Imidazole and imidazolium functionalized poly(vinyl chloride) blended polymer membranes reinforced by PTFE for vanadium redox flow batteries

IF 4.5 3区化学 Q1 Chemical Engineering

Journal of Electroanalytical Chemistry Pub Date : 2023-09-01 DOI:10.1016/j.jelechem.2023.117643

Fan Yang , Yu Dai , Yu Zhang , Wei Wei , Shicheng Xu , Ronghuan He

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引用次数: 1

Abstract

A novel blended polymer membrane is prepared by a facile route for using as the diaphragm in vanadium redox flow batteries (VRFBs). The polymers polyvinylchloride (PVC) and polyvinylpyrrolidone (PVP) are first blended in a 1.2:1 mol ratio to give a PVP-PVC mixture, and the PVC in the mixture is then functionalized with 1-(3-aminopropyl)-imidazole (APIm). The functionalized polymers are impregnated into the porous polytetrafluoroethylene (PTFE) to fabricate membranes. The obtained membranes possess superior affinity to sulfuric acid mainly due to acid-base interactions between APIm groups and sulfuric acid molecules. The presence of hydrophobic PTFE restricts the deterioration of mechanical strength of membranes by doped acids. Moreover, the prepared membranes exhibit high oxidation stability and low vanadium permeability. The VRFB assembled with the proposed diaphragm displays energy efficiency above 82 % at a current density range of 20 to 120 mA cm⁻². The membrane-based VRFB demonstrates stable performance after over 50 charge–discharge cycles.

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钒氧化还原液流电池用聚四氟乙烯增强咪唑和咪唑功能化聚氯乙烯共混聚合物膜

采用简便的方法制备了一种新型混合聚合物膜，用于钒氧化还原液流电池膜片。首先将聚氯乙烯(PVC)和聚乙烯吡咯烷酮(PVP)以1.2:1的摩尔比共混得到PVC -PVC混合物，然后用1-(3-氨基丙基)-咪唑(APIm)对混合物中的PVC进行功能化。将功能化聚合物浸渍在多孔聚四氟乙烯(PTFE)中以制备膜。所制备的膜对硫酸具有良好的亲和力，主要是由于APIm基团与硫酸分子之间的酸碱相互作用。疏水性聚四氟乙烯的存在限制了掺杂酸对膜机械强度的恶化。此外，制备的膜具有高氧化稳定性和低钒渗透性。与所提出的隔膜组装在一起的VRFB在电流密度范围为20至120 mA cm - 2时显示出82%以上的能量效率。该膜基VRFB在50多次充放电循环后表现出稳定的性能。

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来源期刊

Journal of Electroanalytical Chemistry Chemical Engineering-General Chemical Engineering

CiteScore

7.50

自引率

6.70%

发文量

912

审稿时长

>12 weeks

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.