氢氧化物
膜
碳化作用
离子交换
离子
化学工程
扩散
化学
碳酸盐
无机化学
工作(物理)
电导率
碳酸盐离子
材料科学
热力学
物理化学
有机化学
工程类
物理
生物化学
作者
Fabian Kubannek,Avital Zhegur-Khais,Songlin Li,Dario R. Dekel,Ulrike Krewer
标识
DOI:10.1016/j.cej.2023.141534
摘要
We present a model-based analysis of the transport of anions in anion exchange membranes (AEMs) with the aim of understanding the decarbonation process and its dynamics. The dynamic simulation model covers the diffusive and migrative transport of water, carbonate anions, and hydroxide anions through an AEM. To the best of our knowledge, this is the first model studying decarbonation process in AEMs. The model is validated using decarbonation data from anion conductivity measurements of ten different AEM materials. Driven by migrative transport, strong concentration gradients develop inside the membranes. A parameter study reveals that the ion-exchange capacity and the applied current have the largest effect on the decarbonation dynamics. Further, high hydroxide diffusivities increase the decarbonation time constant, whereas high carbonate diffusivities decrease it. The results further indicate that high diffusivities of both carbonates and hydroxide result in slower membrane decarbonation. This work provides new insights into properties determining the carbonation and decarbonation of AEMs, which is critical for AEM-based electrochemical devices such as fuel cells and electrolysers.
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