Water sub-diffusion in membranes for fuel cells

Abstract We investigate the dynamics of water confined in soft ionic nano-assemblies, an issue critical for a general understanding of the multi-scale structure-function interplay in advanced materials. We focus in particular on hydrated perfluoro-sulfonic acid compounds employed as electrolytes in...

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Autores principales:	Quentin Berrod, Samuel Hanot, Armel Guillermo, Stefano Mossa, Sandrine Lyonnard
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/08077ea5a1ae447daef91f214fad4c96
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spelling	oai:doaj.org-article:08077ea5a1ae447daef91f214fad4c962021-12-02T12:32:17ZWater sub-diffusion in membranes for fuel cells10.1038/s41598-017-08746-92045-2322https://doaj.org/article/08077ea5a1ae447daef91f214fad4c962017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08746-9https://doaj.org/toc/2045-2322Abstract We investigate the dynamics of water confined in soft ionic nano-assemblies, an issue critical for a general understanding of the multi-scale structure-function interplay in advanced materials. We focus in particular on hydrated perfluoro-sulfonic acid compounds employed as electrolytes in fuel cells. These materials form phase-separated morphologies that show outstanding proton-conducting properties, directly related to the state and dynamics of the absorbed water. We have quantified water motion and ion transport by combining Quasi Elastic Neutron Scattering, Pulsed Field Gradient Nuclear Magnetic Resonance, and Molecular Dynamics computer simulation. Effective water and ion diffusion coefficients have been determined together with their variation upon hydration at the relevant atomic, nanoscopic and macroscopic scales, providing a complete picture of transport. We demonstrate that confinement at the nanoscale and direct interaction with the charged interfaces produce anomalous sub-diffusion, due to a heterogeneous space-dependent dynamics within the ionic nanochannels. This is irrespective of the details of the chemistry of the hydrophobic confining matrix, confirming the statistical significance of our conclusions. Our findings turn out to indicate interesting connections and possibilities of cross-fertilization with other domains, including biophysics. They also establish fruitful correspondences with advanced topics in statistical mechanics, resulting in new possibilities for the analysis of Neutron scattering data.Quentin BerrodSamuel HanotArmel GuillermoStefano MossaSandrine LyonnardNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-14 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Quentin Berrod Samuel Hanot Armel Guillermo Stefano Mossa Sandrine Lyonnard Water sub-diffusion in membranes for fuel cells
description	Abstract We investigate the dynamics of water confined in soft ionic nano-assemblies, an issue critical for a general understanding of the multi-scale structure-function interplay in advanced materials. We focus in particular on hydrated perfluoro-sulfonic acid compounds employed as electrolytes in fuel cells. These materials form phase-separated morphologies that show outstanding proton-conducting properties, directly related to the state and dynamics of the absorbed water. We have quantified water motion and ion transport by combining Quasi Elastic Neutron Scattering, Pulsed Field Gradient Nuclear Magnetic Resonance, and Molecular Dynamics computer simulation. Effective water and ion diffusion coefficients have been determined together with their variation upon hydration at the relevant atomic, nanoscopic and macroscopic scales, providing a complete picture of transport. We demonstrate that confinement at the nanoscale and direct interaction with the charged interfaces produce anomalous sub-diffusion, due to a heterogeneous space-dependent dynamics within the ionic nanochannels. This is irrespective of the details of the chemistry of the hydrophobic confining matrix, confirming the statistical significance of our conclusions. Our findings turn out to indicate interesting connections and possibilities of cross-fertilization with other domains, including biophysics. They also establish fruitful correspondences with advanced topics in statistical mechanics, resulting in new possibilities for the analysis of Neutron scattering data.
format	article
author	Quentin Berrod Samuel Hanot Armel Guillermo Stefano Mossa Sandrine Lyonnard
author_facet	Quentin Berrod Samuel Hanot Armel Guillermo Stefano Mossa Sandrine Lyonnard
author_sort	Quentin Berrod
title	Water sub-diffusion in membranes for fuel cells
title_short	Water sub-diffusion in membranes for fuel cells
title_full	Water sub-diffusion in membranes for fuel cells
title_fullStr	Water sub-diffusion in membranes for fuel cells
title_full_unstemmed	Water sub-diffusion in membranes for fuel cells
title_sort	water sub-diffusion in membranes for fuel cells
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/08077ea5a1ae447daef91f214fad4c96
work_keys_str_mv	AT quentinberrod watersubdiffusioninmembranesforfuelcells AT samuelhanot watersubdiffusioninmembranesforfuelcells AT armelguillermo watersubdiffusioninmembranesforfuelcells AT stefanomossa watersubdiffusioninmembranesforfuelcells AT sandrinelyonnard watersubdiffusioninmembranesforfuelcells
_version_	1718394077672636416

Water sub-diffusion in membranes for fuel cells

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