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Download Electrochemical Polymer Electrolyte Membranes by Jianhua Fang, Jinli Qiao, David P. Wilkinson, Jiujun Zhang PDF

By Jianhua Fang, Jinli Qiao, David P. Wilkinson, Jiujun Zhang

Electrochemical Polymer Electrolyte Membranes covers PEMs from basics to functions, describing their constitution, houses, characterization, synthesis, and use in electrochemical strength garage and solar power conversion applied sciences. that includes chapters authored by means of best specialists from academia and undefined, this authoritative textual content:

  • Discusses state of the art methodologies in PEM fabric choice and fabrication
  • Points out very important demanding situations in constructing PEMs and recommends mitigation recommendations to enhance PEM performance
  • Analyzes the present integration of PEMs with fundamental strength units and explores learn tendencies for the following new release of PEMs

Electrochemical Polymer Electrolyte Membranes offers a scientific assessment of the cutting-edge of PEM improvement, making the ebook a helpful source for researchers, scholars, business pros, and manufacturers.

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Mixture of methanol [MeOH] and tetrahydrofuran [THF]). Both the proton conductivity and methanol permeability increased with increasing the degree of sulfonation and the proton conductivity. In summary, the aforementioned reports demonstrated that the backbones of the aliphatic and aromatic SHCPEs are less hydrophobic and the sulfonic acid groups of the aliphatic and aromatic SHCPEs are less acidic and less polar than those of the PFSIs [88–90]. The aromatic SHCPEs exhibit a lesser degree of phase separation between the hydrophilic and hydrophobic domain phase than the PFSIs, due to the more rigid aromatic hydrocarbon backbones and the shorter sulfonated side chains of the aromatic SHCPEs [88].

The membranes also show good mechanical properties, excellent conductivities, and long-term stability when operating at temperatures over 150°C. The solgel transition is induced by the hydrolysis of the PPA solvent. PPA (a good solvent for PBI) is converted to H3PO4 (a poor solvent of PBI) via a hydrolysis reaction following the absorption of moisture during the membrane postcasting process. The in situ PPA hydrolysis process was confirmed with a 31P spectroscopy study [213]. 2 Conducting Mechanism of PBI Doped with H3PO4 Membranes H3PO4 molecules act as proton carriers in the PBI/H3PO4 series membranes.

207], Rikakawa and Sanui [208], and Mader et al. [209] and Chandan et al. [210]. These modifications include (1) introducing sulfonated or phosphonated groups on PBI either by substituting –OSO2H or –OPO3H2 groups directly on the backbone of PBI or by grafting –R–OSO2H or –R–OPO3H2 (where R is an alkyl or an aryl group) on the –NH groups of PBI, (2) hybridizing the PBI membrane with Inor-NPs, (3) introducing interpolymer cross-links among the PBI 36 Electrochemical Polymer Electrolyte Membranes polymer chains, and (4) reinforcing the membrane with high-mechanical-strength porous supporting films.

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