Home > Mathematics and Science Textbooks > Chemistry > Fluorine-Containing Polybenzimidazoles for High Temperature Polymer Electrolyte Membrane Fuel Cell Applications.: (English)
Fluorine-Containing Polybenzimidazoles for High Temperature Polymer Electrolyte Membrane Fuel Cell Applications.: (English)

Fluorine-Containing Polybenzimidazoles for High Temperature Polymer Electrolyte Membrane Fuel Cell Applications.: (English)

          
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About the Book

Polymer electrolyte membrane fuel cells (PEMFC), also called proton exchange membrane fuel cells, have increasingly become the most promising candidates as the zero-emission power sources for transportation, stationary cogeneration and portable applications. In particular, high temperature polymer electrolyte membranes operational above 120C without humidification offer many advantages including fast electrode kinetics, high tolerance to fuel impurities and simple thermal and water management systems. Phosphoric acid doped polybenzimidazole (PBI) is the most promising candidate for the high temperature polymer electrolyte membranes. A hexafluoroisopropylidene-containing polybenzimidazole (6F-PBI) was synthesized using polyphosphoric acid (PPA) as both the polycondensation agent and the polymerization solvent. The use of newly developed polymerization conditions produced high molecular weight polymer. The resulting polymer showed excellent thermal and chemical stability, and high solubility. The PPA process was used to prepare the phosphoric acid doped 6F-PBI membranes. These membranes showed higher phosphoric acid doping levels, higher mechanical properties, and higher proton conductivities than the membranes prepared by the conventional membrane fabrication processes. The fuel cells with phosphoric acid doped 6F-PBI membranes showed good performance and high CO tolerance. Another fluorine-containing PBI (perfluorocyclobutyl containing polybenzimidazoles, PFCB-PBI) was synthesized in phosphorous pentoxide/methanesulfonic acid (PPMA). PPMA was used as reaction medium to replace PPA for its high monomer solubility. High molecular weight polymer was achieved with the optimized monomer/solvent ratio, polymerization temperature, and polymerization time. The resulting polymer showed good thermal and chemical stability, high solubility. Several different membrane preparation processes were investigated. A modified PPA process was developed to produce the phosphoric acid doped membranes. The mechanical properties of these membranes were sufficiently strong to fabricate into membrane electrode assemblies. The re-dissolution of PFCB-PBI in phosphoric acid at temperatures above 140C limited the operation of fuel cells based on phosphoric acid doped PFCB-PBI membranes. The incorporation of fluorine-containing PBIs into high temperature PEMFC electrode was conducted via four different methods: bilayer PBI membrane, casting PBI/PPA solution onto the electrodes, spraying PBI/DMAc solution onto the electrodes, mixing PBIs in the catalyst ink. The performances of fuel cells with bilayer membranes showed that 6F-PBI improved the electrode performance. The higher performances of fuel cells with 6F-PBI/PPA coated cathodes compared to the fuel cell with PPA coated cathodes and regular electrode showed the effects of eliminating the membrane-membrane interface and also clearly verified the enhancement of 6F-PBI on the fuel cell electrode performance. Cyclic voltammetry explained this enhancement of 6F-PBI on the fuel cell electrode performance. There was a significant increase of greater than 20% in the electrochemical active area of the 6F-PBI/PPA coated electrode compared to the PPA coated electrode and regular electrode. It was postulated that the incorporation of 6F-PBI in the electrodes produced a better and more stable distribution of phosphoric acid surrounding the catalyst which was not present in the regular and PPA coated electrodes. Spray coating of PBI/DMAc solutions onto the regular electrodes was also investigated as a method to alter the electrode structure. Electrochemical impedance spectroscopy was conducted to explore the...


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Product Details
  • ISBN-13: 9781244018600
  • Publisher: Proquest, Umi Dissertation Publishing
  • Publisher Imprint: Proquest, Umi Dissertation Publishing
  • Height: 254 mm
  • No of Pages: 192
  • Series Title: English
  • Weight: 390 gr
  • ISBN-10: 1244018600
  • Publisher Date: 01 Sep 2011
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 13 mm
  • Width: 203 mm


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Fluorine-Containing Polybenzimidazoles for High Temperature Polymer Electrolyte Membrane Fuel Cell Applications.: (English)
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Fluorine-Containing Polybenzimidazoles for High Temperature Polymer Electrolyte Membrane Fuel Cell Applications.: (English)
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