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Title

NANOSTRUCTURED BIMETALLIC PT-PD ALLOY ON FUNCTIONALIZED CARBON SUPPORTS AS PEMFC ELECTROCATALYSTS FOR OXYGEN REDUCTION REACTION

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Abstract

 ELECTROCATALYTIC ACTIVITY OF CARBON SUPPORTED PT-PD ALLOY ELECTROCATALYSTS OF DIFFERENT PT PDX ATOMIC RATIOS (X = 0.25, 0.5, 1 AND 2) FORMED BY THE IMPREGNATION SYNTHESIS METHOD, WAS INVESTIGATED WITH REGARD TO THE OXYGEN REDUCTION REACTION (ORR) IN SULFORIC ACID SOLUTION. TO IMPROVE THE UTILIZATION AND ACTIVITY OF CATHODIC CATALYSTS FOR ORR REACTION, THE ALLOY NANOPARTICLES WERE LOADED ON THE MIXTURE OF VULCAN XC-72 AND MWCNT (1:3), WHICH WERE FUNCTIONALIZED IN THE MIXTURE OF 96% SULFURIC ACID AND 4-AMINOBENZENESULFONIC ACID USING SODIUM NITRITE TO PRODUCE INTERMEDIATE DIAZONIUM SALTS FROM SUBSTITUTED ANILINES. THE PERFORMANCE OF THE ELECTRODES FOR THE ORR WAS MEASURED USING ELECTROCHEMICAL TECHNIQUES, INDUCTIVE COUPLED PLASMA (ICP), X-RAY DIFFRACTION (XRD) AND TRANSMISSION ELECTRON MICROSCOPE (TEM). FOR THE SYNTHESIZED PT PDX/C ELECTROCATALYSTS, THE HIGHEST CATALYTIC ACTIVITY FOR THE ORR, WAS FOUND FOR A PT: PD ATOMIC RATIO OF 2:1 IN ACIDIC MEDIA. SINCE THE SULFONATION OF CARBON-SUPPORTED CATALYSTS AS MIXED ELECTRONIC AND PROTONIC CONDUCTORS IS AN EFFICIENT WAY TO INCREASE THE TRIPLE-PHASE BOUNDARIES, THE MODIFIED ELECTRO CATALYSTS SHOWED BETTER PERFORMANCE COMPARED TO UNSULFONATED ONE.

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