Effect of support on activity and stability of Pt–Pd catalyst for oxygen reduction reaction in proton exchange membranefuel cells

Nowadays, the physical and chemical synthesis of Pt and Pd based nanocatalysts is of interest because they are very highly active electrocatalysts towards oxygen reduction reactions (ORR).The enhancement of the activity for Pt in the presence of Pd originates from the weakening ofthe O-O bond on Pd-modified Pt nanoparticles. On the other hand, the enhancements of the carbon support properties have been also pursued and are considered to be crucial. Sulfonation of carbon materials and its use as a support for catalysts as mixed electronic and protonic conductors has been demonstrated to be an efficient way to improve the structure of the triplephase boundaries. In the present work, the Pt-Pd nanoparticles were loaded on the mixture of Vulcan XC-72 and MWCNT (1:3), which were functionalized in the mixture of 96% sulfuricacid and 4-aminobenzenesulfonic acid using sodium nitrite to produce intermediate diazonium salts from substituted anilines. The electrocatalytic activity of Pt2Pd/C was investigated withregard to the oxygen reduction reaction (ORR). The maximum power density of MEA The maximum power density of MEA with Pt2Pd /C catalyst is about 564 mWcm−2.

کلیدواژه ها:

Polymer electrolyte fuel cell ، Phenyl sulfonic acid ، Pt-Pd nanoparticles ، Electrocatalysis ، Membrane Electrode Assembly (MEA)