Anion exchange membrane fuel cell: New insights and advancements

Vedarajan, Raman; Balaji, Ramachandran; Ramya, K.

doi:10.1002/wene.466

Cited by 10 publications

(1 citation statement)

References 184 publications

(173 reference statements)

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“…Mesmo nos casos em que a ROH não é o processo redox dominante [133], isso não significa que a ROH está isenta de problemas. Por exemplo, a ROH em meio alcalino funciona de forma menos efetiva quando comparada ao meio ácido ao utilizar a Pt, e pode significar um resultado de densidade de corrente de duas ordens de grandezas menor [134]. De acordo com Ramaswamy et al [135], tanto a ROH quanto RRO sofrem mudanças semelhantes na energia de ligação das espécies oxigenadas.…”

Section: Eletrocatalisador Para Rohunclassified

Membranas de troca aniônica baseadas em polietileno aplicadas como eletrólito polimérico alcalino em dispositivos eletroquímicos

Barbosa

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Dedico esta tese de doutorado à minha querida irmã (in memoriam) que, mesmo ausente fisicamente entre nós, tenho plena certeza de que tem olhado por mim e me protegido desde sua partida. Esta tese é a garantia de que alcancei o mais alto grau de formação educacional, conforme prometido. Além disso, dedico este trabalho à Ana Laura G.Biancolli, agradecendo por todo esforço, coragem, apoio e dedicação que foram fundamentais no desenvolvimento desta tese. Sou grato e tenho orgulho da amizade construída durante meu doutoramento. Tenho plena convicção de que você estará fortalecida ao final desse processo tortuoso."Science is a collaborative effort.The combined results of several people working together is often much more effective than could be that of an individual scientist working alone"

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Section: Eletrocatalisador Para Rohunclassified

Membranas de troca aniônica baseadas em polietileno aplicadas como eletrólito polimérico alcalino em dispositivos eletroquímicos

Barbosa

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Urea‐based construction of hydrogen bonding networks for poly(biphenyl alkylene)s anion exchange membrane for fuel cells

Gu,

Chi,

Dong

et al. 2024

Carbon Neutralization

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In recent decades, the “trade‐off” problem of anion exchange membranes (AEMs) has been a concern. Herein, a series of urea‐based multication poly(biphenyl alkylene)s AEMs are prepared by obtaining an ether bond‐free backbone through ultra‐strong acid catalysis, grafting it with multication side chains, and then by accessing urea‐based groups in different ratios. By accessing the urea group, noncovalent bonds are used to link the molecules to act as cross‐links, giving them solubility that chemical cross‐links do not have. The PBTA‐DQA‐35U membrane possessed the highest ionic conductivity of 62.43 mS/cm. Compared with the PBTA‐DQA membrane (80°C, WU = 20.45%, SR = 17.67%), the PBTA‐DQA‐25U membrane showed an increase in water uptake but not much change in swelling (WU = 30.23%, SR = 19.36%), which was attributed to the fact that the hydrophilic urea groups provide cation transport sites while hydrogen bonding inhibits membrane swelling. The PBTA‐DQA‐35U ionic conductivity is retained above 75% after 960 h of alkali stability testing. The power density of the MEA device assembled using PBTA‐DQA‐35U membrane is 421.78 mW/cm2.

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Anion exchange membrane with enhanced alkaline stability through radiation grafting of ETFE for solid polymer electrolytes

Govind,

Rattan,

Ameduri

et al. 2024

Polymer Engineering & Sci

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Solid polymer electrolyte membranes are considered as the nub of many electrochemical devices. Given the climate crisis and related concerns, the evolution of new membrane materials to support the sustainable systems is inevitable. Building on recent advances with the radiation technique and polymer chemistry, herein, anion exchange membranes (AEMs), ETFE‐g‐1VIm/4VP, were fabricated through graft copolymerization of vinyl heterocyclic monomer binary mixture, such as 1‐vinylimidazole (1‐VIm) and 4‐vinylpyridine (4‐VP) onto ethylene tetrafluoroethylene (ETFE), a main polymer backbone without aryl ether bonds. The grafting reaction was achieved at 60°C and then followed by quaternization as a subsequent step. The effects of various reaction grafting conditions were investigated. The ETFE‐g‐1VIm/4VP AEM were characterized w.r.t the morphological and structural features. The dense surface of the grafted membranes is proved by field emission‐scanning electron microscopy (FE‐SEM) images, which also show that the vinyl entities are clearly distributed in the prepolymer, which may lead to a continuous ion transport channel. AEMs processed from the highest graft yield showed good hydroxide conductivity at 90°C, reaching 16.9 mS/cm due to the presence of more transport sites. The same membrane has a relatively good alkaline stability, which is studied through weight percentage method and FT‐IR. Hence, we assume that the introduction of multi‐cationic moieties, pyridinium and imidazolium, contributes to the performance of anion exchange membranes and makes a perfect balance, especially the hydrophilicity and hydrophobicity. These data highlight the potential of the copolymer as an anion exchange membrane for wide spectra of electrochemical applications.Highlights AEMs based on ETFE‐g‐1VIm/4VP are developed via radiation grafting. The membrane exhibits remarkable alkaline stability. FT‐IR, SEM, and weight percentage methods were used to prove the alkaline stability. The membrane has the potential to be used for different electrochemical applications.

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Anion exchange membrane fuel cell: New insights and advancements

Cited by 10 publications

References 184 publications

Membranas de troca aniônica baseadas em polietileno aplicadas como eletrólito polimérico alcalino em dispositivos eletroquímicos

Membranas de troca aniônica baseadas em polietileno aplicadas como eletrólito polimérico alcalino em dispositivos eletroquímicos

Urea‐based construction of hydrogen bonding networks for poly(biphenyl alkylene)s anion exchange membrane for fuel cells

Anion exchange membrane with enhanced alkaline stability through radiation grafting of ETFE for solid polymer electrolytes

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