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Issue 38, 2019
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Enhanced proton conductivity of Nafion-azolebisphosphonate membranes for PEM fuel cells

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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 (Ea) values suggests that both Grotthuss and vehicular mechanisms are involved in the proton conduction across the membrane.

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

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Article information


Submitted
30 Jun 2019
Accepted
23 Aug 2019
First published
26 Aug 2019

New J. Chem., 2019,43, 15249-15257
Article type
Paper

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

F. C. Teixeira, A. I. de Sá, A. P. S. Teixeira and C. M. Rangel, New J. Chem., 2019, 43, 15249
DOI: 10.1039/C9NJ03405F

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