion on silver nanoparticles at industrial-level current densities. Operando electrochemical impedance spectroscopy with distribution of relaxation times analysis, in conjunction with in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy, reveals that the DQ15 ionomer boosts ion conductivity at the triple-phase boundary by providing additional ion exchange sites and enriches local CO2 by disrupting the hydrogen-bond network of interfacial H2O, thus promoting the apparent CO2-to-CO electroreduction kinetics.
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