Performance and Stability of Aemion and Aemion+ Membranes in Zero‐Gap CO2 Electrolyzers with Mild Anolyte Solutions

Author:

Mardle Peter12ORCID,Gangrade Apurva2ORCID,Saatkamp Torben2ORCID,Jiang Zhengming1,Cassegrain Simon2ORCID,Zhao Nana1ORCID,Shi Zhiqing1ORCID,Holdcroft Steven2ORCID

Affiliation:

1. Energy Mining & Environment Research Centre National Research Council Canada Vancouver BC V6T 1 W5 Canada

2. Department of Chemistry Simon Fraser University Burnaby BC V5 A 1S6 Canada

Abstract

AbstractThe dependence of performance and stability of a zero‐gap CO2 electrolyzer on the properties of the anion exchange membrane (AEM) is examined. This work firstly assesses the influence of the anolyte when using an Aemion membrane and then shows that when using 10 mM KHCO3, a CO2 electrolyzer using a next‐generation Aemion+ membrane can achieve lower cell voltages and longer lifetimes due to increased water permeation. The impact of lower permselectivity of Aemion+ on water transport is also discussed. Using Aemion+, a cell voltage of 3.17 V at 200 mA cm−2 is achieved at room temperature, with a faradaic efficiency of >90 %. Stable CO2 electrolysis at 100 mA cm−2 is demonstrated for 100 h, but with reduced lifetime at 300 mA cm−2. However, the lifetime of the cell at high current densities is shown to be increased by improving water transport characteristics of the AEM and reducing dimensional swelling, as well as by improving cathode design to reduce localized dehydration of the membrane.

Publisher

Wiley

Subject

General Energy,General Materials Science,General Chemical Engineering,Environmental Chemistry

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