New bio-polymeric membranes composed of alginate-carrageenan to be applied as polymer electrolyte membranes for DMFC Articles uri icon

authors

  • PASINI CABELLO, S.D.
  • MOLLÁ ROMANO, SERGIO
  • OCHOA, N.A.
  • MARCHESE, J.
  • GIMENEZ, E.
  • COMPAÑ, VICENTE

publication date

  • November 2014

start page

  • 345

end page

  • 355

volume

  • 265

International Standard Serial Number (ISSN)

  • 0378-7753

Electronic International Standard Serial Number (EISSN)

  • 1873-2755

abstract

  • Novel polyelectrolyte membranes were prepared from pure solutions of alginate (Alg), carrageenan (Car) and their mixtures. The films were crosslinked and sulfonated and then, characterized by several techniques: ionic exchange capacity (IEC), water uptake, mechanical thermal properties, and also functional properties such as methanol permeability and proton conductivity. The results show that Alg/Car membranes have a ductile behavior. Low carrageenan concentrations have a weak thermoprotective effect, which slightly delays both Tg and Tm of prepared membranes. The methanol permeability of Alg/Car membranes increase with the carrageenan content varying from 0.55 × 10−6 cm2 s−1 for Alg/Car 100/00 to 4.89 × 10−6 cm2 s−1 for Alg/Car 80/20. The Proton conductivities of the membranes increase with the carrageenan content from 9.79 × 10−3 S cm−1 for Alg/Car 100/00 until 3.16 × 10−2 S cm−1 for Alg/Car 80/20 at 90 °C. Finally the proton transfer mechanism is discussed in terms of the conductivity activation energy and the dependence of the proton diffusion coefficient with the temperature has been studied.

keywords

  • bio-polymeric membranes; polymer electrolyte membrane; conductivity; methanol permeability; dmfc