Enhanced proton conductivity of Nafion-azolebisphosphonate membranes for PEM fuel cells

Teixeira, Fatima; de Sá, A.I.; Teixeira, António P. S.; Rangel, C. M.

http://hdl.handle.net/10400.9/3199

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Authors

Teixeira, Fatima

de Sá, A.I.

Teixeira, António P. S.

Rangel, C. M.

Abstract(s)

ABSTRACT: Fuel cells are among the cleaner alternatives of sustainable energy technologies, where their proton 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 (E-a) values suggests that both Grotthuss and vehicular mechanisms are involved in the proton conduction across the membrane.

Keywords

Fuel cells Polymer electrolyte membrane PEM Proton exchange membrane

URI

http://hdl.handle.net/10400.9/3199

Citation

Teixeira, Fátima C... [et.al.] - Enhanced proton conductivity of Nafion-azolebisphosphonate membranes for PEM fuel cells. In: New Journal of Chemistry, 2019, Vol. 43, p. 15249-15257