Fabrication and Evaluation of Pt/M (M= Co, Fe) Chitosan Supported Catalysts for Methanol Electrooxidation: Application in Direct Alcohol Fuel Cell

در اين مقاله نانوذراتPt، Coو Fe با روش ساده ي كاهش شيميايي نمك هاي فلزي در كيتوسان به عنوان ساپورت سنتز شدند. . NaBH4 به عنوان كاهنده براي سنتز نانوكامپوزيت هاي Pt-Fe، Pt-Co و-chitosan Pt-Fe-Co سنتز و ا ميكروسكوپ الكتروني عبوري و اسپكتروسكوپي Uv-vis شناسايي شدند. در ادامه الكترودهاي GC/Pt-chitosan, GC/Pt-Co-chitosan, GC/Pt-Fe-chitosan و GC/Pt-Co-Fe-chitosan ساخته شدند و كارايي اين الكترودها در الكترواكسيداسيون متانول بررسي شد. نتايج نشان داد كه نانوكاتاليست Pt-Fe-Co-chitosan بهترين گزينه براي الكترواكسيداسيون متانول مي باشد. واژگان كليدي: كيتوسان، پيل سوختي مستقيم، پسيل سوختي، الكترواكسيداسيون متانول، نانوذرات

In this work, Pt, Fe and Co nanoparticles were prepared by chemical reduction of the metal salts in chitosan as the support. NaBH4 was used as the reducing agent Pt-Fe, Pt-Co and Pt-Fe-Co-chitosan nanocomposites were synthesized and characterized by UV–Vis spectra and Transmission electron microscopy images. GC/Pt-chitosan, GC/Pt-Co-chitosan, GC/ Pt-Fe-chitosan and GC/Pt-Co-Fe-chitosan electrodes were prepared. Te performances of these electrodes for methanol electrooxidation were investigated through cyclic voltammetric and chronoamperometric curves. Te efect of some experimental factors such as the amounts of Fe and Co nanoparticles dispersed in chitosan, methanol concentration and scan rate were studied and the optimum conditions were determined. Te efect of temperature was also investigated and the activation energies were calculated. Te performance of Pt-Fe-Co-chitosan nanocomposites was determined in a direct methanol fuel cell in diferent conditions. Te electrochemical and fuel cell measurements showed that Pt-Fe-Co- chitosan nanocatalyst has the best activity for electrooxidation of methanol among all diferent compositions electrodes.