چکیده انگلیسی:
In the present study, PtRuCe/MWNTs nanocatalysts synthesized via polyol process technique are appliedas anode electro-catalyst in methanol electro-oxidation reaction (MOR). To characterize the nanocatalysts,TEM, XRD, EDS and XPS are investigated. Cyclic voltammetry and choronoamperometry are used to evaluatethe electro-catalytic activity and stability of the catalysts in methanol electro-oxidation, respectively. Furtheraddition of the Ce promoter to MWNTs-supported PtRu nanocatalyst shows the highest activity and the lowestonset potential in MOR at Ce to Pt molar ratio of 0.7. A significant enhancement of the forward anodic peak incyclic voltammetry experiments is observed for the Ce-promoted PtRu catalyst with cerium to platinum molarratio of 0.7, i.e. 349 mA/cm2.mgPt , in comparison with 182 mA/cm2.mgPt and 251 mA/cm2.mgPt , respectively,corresponding to Pt/MWNTs and PtRu(1:1)/MWNTs nanocatalysts. Furthermore, the chronoamperommetryresults present a remarkable improvement in the final current density of PtRuCe/MWNTs (6.1 mA/cm2),compared to the un-promoted catalysts, having a decreasing propensity, i.e. PtRu/MWNTs (3.7 mA/cm2) andPt/MWNTs (2.05 mA/cm2.mgcat). The improved performance of PtRuCe/MWNTs may be attributed to theformation of highly-dispersed Pt nanoparticles on the support, followed by a significant enhancement of bifunctionalmechanism, as a result of cerium incorporation.
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