Interface-designed Membranes with Shape-controlled Patterns for High-performance Polymer Electrolyte Membrane Fuel Cells.

ABSTRACT: Polymer electrolyte membrane fuel cell is a promising zero-emission power generator for stationary/automotive applications. However, key issues, such as performance and costs, are still remained for an economical commercialization. Here, we fabricated a high-performance membrane electrode assembly (MEA) using an interfacial design based on well-arrayed micro-patterned membranes including circles, squares and hexagons with different sizes, which are produced by a facile elastomeric mold method. The best MEA performance is achieved using patterned Nafion membrane with a circle 2??m in size, which exhibited a very high power density of 1906?mW/cm(2) at 75?°C and Pt loading of 0.4?mg/cm(2) with 73% improvement compared to the commercial membrane. The improved performance are attributed to the decreased MEA resistances and increased surface area for higher Pt utilization of over 80%. From these enhanced properties, it is possible to operate at lower Pt loading of 0.2?mg/cm(2) with an outstanding performance of 1555?mW/cm(2) and even at air/low humidity operations.

SUBMITTER: Jeon Y 

PROVIDER: S-EPMC4639844 | biostudies-other | 2015

REPOSITORIES: biostudies-other