In one aspect of the present invention, a method of fabricating a composite membrane includes: forming a first polymer solution from a first polymer and a second polymer solution from a second polymer, respectively, where the first polymer includes a charged polymer and the second polymer includes an uncharged polymer; electrospinning, separately and simultaneously, the first and second polymer solutions to form a dual fiber mat with first polymer fibers and second polymer fibers; and processing the dual fiber mat by softening and flowing one of the first or second polymer fibers to fill in the void space between the other of the first and second polymer fibers so as to form the composite membrane. In some embodiments, the composite membrane may be a proton exchange membrane (PEM) or an anion exchange membrane (AEM).
STATEMENT AS TO RIGHTS UNDER FEDERALLY-SPONSORED RESEARCH
This invention was made with government support under grant number DE-FG36-06GO16030 awarded by the Department of Energy, grant number W911NF-11-1-0454 awarded by the U.S. Army, and grant number CBET-1032948 awarded by the National Science Foundation. The government has certain rights in the invention.