Tailoring highly stable anion exchange membranes with graft molecular structure ordering using reversible addition-fragmentation chain transfer polymerization for alkaline fuel cells
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Journal of Membrane Science
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The radiation-induced grafting is used to prepare a variety of anion-exchange membranes (AEM) based on poly
(ethylene-co-tetrafluoroethylene) (ETFE) utilizing a reversible addition-fragmentation chain transfer (RAFT)
agent. The copolymerization process is controlled by the RAFT agent, resulting in AEMs with a restricted molecular weight dispersion. As a result, RAFT-AEMs exhibit decreased water uptake and reduced swelling. A
significant improvement in thermal and mechanical characteristics is evidenced, while the conductivity remains
practically unaltered. Anion-exchange membrane fuel cell (AEMFC) tests revealed that conventional RIG-AEMs
and RAFT-AEMs with low RAFT content (5 wt%) have comparable beginning-of-life performances (~0.95 W
cm− 2
). However, for higher RAFT contents, the performance trends to decrease indicating an imbalance in water
management. Furthermore, short-term stability tests suggest that RAFT-AEMs are able to operate highly stable,
with a conductivity rate loss of 0.05% h− 1
, which represents an improvement of 160% in comparison to conventional RIG-AEM. AFM analysis demonstrated that structural ordering molecular and morphology tailor the
fundamental properties of ETFE-based AEMs, combining enhanced performance and stability for alkaline fuel
cell applications.
Como referenciar
SANTOS, BIANCA P.S.; BARBOSA, ANDREY S.; KODAMA, YASKO; THIAGO, QUEIROZ B. de; SANTIAGO, ELISABETE I. Tailoring highly stable anion exchange membranes with graft molecular structure ordering using reversible addition-fragmentation chain transfer polymerization for alkaline fuel cells. Journal of Membrane Science, v. 687, p. 1-12, 2023. DOI: 10.1016/j.memsci.2023.122071. Disponível em: http://repositorio.ipen.br/handle/123456789/34255. Acesso em: 30 Dec 2025.
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