{"title":"Fluorinated poly(p-triphenylene isatin) anion exchange membranes based on hydrophilic hydroxyl side chain modulation for fuel cells","authors":"","doi":"10.1016/j.jechem.2024.09.008","DOIUrl":null,"url":null,"abstract":"<div><div>The development of alkaline fuel cells is moving forward at an accelerated pace, and the application of ether-free bonded polymers to anion exchange membranes (AEMs) has been widely investigated. However, the question of the “trade-off” between AEM ionic conductivity and dimensional stability remains difficult. The strategy of inducing microphase separation to improve the performance of AEM has attracted much attention recently, but the design of optimal molecular structures is still being explored. Here, this work introduced different ratios of 3-bromo-1,1,1-trifluoroacetone (<em>x</em> = 40, 50, and 60) into the main chain of poly(p-terphenylene isatin). Because fluorinated groups have excellent hydrophobicity, hydrophilic hydroxyl-containing side chains are introduced to jointly adjust the formation of phase separation structure. The results show that PTI-PTF<sub>50</sub>-NOH AEM with the appropriate fluorinated group ratio has the best ionic conductivity and alkali stability under the combined effect of both. It has an ionic conductivity of 133.83 mS cm<sup>−1</sup> at 80 °C. In addition, the OH<sup>−</sup> conductivity remains at 89% of the initial value at 80 °C and 3 M KOH for 1056 h of immersion. The cell polarization curve based on PTI-PTF<sub>50</sub>-NOH shows a power density of 734.76 mW cm<sup>−2</sup> at a current density of 1807.7 mA cm<sup>−2</sup>.</div></div>","PeriodicalId":15728,"journal":{"name":"Journal of Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":13.1000,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Energy Chemistry","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2095495624006296","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Energy","Score":null,"Total":0}
引用次数: 0
Abstract
The development of alkaline fuel cells is moving forward at an accelerated pace, and the application of ether-free bonded polymers to anion exchange membranes (AEMs) has been widely investigated. However, the question of the “trade-off” between AEM ionic conductivity and dimensional stability remains difficult. The strategy of inducing microphase separation to improve the performance of AEM has attracted much attention recently, but the design of optimal molecular structures is still being explored. Here, this work introduced different ratios of 3-bromo-1,1,1-trifluoroacetone (x = 40, 50, and 60) into the main chain of poly(p-terphenylene isatin). Because fluorinated groups have excellent hydrophobicity, hydrophilic hydroxyl-containing side chains are introduced to jointly adjust the formation of phase separation structure. The results show that PTI-PTF50-NOH AEM with the appropriate fluorinated group ratio has the best ionic conductivity and alkali stability under the combined effect of both. It has an ionic conductivity of 133.83 mS cm−1 at 80 °C. In addition, the OH− conductivity remains at 89% of the initial value at 80 °C and 3 M KOH for 1056 h of immersion. The cell polarization curve based on PTI-PTF50-NOH shows a power density of 734.76 mW cm−2 at a current density of 1807.7 mA cm−2.
期刊介绍:
The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies.
This journal focuses on original research papers covering various topics within energy chemistry worldwide, including:
Optimized utilization of fossil energy
Hydrogen energy
Conversion and storage of electrochemical energy
Capture, storage, and chemical conversion of carbon dioxide
Materials and nanotechnologies for energy conversion and storage
Chemistry in biomass conversion
Chemistry in the utilization of solar energy