Abstract
Highly proton conductive and mechanically stable Nafion ®112 based composite membranes with suppressed methanol permeability were prepared via Layer-by-Layer (LbL) technique for fuel cell applications. It was observed from UV–vis results that the polyelectrolyte layers growth on Nafion membrane surface regularly. (PAH/PSS) 20–H + with 0.01 M NaCl exhibited 39.9% reduction in methanol permittivity and nearly 2 times higher proton conductivity (0.152 S cm −1) than that of untreated Nafion ®112. Promisingly, it was found that the membrane selectivity ( Φ) values of all multilayered composite membranes in proton form prepared from polyelectrolytes comprising NaCl were higher than that of both untreated and chemically treated Nafion ®112. Furthermore, the mechanical and thermal properties of the composite membrane obtained from polyelectrolytes free salt were enhanced due to the interaction between the polar phase of Nafion and anionic/cationic charges of polyions.
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