Abstract
AbstractThe degradation mechanisms and phenomena of membrane electrode assembly (MEA) for proton exchange membrane fuel cell (PEMFC under low humidity operation were investigated by means of several on‐line electrochemical methods and transmission electron microscopy (TEM). Electrochemical active surface area (ECSA) of catalyst and hydrogen crossover of MEA were evaluated by cyclic voltagram (CV) and linear sweep voltagram (LSV), respectively. The decrease of catalytic active site and degradation of membrane were evident by ECSA loss and hydrogen crossover rate increase after long‐term discharging test. Membrane degradation played the major role for MEAs failure under low humidity operation in this study. The Pt clusters were also observed in the membrane, formed by Pt ions migration and reduction in the membrane, which can react with the crossover gases to produce free radicals that attack membrane and ionomers in the catalyst layer.Those phenomena will drive membrane to rupture and cause a short circuit in MEA. By AST experiments and fluoride release rate results, the MEA with Pt‐alloy/C catalyst can show better performance and durability due to its high selectivity on ORR to depress the free radicals formation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
