This graphene-based proton exchange membrane improves direct methanol fuel cells' performance. Because methanol has a high energy density and is easy to store, direct methanol fuel cells (DMFCs) could become viable energy sources for portable applications, enabling users to charge notebook computers, mobile phones, vehicles and military or medical equipment when wall plugs are inaccessible. The proton exchange membranes (PEMs) now found in DMFCs experience excessive swelling at high fuel concentrations and allow for undesirable fuel crossover. By using graphene as a starting material, University of Florida researchers created a PEM layer that is highly selective to proton transport. PEMs made from graphene survive concentrated methanol solutions without swelling. Sufficiently large platelets suppress methanol crossover, improving PEM stability and resulting in direct methanol fuel cells with higher power density and higher energy output. This new proton exchange membrane will simplify DMFCs fabrication, removing a barrier to widespread adoption. The market for DMFCs is expected to grow 45 percent a year until 2016, when annual revenue will reach approximately $109 million.
ApplicationGraphene-based proton exchange membrane that creates more efficient direct methanol fuel cells for better-performing electronic devices
- Allows for the creation of DMFCs with improved energy output and power density, providing a competitive advantage over available direct methanol fuel cells
- Prevents swelling at higher temperatures, improving performance and durability
- Functions better in highly concentrated methanol solutions than existing PEMs, enhancing reliability
- Represents an essential advancement in PEMs, removing a barrier to widespread commercialization of DMFCs