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Polybenzimidazole based nanocomposite membranes with enhanced proton conductivity for high temperature PEM fuel cells
Date
2017-01-26
Author
Ozdemir, Yagmur
Uregen, Nurhan
DEVRİM, YILSER
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In this study, phosphoric acid doped PBI nanocomposite membranes were prepared by dispersion of various amounts of inorganic nanoparticles in PBI polymer followed by phosphoric acid (H3PO4) doping for high temperature proton exchange membrane fuel cells (HT-PEMFC). All of the PBI composite membranes were cast from the same FBI polymer with the same molecular weight. Titanium dioxide (TiO2), silicon dioxide (SiO2) and inorganic proton conductor zirconium phosphate (ZrP) were used as inorganic fillers. The PBI based composite membranes were characterized in terms of their acid uptake and acid leaching properties, mechanical properties, chemical stabilities in N-N Dimethylacetamide (DMAc) and impedance analyses. Thermal gravimetric analysis confirmed the improved thermal stability of the PBI composite membranes. The existence of inorganic fillers was improved the acid retention capability. Electrochemical Impedance Spectroscopy (EIS) showed that the introduction of 5 wt. % SiO2 or 5 wt. % ZrP helps to increase proton conductivity. The composite membrane with TiO2 retained low conductivity values than pristine PBI and this is a result of its non-uniform membrane structure. The highest proton conductivity of 0.200 S/cm was obtained for PBI/ZrP composite membrane with the highest value of H3PO4 doping level. Nyquist plots are drawn for all the membranes at different temperatures and the plots showed good fit with Randel's circuit. As a result the experimental results suggested that the PBI based composite membranes may be a promising electrolyte used in HT-PEMFC. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Subject Keywords
Membrane fuel cells
,
High temperature proton exchange
,
Zirconium phosphate
,
Silicon dioxide
,
Titanium dioxide
,
Composite membrane
,
Polybenzimidazole
URI
https://hdl.handle.net/11511/66331
Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
DOI
https://doi.org/10.1016/j.ijhydene.2016.04.132
Collections
Graduate School of Natural and Applied Sciences, Article
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Y. Ozdemir, N. Uregen, and Y. DEVRİM, “Polybenzimidazole based nanocomposite membranes with enhanced proton conductivity for high temperature PEM fuel cells,”
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
, pp. 2648–2657, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/66331.