Bipolar membrane processes have evolved as one of the most promising technologies in the field of acid and base production as well as many interesting separation applications. Herein, we report a rapid spray-crosslinked assembly for fabricating a high-performance polyelectrolyte bipolar membrane. Polyvinyl alcohol (PVA), glutaricdialdehyde (GA) and polyethyleneimine (PEI) are alternatively and successively sprayed onto a supporting cation-exchange membrane. GA crosslinked PVA and PEI are responsible for the interlayer and anion-exchange layer, respectively. Under optimal conditions, at a current density of 100 mA cm?2, the cell voltage of the BPM was as low as 1.79 V. Moreover, it has been demonstrated that the spray crosslinked membrane has good stability in acid and alkali harsh conditions. In contrast to the traditional casting method, spray assembly combined with chemical cross-linking can tune the membrane thickness at the nanoscale and microscale levels, as well as increase its charge density and ion-exchange capacity. This facile approach might open a new way to efficiently and flexibly produce various bipolar membranes with different polyelectrolytes.
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机译：双极性膜工艺已经发展成为酸和碱生产领域以及许多有趣的分离应用领域中最有前途的技术之一。在此，我们报告了一种用于制造高性能聚电解质双极膜的快速喷雾交联组件。将聚乙烯醇（PVA），戊二醛（GA）和聚乙烯亚胺（PEI）依次喷洒到支持性阳离子交换膜上。 GA交联的PVA和PEI分别负责中间层和阴离子交换层。在最佳条件下，在100 mA cm ？2 的电流密度下，BPM的电池电压低至1.79V。此外，已经证明喷雾交联膜在酸性和碱性苛刻条件下具有良好的稳定性。与传统的流延方法相比，喷雾组件与化学交联相结合可以在纳米级和微米级调节膜厚度，并增加其电荷密度和离子交换能力。这种简便的方法可能会开辟一条新途径，以高效，灵活地生产具有不同聚电解质的各种双极膜。
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