Paul Majsztrik

Learn More
Water absorption, membrane swelling, and self-diffusivity of water in 1100 equivalent weight Nafion were measured as functions of temperature and water activity. Free volume per water at 80 °C, determined from water uptake and volume expansion data, decreases with water content in the membrane from 12 cm(3)/mol at λ = 0.5 H(2)O/SO(3) to 1.5 cm(3)/mol at λ =(More)
Metal-oxide-recast Nafion composite membranes were studied for operation in hydrogen/oxygen protonexchange membrane fuel cells (PEMFC) from 80 to 130 °C and at relative humidities ranging from 75 to 100%. Membranes of nominal 125 μm thickness were prepared by suspending a variety of metal oxide particles (SiO2, TiO2, Al2O3, and ZrO2) in solubilized Nafion.(More)
The permeation of water through 1100 equivalent weight Nation membranes has been measured for film thicknesses of 51-254 microm, temperatures of 30-80 degrees C, and water activities (a(w)) from 0.3 to 1 (liquid water). Water permeation coefficients increased with water content in Nafion. For feed side water activity in the range 0 < a(w) < 0.8, permeation(More)
Fuel cells efficiently convert fuel (usually hydrogen) directly into DC electricity and are intrinsically nonpolluting. Polymer electrolyte membrane fuel cells incorporate a polymer exchange membrane electrolyte and therefore are lightweight and operate between 60 and 100 C, which makes them ideal candidates for use in automobiles. However, the price of(More)
  • 1