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Fabrication and performance evaluation of a novel membrane electrode assembly for DMFCs

Noroozifar, Meissam, Yavari, Zahra, Khorasani-Motlagh, Mozhgan, Ghasemi, Tahere, Rohani-Yazdi, Seyed-Hamzeh, Mohammadi, Majid
RSC advances 2015 v.6 no.1 pp. 563-574
catalysts, catalytic activity, chitosan, coprecipitation, electrochemistry, fuel cells, glassy carbon electrode, graphene, methanol, nanocomposites, nanoparticles, oxidation, palladium, poly(vinyl chloride)
In the current study, a nano-scale perovskite LaNi₀.₅Fe₀.₅O₃ (LaNi₀.₅Fe₀.₅O₃NPs) was synthesized by a rapid ultrasonic-assisted co-precipitation method and characterized by various techniques. A modified glassy carbon electrode with Pd nanoparticles (PdNPs) and LaNi₀.₅Fe₀.₅O₃NPs dispersed into chitosan (CH) polymer was prepared and its catalytic activity toward methanol oxidation was investigated. Based on the electrochemical studies, the PdNPs-LaNi₀.₅Fe₀.₅O₃NPs-CH nanocomposite showed considerable activity for methanol oxidation in comparison to PdNPs-CH. Then a gas diffusion layer (GDL) was prepared with the ratio of 40% wt graphene carbon and 60% wt polymer mixture (consisting of 35% wt polyvinyl chloride and 65% wt polyaniline) for the micro-porous layer and a teflonated carbon cloth as the macro-porous substrate. A direct methanol fuel cell was designed, assembled and tested with the suggested PdNPs-LaNi₀.₅Fe₀.₅O₃NPs-CH nanocomposite as anodic catalyst and the synthetic GDL under several different conditions.