Transport and co‐transport of carboxylate ions and alcohols in cation exchange membranes
Transport and co‐transport of carboxylate ions and alcohols in cation exchange membranes
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阳离子交换膜中羧酸根离子和醇的传输和共传输
DOI：
10.1002/pol.20210383
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发表时间：
2021
影响因子：
3.4
通讯作者：
Beckingham, Bryan S.
中科院分区：
文献类型：
--
作者：
Kim, Jung Min;Beckingham, Bryan S.
了解多组分通过水合致密膜的传输行为对于许多应用都是有意义的。对于光电化学CO2还原电池（PEC-CRC）的特定情况，了解CO2电化学还原产物（包括移动的羧酸盐）的多组分输运行为非常重要（甲酸盐和乙酸盐）和醇类（甲醇和乙醇）在离子交换膜中，膜在这些装置中的一个作用是使这些CO2还原产物向阳极电解液的渗透最小化，因为它们经常氧化回二氧化碳。阳离子交换膜（CEM）是这种装置的有希望的候选者，因为它们起到使移动的阴离子（例如羧酸根）的渗透最小化的作用。然而，新的CEM的设计是必要的，因为羧酸盐的渗透通常在与醇的共渗透中增加。在这里，我们研究了羧酸盐和醇在两种类型的CEM中的传输行为：（1）通过磺化单体（AMPS）与交联剂（PEGDA）的自由基共聚制备交联CEM，以及（2）Nafion® 117。我们观察到PEGDA-AMPS和Nafion® 117在与醇共扩散时对羧酸盐的扩散率增加。我们将此行为归因于通过共扩散醇的电荷屏蔽，其降低了结合的磺酸盐和移动的羧酸盐之间的静电排斥。
Understanding multi‐component transport behavior through hydrated dense membranes is of interest for numerous applications. For the particular case of photoelectrochemical CO2reduction cells (PEC‐CRC), it is important to understand the multi‐component transport behavior of CO2electrochemical reduction products including mobile carboxylates (formate and acetate) and alcohols (methanol and ethanol) in the ion exchange membranes as one role of the membrane in these devices is to minimize the permeation of these CO2reduction products to the anolyte as they often oxidize back to CO2. Cation exchange membranes (CEM) are promising candidates for such devices as they act to minimize the permeation of mobile anions, such as carboxylates. However, the design of new CEMs is necessary as the permeation of carboxylates often increases in co‐permeation with alcohols. Here, we investigate the transport behavior of carboxylates and alcohols in two types of CEMs (1) a crosslinked CEM was prepared by free‐radical copolymerization of a sulfonated monomer (AMPS) with a crosslinker (PEGDA), and (2) Nafion® 117. We observe an increase in both PEGDA‐AMPS and Nafion® 117 diffusivities to carboxylates in co‐diffusion with alcohols. We attribute this behavior to charge screening by co‐diffusing alcohol that reduces the electrostatic repulsion between bound sulfonates and mobile carboxylates.
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影响因子：
6
作者：
Kim, Jung Min;Beckingham, Bryan S.
通讯作者：
Beckingham, Bryan S.
影响因子：
5.5
作者：
Chen, X. Chelsea;Kortright, Jeffrey B.;Balsara, Nitash P.
通讯作者：
Balsara, Nitash P.
影响因子：
4.6
作者：
Jang, Eui-Soung;Kamcev, Jovan;Freeman, Benny D.
通讯作者：
Freeman, Benny D.
一系列交联 AMPS/PEGDA 水凝胶膜中的水和离子吸附
影响因子：
4.6
作者：
N. Yan;D. R. Paul;B. Freeman
通讯作者：
B. Freeman
影响因子：
9.5
作者：
Geise, Geoffrey M.;Falcon, Linda P.;Paul, Donald R.
通讯作者：
Paul, Donald R.