{"title":"基于嵌段共聚物 PBI 膜与强吸酸 Py-PBI 膜段实现高电池性能","authors":"","doi":"10.1016/j.memsci.2024.123111","DOIUrl":null,"url":null,"abstract":"<div><p>Block copolymers show great promise as low-temperature proton exchange membranes (PEMs). However, their potential as high-temperature PEMs has been less explored. In this study, we synthesized a series of segmented block copolymers of polybenzimidazole (PBI), consisting of strongly acid-absorbing Py-PBI segments and fluorine-containing 6FPBI segments, which exhibited significant microphase-separated structures. To counteract the \"plasticization effect\" of phosphoric acid (PA) under high acid doping level (ADL), which can compromise the mechanical strength of PEMs, 3-(2,3-epoxypropyl) propyltrimethoxysilane (KH560) was introduced as a crosslinking agent to strike a balance between the ADL and the mechanical properties. The 5 % KH560–6F<sub>0.72</sub>Py<sub>0.28</sub>-PBI membrane, which features a molar ratio of 6FPBI to Py-PBI structural segments of 0.72:0.28, demonstrates the most obvious microphase separated structure, exhibiting high ADL (29.2) and proton conductivity (165.45 mS cm<sup>−1</sup> at 180 °C). The membrane electrode assembly (MEA) employing the segmented block copolymer membrane achieved a peak power density of 936.9 mW cm<sup>−2</sup> at 160 °C without humidification. This study highlights the significant enhancement of membrane performance achieved by constructing continuous microphase separated structures.</p></div>","PeriodicalId":368,"journal":{"name":"Journal of Membrane Science","volume":null,"pages":null},"PeriodicalIF":8.4000,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Achieving high cell performance based on block copolymer PBI membrane with strong acid absorbing Py-PBI segments\",\"authors\":\"\",\"doi\":\"10.1016/j.memsci.2024.123111\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Block copolymers show great promise as low-temperature proton exchange membranes (PEMs). However, their potential as high-temperature PEMs has been less explored. In this study, we synthesized a series of segmented block copolymers of polybenzimidazole (PBI), consisting of strongly acid-absorbing Py-PBI segments and fluorine-containing 6FPBI segments, which exhibited significant microphase-separated structures. To counteract the \\\"plasticization effect\\\" of phosphoric acid (PA) under high acid doping level (ADL), which can compromise the mechanical strength of PEMs, 3-(2,3-epoxypropyl) propyltrimethoxysilane (KH560) was introduced as a crosslinking agent to strike a balance between the ADL and the mechanical properties. The 5 % KH560–6F<sub>0.72</sub>Py<sub>0.28</sub>-PBI membrane, which features a molar ratio of 6FPBI to Py-PBI structural segments of 0.72:0.28, demonstrates the most obvious microphase separated structure, exhibiting high ADL (29.2) and proton conductivity (165.45 mS cm<sup>−1</sup> at 180 °C). The membrane electrode assembly (MEA) employing the segmented block copolymer membrane achieved a peak power density of 936.9 mW cm<sup>−2</sup> at 160 °C without humidification. This study highlights the significant enhancement of membrane performance achieved by constructing continuous microphase separated structures.</p></div>\",\"PeriodicalId\":368,\"journal\":{\"name\":\"Journal of Membrane Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":8.4000,\"publicationDate\":\"2024-07-20\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Membrane Science\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0376738824007051\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Membrane Science","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0376738824007051","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
Achieving high cell performance based on block copolymer PBI membrane with strong acid absorbing Py-PBI segments
Block copolymers show great promise as low-temperature proton exchange membranes (PEMs). However, their potential as high-temperature PEMs has been less explored. In this study, we synthesized a series of segmented block copolymers of polybenzimidazole (PBI), consisting of strongly acid-absorbing Py-PBI segments and fluorine-containing 6FPBI segments, which exhibited significant microphase-separated structures. To counteract the "plasticization effect" of phosphoric acid (PA) under high acid doping level (ADL), which can compromise the mechanical strength of PEMs, 3-(2,3-epoxypropyl) propyltrimethoxysilane (KH560) was introduced as a crosslinking agent to strike a balance between the ADL and the mechanical properties. The 5 % KH560–6F0.72Py0.28-PBI membrane, which features a molar ratio of 6FPBI to Py-PBI structural segments of 0.72:0.28, demonstrates the most obvious microphase separated structure, exhibiting high ADL (29.2) and proton conductivity (165.45 mS cm−1 at 180 °C). The membrane electrode assembly (MEA) employing the segmented block copolymer membrane achieved a peak power density of 936.9 mW cm−2 at 160 °C without humidification. This study highlights the significant enhancement of membrane performance achieved by constructing continuous microphase separated structures.
期刊介绍:
The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.