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Title: Nafion phosphonic acid composite membranes for proton exchange membranes fuel cells
Authors: Teixeira, António P. S.
Teixeira, Fátima C.
Sá, Ana I. de
Rangel, C. M.
Keywords: Proton exchange membranes
Fuel cells
Phosphonic acids
Proton conductivity
Issue Date: May-2019
Publisher: Elsevier B.V.
Citation: F.C. Teixeira, A.I. de Sá, A.P.S. Teixeira, C.M. Rangel, Nafion phosphonic acid composite membranes for proton Exchange membranes fuel cells, Appl. Surf. Sci., 487, 889 -897, 2019.
Abstract: In this work, new doped Nafion membranes with enhanced proton conductivity were prepared to be used as proton exchange membranes in fuel cells. New dopants derived from arylmono- or bisphosphonic acid were prepared and incorporated into the new membranes using impregnation or casting methods. Proton conductivities were assessed by Electrochemical Impedance Spectroscopy (EIS), at different temperatures and relative humidity (RH) conditions, in order to evaluate the influence of the structure and the method of the preparation on proton transport. The membranes prepared by casting showed higher proton conductivities than commercial Nafion membrane at all temperatures and relative humidity conditions studied. The [1,4-phenylenebis(hydroxymethanetriyl)]tetrakis(phosphonic acid) (BP2) showed the best proton conductivity with a value of 87 mS cm-1. The values obtained for the activation energy (Ea) for proton conduction suggests that transport occurs via both Grotthuss and vehicular mechanisms.
Type: article
Appears in Collections:QUI - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
CQE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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