Experiment study on sodium chloride diffusion in membrane electrode of proton exchange membrane fuel cell

Abstract

The sodium chloride poisoning of proton exchange membrane fuel cell (PEMFC) has important influence on performance. The concentration diffusion of NaCl on a PEM fuel cell membrane electrode (MEA) was investigated. The MEA was soaked in five NaCl solutions with different concentrations (0mg/L, 50mg/L, 100 mg/L, 300 mg/L, 500 mg/L), and the surface morphology was observed by scanning electron microscope, and the element content was quantitatively analyzed by energy dispersive spectrometer. The results show that with the increase of pollution concentration, the number and size of sodium chloride square crystal on the gas diffusion layer also show a positive correlation.; At the same time, the analysis of the determination results of the energy dispersive spectrometer shows that the closer to the proton exchange membrane region of the membrane electrode, the percentage of sodium atom content also presents a positive correlation.