Functionally graded cathode catalyst layers for polymer electrolyte fuel cells. II, Experimental study of the effect of nafion distribution

Par Conseil national de recherches du Canada

DOI	Trouver le DOI : https://doi.org/10.1149/1.1904990
Auteur	Rechercher : Xie, Zhong¹; Rechercher : Navessin, Titichai¹; Rechercher : Shi, Ken¹; Rechercher : Chow, Robert¹; Rechercher : Wang, Qianpu¹; Rechercher : Song, Datong¹; Rechercher : Andreaus, Bernhard¹; Rechercher : Eikerling, Michael¹; Rechercher : Liu, Zhongsheng¹; Rechercher : Holdcroft, Steven¹
Affiliation	Conseil national de recherches du Canada. Institut d'innovation en piles à combustible du CNRC
Format	Texte, Article
Sujet	polymers; electrochemical electrodes; proton exchange membrane fuel cell; functionally graded materials; catalysts; diffusion; voltammetry (chemical analysis); electrochemical impedance spectroscopy; ionic conductivity; porosity; polymer structure; chemical exchanges
Résumé	Gas diffusion electrodes (GDEs) containing a graded distribution of Nafion were prepared and characterized, and their performance as fuel cell cathodes compared to GDEs possessing a uniform distribution of Nafion. Cyclic voltammetry, electrochemical impedance spectroscopy (EIS), and porosimetry are used to characterize the variations in electrochemical properties, ionic conductivity, and microstructures. The cathodic performance was improved over uniform electrodes at intermediate and high levels of polarization when the Nafion content in the GDE was higher toward the catalyst layer/membrane interface and lower toward the catalyst layer/carbon paper interface since this maximizes proton transport in the GDE in the region of greatest ion flux and maximizes porosity in the region of greatest gaseous flux, respectively. Fuel cell performance is much poorer when the gradient of Nafion content is reversed, i.e., highest at the catalyst layer/carbon paper interface since this distribution disfavors proton and gas transport in the regions where they need to be maximized.
Date de publication	2005
Maison d’édition	Electrochemical Society
Dans	Journal of The Electrochemical Society 152, nº 6 : A1171–A1179.
Langue	anglais
Publications évaluées par des pairs	Oui
Numéro NPARC	23002001
Exporter la notice	Exporter en format RIS
Signaler une correction	Signaler une correction (s'ouvre dans un nouvel onglet)
Identificateur de l’enregistrement	84db6b56-1bd2-40cb-91c5-b3cbcc01db94
Enregistrement créé	2017-07-14
Enregistrement modifié	2020-04-07

Date de modification :: 2024-12-21