Fully Aromatic Copolyethers for High Temperature Polymer Electrolyte Membrane Fuel Cells

Daletou, Maria K.; Geormezi, Maria; Pefkianakis, Elefterios K.; Morfopoulou, Christina; Kallitsis, Joannis K.

doi:10.1002/fuce.200900032

Cited by 21 publications

(15 citation statements)

References 35 publications

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“…Nevertheless, we also focus on understanding how structural variations may alter and most importantly improve the final polymeric properties. For that reason, we synthesized and studied new aromatic polyethersulfones‐bearing pyridine polar main chain groups and phenyl, p‐ tolyl or carboxyl side groups, which are directly comparable to previous copolyethers that have proved efficient polyelectrolytes for PEMFCs 19–27…”

Section: Resultsmentioning

confidence: 99%

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The effect of structural variations on aromatic polyethers for high‐temperature PEM fuel cells

Morfopoulou

Andreopoulou

Kallitsis

2011

J. Polym. Sci. A Polym. Chem.

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Three series of new aromatic polyether sulfones bearing phenyl, p-tolyl or carboxyl side groups, respectively, and polar pyridine main chain groups were developed. Most of the polymeric materials presented high molecular weights and excellent solubility in common organic solvents. More importantly, they formed stable, self-standing membranes that were thoroughly characterized in respect to their thermal, mechanical and oxidative stability, their phosphoric acid doping ability and ionic conductivity. Particularly, the copolymers bearing side p-tolyl or carboxyl groups fulfill all necessary requirements for application as proton electrolyte membranes in high temperature fuel cells, which are glass transition temperatures higher than 220 C, thermal stability up to 400 C, oxidative stability, high doping levels (DLs) and proton conductivities of about 0.02 S/cm. Initial single fuel cell results at high temperatures, 160 C or 180 C, using a copolymer bearing p-tolyl side groups with a relatively low DLs around 200 wt % and dry H 2 / Air feed gases, revealed efficient power generation with a current density of 0.5 A/cm 2 at 500 mV. V C 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: [4325][4326][4327][4328][4329][4330][4331][4332][4333][4334] 2011

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Section: Resultsmentioning

confidence: 99%

“…Thus, such polyethers present increased phosphoric acid doping levels (DLs) and high ionic conductivities in the range of 10 −2 S/cm. More importantly, they present excellent thermal and oxidative stabilities, and they have been effectively used in polymer electrolyte fuel cells operating at temperatures even up to 200 °C 22–27…”

Section: Introductionmentioning

confidence: 99%

The effect of structural variations on aromatic polyethers for high‐temperature PEM fuel cells

Morfopoulou

Andreopoulou

Kallitsis

2011

J. Polym. Sci. A Polym. Chem.

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“…However, on the decreasing scan of temperatures, an obvious increasing trend of conductivity with temperature can be observed. What is more important is that over the whole temperature range, PPy 60 TMeDS 40 PhS exhibits higher conductivities compared to PPy 60 TMeDPhS, which reflects the effect of structure on conductivity [33] and is indicative of the improvement of the obtained morphology toward a facilitated proton conduction. During fuel cell operation, water is generated at the cathode and has been found to contribute to the conduction mechanism [38,73].…”

Section: Proton Conductivitymentioning

confidence: 92%

“…The materials showed low doping levels with phosphoric acid, which greatly improved upon sulfonation. Another interesting approach is based on the use of pyridine containing aromatic polyethers [30][31][32][33]. The presence of the polar pyridine moieties in the main chain enables them to form complexes with strong acids and result in membranes with high proton conductivities in the range of 10 -2 S cm -1 .…”

Section: Introductionmentioning

confidence: 99%

Sulfonated Aromatic Polyethers Containing Pyridine Units as Electrolytes for High Temperature Fuel Cells

Καλαμαράς¹,

Daletou²,

Gregoriou³

et al. 2011

Fuel Cells

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Novel sulfonated copolymers bearing main chain pyridine units have been synthesized for use as electrolytes in high temperature proton exchange membrane fuel cells (PEMFCs). The aim was to combine the excellent thermomechanical properties and high conductivity values after doping with phosphoric acid of these materials with the ability of the sulfonic groups to absorb and retain water and finally to examine the effect on the proton conduction ability. The resulted copolymers showed excellent film forming properties, mechanical integrity, and high glass transition temperatures (Tg > 300 °C). The Tg of the sulfonated copolymers is strongly affected by the sulfonated group content in the polymer backbone due to the acid base interactions of the pyridine and sulfonated groups. Furthermore, the membranes exhibited remarkable oxidative stability and presented proton conductivities in the range of 10–2 S cm–1.

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“…Pyridine based membranes such as Advent Technologies TPS membrane have also been investigated for HT-PEMFC applications [10][11][12][13][14][15][16]. These membranes exhibit glass transition temperatures of~270 …”

Section: High Temperature Polymer Electrolyte Membranesmentioning

confidence: 99%

Catalyst, Membrane, Free Electrolyte Challenges, and Pathways to Resolutions in High Temperature Polymer Electrolyte Membrane Fuel Cells

2017

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High temperature polymer electrolyte membrane fuel cells (HT-PEMFCs) are being studied due to a number of benefits offered versus their low temperature counterparts, including co-generation of heat and power, high tolerance to fuel impurities, and simpler system design. Approximately 90% of the literature on HT-PEM is related to the electrolyte and, for the most part, these electrolytes all use free phosphoric acid, or similar free acid, as the ion conductor. A major issue with using phosphoric acid based electrolytes is the free acid in the electrodes. The presence of the acid on the catalyst sites leads to poor oxygen activity, low solubility/diffusion, and can block electrochemical sites through phosphate adsorption. This review will focus on these issues and the steps that have been taken to alleviate these obstacles. The intention is this review may then serve as a tool for finding a solution path in the community.

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Fully Aromatic Copolyethers for High Temperature Polymer Electrolyte Membrane Fuel Cells

Cited by 21 publications

References 35 publications

The effect of structural variations on aromatic polyethers for high‐temperature PEM fuel cells

The effect of structural variations on aromatic polyethers for high‐temperature PEM fuel cells

Sulfonated Aromatic Polyethers Containing Pyridine Units as Electrolytes for High Temperature Fuel Cells

Catalyst, Membrane, Free Electrolyte Challenges, and Pathways to Resolutions in High Temperature Polymer Electrolyte Membrane Fuel Cells

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