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Title: Enhanced proton conductivity of Nafionazolebisphosphonate membranes for PEM 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: Aug-2019
Publisher: The Royal Society of Chemistry and the Centre National de la Recherche Scientifique
Citation: F.C. Teixeira, A.I. de Sá, A.P.S. Teixeira, C.M. Rangel, “Enhanced proton conductivity of Nafion-azolebisphosphonates membranes for PEM fuel cells”, New J. Chem., 43, 15249-15257, 2019.
Abstract: Fuel cells are among the cleaner alternatives of sustainable energy technologies, where their protón exchange membranes continue to be a key component with many challenges and opportunities ahead. In this study, different indazole- and benzotriazolebisphosphonic acids were prepared and incorporated into new Nafion-doped membranes up to a 5 wt% loading. The new membranes were characterised, and their proton conductivities were evaluated using electrochemical impedance spectroscopy. Membranes with a 1 wt% loading showed better proton conductivities than Nafion N-115 at all temperature and under relative humidity conditions studied. In these conditions, the best value was observed for the membrane doped with [hydroxy(1H-indazol-3-yl)methanediyl]bis(phosphonic acid) (BP2), with a proton conductivity of 98 mS cm-1. Activation energy (Ea) values suggests that both Grotthuss and vehicular mechanisms are involved in the proton conduction across the membrane.
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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