Mardle Peter, Gangrade Apurva, Saatkamp Torben, Jiang Zhengming, Cassegrain Simon, Zhao Nana, Shi Zhiqing, Holdcroft Steven
Energy, Mining & Environment Research Centre, National Research Council Canada, Vancouver, BC V6T 1 W5, Canada.
Department of Chemistry, Simon Fraser University, Burnaby, BC V5 A 1S6, Canada.
ChemSusChem. 2023 Jul 21;16(14):e202202376. doi: 10.1002/cssc.202202376. Epub 2023 Jun 13.
The dependence of performance and stability of a zero-gap CO 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 KHCO , a CO 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 is achieved at room temperature, with a faradaic efficiency of >90 %. Stable CO electrolysis at 100 mA cm is demonstrated for 100 h, but with reduced lifetime at 300 mA cm . 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.
研究了零间隙CO电解槽的性能和稳定性对阴离子交换膜（AEM）性能的依赖性。这项工作首先评估了使用Aemion膜时阳极电解液的影响，然后表明，当使用10 mM KHCO时，由于水渗透率增加，使用下一代Aemion+膜的CO电解槽可以实现更低的电池电压和更长的寿命。还讨论了Aemion+较低的选择透过性对水传输的影响。使用Aemion+，在室温下，200 mA cm时的电池电压为3.17 V，法拉第效率>90%。在100 mA cm下实现了100 h的稳定CO电解，但在300 mA cm下寿命缩短。然而，通过改善AEM的水传输特性和减少尺寸膨胀，以及通过改进阴极设计以减少膜的局部脱水，可提高电池在高电流密度下的寿命。
