Disentangling water, ion and polymer dynamics in an anion exchange membrane - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Nature Materials Année : 2022

Disentangling water, ion and polymer dynamics in an anion exchange membrane

Adam J. Clancy
Markus Appel
Jean-Marc Zanotti
Paul F. Mcmillan
  • Fonction : Auteur
  • PersonId : 1024104

Résumé

Semipermeable polymeric anion exchange membranes are essential for separation, filtration and energy conversion technologies including reverse electrodialysis systems that produce energy from salinity gradients, fuel cells to generate electrical power from the electrochemical reaction between hydrogen and oxygen, and water electrolyser systems that provide H$_2$ fuel. Anion exchange membrane fuel cells and anion exchange membrane water electrolysers rely on the membrane to transport OH$^−$ ions between the cathode and anode in a process that involves cooperative interactions with H$_2$O molecules and polymer dynamics. Understanding and controlling the interactions between the relaxation and diffusional processes pose a main scientific and critical membrane design challenge. Here quasi-elastic neutron scattering is applied over a wide range of timescales (10$^0$–10$^3$ ps) to disentangle the water, polymer relaxation and OH$^−$ diffusional dynamics in commercially available anion exchange membranes (Fumatech FAD-55) designed for selective anion transport across different technology platforms, using the concept of serial decoupling of relaxation and diffusional processes to analyse the data. Preliminary data are also reported for a laboratory-prepared anion exchange membrane especially designed for fuel cell applications.
Fichier principal
Vignette du fichier
Disentangling water_ ion and polymer dynamics in an anion exchange membrane.pdf (33.71 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03767706 , version 1 (23-09-2022)

Identifiants

Citer

Fabrizia Foglia, Quentin Berrod, Adam J. Clancy, Keenan Smith, Gérard Gebel, et al.. Disentangling water, ion and polymer dynamics in an anion exchange membrane. Nature Materials, 2022, 21, pp.555 - 563. ⟨10.1038/s41563-022-01197-2⟩. ⟨hal-03767706⟩
37 Consultations
8 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More