Acid‐Doped Polybenzimidazoles: A New Polymer Electrolyte

Wainright, Jesse S.; Wang, J. ‐T.; Weng, D.; Savinell, Robert F.; Litt, Morton H.

doi:10.1149/1.2044337

Cited by 1,235 publications

(712 citation statements)

References 2 publications

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“…This indicates there is a strong dependence of polymerization process on both doping level and conductivity, and is reiterated by Bai and Ho in their work. 33 Typical doping levels reported in the literature for m-PBI prepared via the conventional organic solvent route are between 6 and 10 mol PA/PBI, 14,15,[17][18][19][20][21] although some films with higher doping levels and poor mechanical properties have been achieved. 52 Average doping levels for s-PBI membranes developed in this work are between 30 and 35 mol PA/PBI, although some membranes retain 40-50 mol PA/PBI.…”

Section: Resultsmentioning

confidence: 99%

Sulfonated Polybenzimidazoles for High Temperature PEM Fuel Cells

2010

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High molecular weight, highly PA-doped s-PBI membranes have been developed with robust mechanical properties and excellent proton conductivities (>0.1 S cm -1 ) at elevated temperatures (>100°C). These membranes show high PA loadings of 30-35 mol PA/PBI, and average tensile stress and strain of 0.804 MPa and 69.64%, respectively. Proton conductivities were dependent on the acid doping level and measured between 0.1 and 0.25 S cm -1 at 180°C, a pronounced increase over most phosphoric acid-doped sulfonated PBI membranes to date. Preliminary fuel cell testing with hydrogen fuel and air or oxygen oxidants was performed at temperatures greater than 100°C without external feed gas humidification and show excellent performance (0.62-0.68 V at 0.2 A cm -2 and 160°C, hydrogen/air; 0.69-0.76 V at 0.2 A cm -2 and 160°C, hydrogen/oxygen). Initial performance stability studies were conducted for ∼3000 h and indicate great promise as high temperature membranes, with a degradation rate of 30 μV h -1 .

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Section: Resultsmentioning

confidence: 99%

Sulfonated Polybenzimidazoles for High Temperature PEM Fuel Cells

2010

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“…Therefore, extensive studies have been focused on developing alternatives to these per fluorosulfonated membranes [3]. In particular, different polymers that adopt the sulfonated aromatic hydrocarbon structure have been tested, including poly(arylene ether sulfone)s [4], poly(ether ether ketone)s [5], poly(sulfide sulfone)s [6], polyimides [7], poly phosphazenes [8] and polybenzimidazoles [9].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and structural characterization of sulfonated polysulfone

et al. 2015

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a b s t r a c tWe describe the synthesis, as well as the electrochemical and structural characterization, of sulfonated polysulfone intended for use in PEM fuel cells. Starting from a commercial polysulfone, we assessed the performance of these prepared ionomers using synthesis protocols compatible with industrial produc tion. The efficiency of the trimethylsilyl chlorosulfonate and chlorosulfonic acid reagents in the sulfo nation process was confirmed by 1 H NMR, FTIR, elemental analysis, chemical titration and thermal analysis (DSC and TGA). Chlorosulfonic acid was the most effective sulfonation reagent. However, based on SEC MALLS, this reagent induced degradation of the backbone that is detrimental to the thermo mechanical stability and lifespan of the membranes. The electrical characterization of the membranes was undertaken using impedance spectroscopy in contact with different HCl aqueous solutions at various temperatures. The activation energies, which ranged from 8.2 to 11 kJ/mol, were in agreement with the prevailing proton vehicular mechanism.

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“…Operating without external humidification not only simplifies balance of plant but also implies single phase, gaseous, transport in the gas diffusion layers (GDL) and flow channels, which makes reactant diffusion processes more facile [3,4]. To date, phosphoric acid-doped polybenzimidazole (PBI) membranes have been among the most successful acid doped membranes for HT-PEMFC applications [11][12][13][14][15][16][17][18][19][20]. PBI outperforms conventional membranes (i.e., Nafion ® ) by self-solvating protons to allow charge migration, hence minimizing the reliance on water for proton transport.…”

Section: Introductionmentioning

confidence: 99%

Application of a Coated Film Catalyst Layer Model to a High Temperature Polymer Electrolyte Membrane Fuel Cell with Low Catalyst Loading Produced by Reactive Spray Deposition Technology

et al. 2015

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Abstract:In this study, a semi-empirical model is presented that correlates to previously obtained experimental overpotential data for a high temperature polymer electrolyte membrane fuel cell (HT-PEMFC). The goal is to reinforce the understanding of the performance of the cell from a modeling perspective. The HT-PEMFC membrane electrode assemblies (MEAs) were constructed utilizing an 85 wt. % phosphoric acid doped Advent TPS ® membranes for the electrolyte and gas diffusion electrodes (GDEs) manufactured byReactive Spray Deposition Technology (RSDT). MEAs with varying ratios of PTFE binder to carbon support material (I/C ratio) were manufactured and their performance at various operating temperatures was recorded. The semi-empirical model derivation was based on the coated film catalyst layer approach and was calibrated to the experimental data by a least squares method. The behavior of important physical parameters as a function of I/C ratio and operating temperature were explored. OPEN ACCESSCatalysts 2015, 5 1674

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Acid‐Doped Polybenzimidazoles: A New Polymer Electrolyte

Cited by 1,235 publications

References 2 publications

Sulfonated Polybenzimidazoles for High Temperature PEM Fuel Cells

Sulfonated Polybenzimidazoles for High Temperature PEM Fuel Cells

Electrochemical and structural characterization of sulfonated polysulfone

Application of a Coated Film Catalyst Layer Model to a High Temperature Polymer Electrolyte Membrane Fuel Cell with Low Catalyst Loading Produced by Reactive Spray Deposition Technology

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