TY - JOUR
T1 - NMR characterization of composite polymer membranes for low-humidity PEM fuel cells
AU - Nicotera, Isabella
AU - Zhang, Tao
AU - Bocarsly, Andrew Bruce
AU - Greenbaum, Steven
PY - 2007/4/10
Y1 - 2007/4/10
N2 - Composite membranes prepared by incorporating Si O2, Ti O2, or Zr (HP O4) 2 particles into Nafion exhibit enhanced performance in proton exchange membrane (PEM) fuel cells tested at elevated temperatures compared to filler-free Nafion when operating under lower relative humidity. Water-transport properties of these membranes were investigated by nuclear magnetic resonance (NMR) methods, including pulsed-field-gradient spin-echo diffusion, spin-lattice relaxation, and spectral measurements. At least two distinct water environments are observed in all materials, and the enhanced water uptake of the composites, relative to filler-free Nafion, is attributed to alteration of the pore structure of the membrane.
AB - Composite membranes prepared by incorporating Si O2, Ti O2, or Zr (HP O4) 2 particles into Nafion exhibit enhanced performance in proton exchange membrane (PEM) fuel cells tested at elevated temperatures compared to filler-free Nafion when operating under lower relative humidity. Water-transport properties of these membranes were investigated by nuclear magnetic resonance (NMR) methods, including pulsed-field-gradient spin-echo diffusion, spin-lattice relaxation, and spectral measurements. At least two distinct water environments are observed in all materials, and the enhanced water uptake of the composites, relative to filler-free Nafion, is attributed to alteration of the pore structure of the membrane.
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U2 - 10.1149/1.2712833
DO - 10.1149/1.2712833
M3 - Article
AN - SCOPUS:34047119613
SN - 0013-4651
VL - 154
JO - Journal of the Electrochemical Society
JF - Journal of the Electrochemical Society
IS - 5
ER -