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Title

GRAPHENE NANO SHEETS SUPPORTED PALLADIUM NANOPARTICLES AS ELECTRO CATALYST FOR OXYGEN REDUCTION REACTION

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Abstract

 FUTURE ENERGY CONCERNS DEMAND A TRANSITION FROM FOSSIL FUELS TO NEW ENERGY SOURCES THAT ARE MORE ENVIRONMENTALLY BENIGN AND RENEWABLE. A PROMISING ROUTE FOR ACCOMPLISHING THIS GOAL IS TO USE FUEL CELLS TO CONVERT THE CHEMICAL ENERGY OF FUEL DIRECTLY INTO ELECTRICITY. THE FUEL CELLS HAVE BEEN RECOGNIZED AS A FEASIBLE POWER SOURCE DUE TO ITS LOW EMISSIONS OF POLLUTANTS, HIGH POWER DENSITY, AND HIGH ENERGY CONVERSION EFFICIENCY. HOWEVER, THE COMMERCIAL APPLICATION OF FUEL CELLS IS STILL IMPACTED BY SEVERAL PROBLEMS, INCLUDING POOR KINETICS OF BOTH THE ANODIC AND CATHODIC REACTIONS [1].ELECTRO CATALYSIS OF OXYGEN REDUCTION REACTION (ORR) IS A HIGHLY INTERESTING RESEARCH AREA DUE TO ITS GREAT IMPORTANCE IN FUEL CELLS AND SENSORS. THUS, MANY DIFFERENT MATERIALS HAVE BEEN PROPOSED AS ELECTRO CATALYSTS, AND THE MECHANISM OF THE ELECTROCHEMICAL REDUCTION OF MOLECULAR OXYGEN AT VARIETIES OF ELECTRODE MATERIALS HAS BEEN EXTENSIVELY STUDIED. OF ALL THE MATERIALS DESCRIBED IN THE LITERATURE, THE NOBLE METALS ARE CONSIDERED THE BEST ELECTRO CATALYSTS FOR OXYGEN REDUCTION [2].IN RECENT YEARS, THE CARBON-BASED NANO MATERIALS HAVE ATTRACTED MUCH INTEREST. GRAPHENE IS A NEW 2D NANOMATERIAL WITH OUTSTANDING MATERIAL, PHYSICAL, CHEMICAL, AND ELECTROCHEMICAL PROPERTIES. GRAPHENE IS COMMONLY USED AS SUPPORT FOR NOBLE METALS DUE TO SEVERAL ADVANTAGES, E.G. HIGH CONDUCTIVITY, VERY LARGE SURFACE AREA, GOOD CHEMICAL STABILITY AND EASY RECOVERY OF NOBLE METALS FROM SPENT CATALYSTS [3].IN THIS PAPER, THE ELECTRO CATALYTIC REACTIVITY OF PALLADIUM-MODIFIED GRAPHENE NANO SHEETS (PD-GNS) FOR THE OXYGEN REDUCTION REACTION WAS INVESTIGATED ON THE GLASSY CARBON ELECTRODE (GCE) SURFACE. THE OXYGEN REDUCTION AT THE PD-GNS ELECTRODE STARTED AT A MORE POSITIVE POTENTIAL THAN THAT AT THE BARE GCE. THE RESULTS DEMONSTRATE THAT THIS MODIFIED ELECTRODE HAS REMARKABLE ELECTRO CATALYTIC ACTIVITY AND HIGH STABILITY TOWARD ORR IN ACID MEDIUM.

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