Ion-Selective Microporous Polymer Membranes with Hydrogen-Bond and Salt-Bridge Networks for Aqueous Organic Redox Flow Batteries.
Ion-Selective Microporous Polymer Membranes with Hydrogen-Bond and Salt-Bridge Networks for Aqueous Organic Redox Flow Batteries.
复制标题
用于水性有机氧化还原液流电池的具有氢键和盐桥网络的离子选择性微孔聚合物膜。
DOI：
10.1002/adma.202210098
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Wang A
中科院分区：
文献类型：
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作者：
Wang A
氧化还原液流电池（RFB）在长期电网规模储能方面具有巨大的潜力。离子传导膜是RFB中的关键组件，允许携带电荷的离子传输，同时防止氧化还原对的交叉混合。商业Nafion膜广泛用于RFB，但其不令人满意的离子和分子选择性以及高成本限制了该技术的性能和广泛部署。为了延长RFB系统的寿命并降低其成本，非常需要同时提供低离子电阻和对氧化还原活性物质的高选择性的廉价离子选择性膜。在这里，高性能RFB膜由具有固有微孔性的羧酸盐和偕胺肟官能化聚合物的共混物制成，该共混物利用了两种聚合物的有益特性。焓驱动的内聚链间相互作用（包括氢键和盐桥）的形成促进了共混物的微观相容性，而亚纳米孔内的可电离官能团允许优化膜离子传输功能。所得的微孔膜显示出快速的阳离子传导，氧化还原活性分子种类的交叉低，使得能够在使用蒽醌和亚铁氰化物作为氧化还原对的水性RFB中提高额定功率和降低容量衰减。
Redox flow batteries (RFBs) have great potential for long‐duration grid‐scale energy storage. Ion‐conducting membranes are a crucial component in RFBs, allowing charge‐carrying ions to transport while preventing the cross‐mixing of redox couples. Commercial Nafion membranes are widely used in RFBs, but their unsatisfactory ionic and molecular selectivity, as well as high costs, limit the performance and the widespread deployment of this technology. To extend the longevity and reduce the cost of RFB systems, inexpensive ion‐selective membranes that concurrently deliver low ionic resistance and high selectivity toward redox‐active species are highly desired. Here, high‐performance RFB membranes are fabricated from blends of carboxylate‐ and amidoxime‐functionalized polymers of intrinsic microporosity, which exploit the beneficial properties of both polymers. The enthalpy‐driven formation of cohesive interchain interactions, including hydrogen bonds and salt bridges, facilitates the microscopic miscibility of the blends, while ionizable functional groups within the sub‐nanometer pores allow optimization of membrane ion‐transport functions. The resulting microporous membranes demonstrate fast cation conduction with low crossover of redox‐active molecular species, enabling improved power ratings and reduced capacity fade in aqueous RFBs using anthraquinone and ferrocyanide as redox couples.