Design Rules for Membranes from Polymers of Intrinsic Microporosity for Crossover-free Aqueous Electrochemical Devices
Design Rules for Membranes from Polymers of Intrinsic Microporosity for Crossover-free Aqueous Electrochemical Devices
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DOI：
10.1016/j.joule.2019.08.025
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发表时间：
2019-12-18
期刊：
影响因子：
39.8
通讯作者：
Helms, Brett A.
中科院分区：
文献类型：
--
作者：
Baran, Miranda J.;Braten, Miles N.;Helms, Brett A.
在这里，我们奠定了连接微孔聚合物膜结构和孔化学膜的稳定性，电导率和运输选择性在水溶液电解质在广泛的pH值范围内的设计规则。我们把这些属性的前景无交叉电化学电池操作。这些指导原则适用于两种新兴的电池化学品，用于板栅电池：特别是Zn-TEMPO-4-硫酸盐和Zn-K4 Fe（CN）（6）电池。我们成功的关键是可电离的偕胺肟官能团，这是稳定的高pH值，微孔梯形聚合物膜的孔内的位置，产生一个家庭的电荷中性和阳离子交换膜在低和高pH值，我们称之为AquaPIM。它们显著的高电导率（在5.0 M KOH水溶液中高达21.5 mS cm（-1））和高传输选择性（通过膜的活性材料渗透性降低高达10（4））表明了电池开发的令人兴奋的机会，甚至超出了目前所展示的那些。
Here, we lay the design rules for linking microporous polymer membrane architecture and pore chemistry to membrane stability, conductivity, and transport selectivity in aqueous electrolytes over a broad range of pH. We tie these attributes to prospects for crossover-free electrochemical cell operation. These guiding principles are applied to two emerging cell chemistries for grid batteries: specifically, Zn-TEMPO-4-sulfate and Zn-K4Fe(CN)(6) cells. Key to our success is the placement of ionizable amidoxime functionalities, which are stable at high pH, within the pores of microporous ladder polymer membranes, yielding a family of charge-neutral and cation exchange membranes at low and high pH, respectively-which we call AquaPIMs. Their notably high conductivity (up to 21.5 mS cm(-1) in 5.0 M aqueous KOH) and high transport selectivity (up to 10(4) reduction in active-material permeability through the membrane) suggest exciting opportunities for battery development, even beyond those presently demonstrated.