High-Performance Bipolar Membrane Development for Improved Water Dissociation,ACS Applied Polymer Materials

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High-Performance Bipolar Membrane Development for Improved Water Dissociation
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-08-19 , DOI: 10.1021/acsapm.0c00653
Yingying Chen ₁ , Jacob A Wrubel ₁ , W Ellis Klein ₁ , Sadia Kabir ₁ , Wilson A Smith _{1,

2,

3} , K C Neyerlin ₁ , Todd G Deutsch ₁

Affiliation

Bipolar membranes (BPMs) are the enabling component of many promising electrochemical devices used for separation and energy conversion. Here, we describe the development of high-performance BPMs, including two-dimensional BPMs (2D BPMs) prepared by hot-pressing two preformed membranes and three-dimensional BPMs (3D BPMs) prepared by electrospinning ionomer solutions and polyethylene oxide. Graphene oxide (GO_x) was introduced into the BPM junction as a water-dissociation catalyst. We assessed electrochemical performance of the prepared BPMs by voltage–current (V–I) curves and galvanostatic electrochemical impedance spectroscopy. We found the optimal GO_x loading in 2D BPMs to be 100 μg cm^–2, which led to complete coverage of GO_x at the interface. The integration of GO_x beyond this loading moderately improved electrochemical performance but significantly compromised mechanical strength. GO_x-catalyzed 2D BPMs showed comparable performance with a commercially available Fumasep BPM at current densities up to 500 mA cm^–2. The 3D BPMs exhibited even better performance: lower resistance and higher efficiency for water dissociation and substantially higher stability under repeated cycling up to high current densities. The improved electrochemical performance and mechanical stability of the 3D BPMs make them suitable for incorporation into CO₂ electrolysis devices where high current densities are necessary.

中文翻译：

开发高性能双极膜以改善水离解

双极膜 (BPM) 是许多用于分离和能量转换的有前途的电化学装置的支持组件。在这里，我们描述了高性能BPM的发展，包括通过热压两个预成型膜制备的二维BPM（2D BPM）和通过静电纺丝离聚物溶液和聚环氧乙烷制备的三维BPM（3D BPM）。氧化石墨烯 (GO _x ) 被引入 BPM 连接处作为水离解催化剂。我们通过电压-电流 ( V - I ) 曲线和恒电流电化学阻抗谱评估了所制备的 BPM 的电化学性能。我们发现 2D BPM 中的最佳 GO _x负载量为 100 μg cm ^–2 ，这使得 GO _x在界面处完全覆盖。超过此负载量的 GO _x集成适度提高了电化学性能，但显着损害了机械强度。 GO _x催化的 2D BPM 在高达 500 mA cm ^–2的电流密度下表现出与市售 Fumasep BPM 相当的性能。 3D BPM 表现出更好的性能：更低的电阻和更高的水离解效率，以及在高电流密度的重复循环下显着提高的稳定性。 3D BPM 改进的电化学性能和机械稳定性使其适合结合到需要高电流密度的CO ₂电解装置中。

更新日期：2020-08-19

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