Portable PEMFC stack using sulfonated poly (fluorenyl ether ketone) ionomer as membrane

Portable polymer electrolyte membrane fuel cells (PEMFCs) stack was assembled with sulfonated poly(fluorenyl ether ketone) (SPFEK) ionomer membranes. The portable PEMFC stack was studied by means of cell performance tests at high temperatures under low relatively humidity (RH). The experimental results showed that the output power of the stack increased from 28.74 W to 37.11 W with increasing operating temperature from 30 to 90 °C under 100% RH. When the operating temperature was over 100 °C, the output power decreased with further increasing temperature from 27.68 W (100 °C, 85% RH) to 19.87 W (120 °C, 50% RH). The output at 120 °C and under 50% RH was 69% output power of the stack at 30 °C and under 100% RH. These results demonstrated that the self-prepared SPFEK ionomer membrane was a promising PEM for the application in high-temperature PEMFC.