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Title

PT- SNO2 ELECTROCATALYST FOR ETHANOL OXIDATION IN ACID ENVIRONMENT

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Abstract

 AN INTERESTING ALTERNATIVE TO H2-FUELED PEMFC FOR PORTABLE AND MOBILE APPLICATION IS THE USE OF ETHANOL AS A FUEL (DEFC) [1]. MANY STUDIES HAVE POINTED PT-SN/C AS THE BEST ELECTROCATALYST FOR ETHANOL ELECTRO-OXIDATION (EOR) IN ACID ENVIRONMENT. HOWEVER, THESE KINDS OF ALLOYS USUALLY SHOW RELATIVELY LOW SELECTIVITY FOR CO2 FORMATION COMPARED WITH PT ALONE [2]. ZHU ET AL. [3] SYNTHESIZED PT-SNO2 AND PTSN ALLOY CATALYST. THE ANALYSIS OF THE PRODUCTS SHOWS THAT ADDITION OF SNO2 ENHANCED THE TOTAL OXIDATION TO CO2.IN THIS WORK, WE SYNTHESIZED SNO2 BY AN EX SITU METHOD AND MADE A BINARY CATALYST BY ADDING A TIN OXIDE TO PT AND ITS PERFORMANCE COMPARED WITH PT-SN. PT-SNO2 AND PT-SN CATALYSTS SUPPORTED ON CARBON WERE SYNTHESIZED BY A MODIFIED POLYOL METHOD. THE XRD ANALYSIS SHOWED THE ALLOY CATALYST WAS SYNTHESIZED. ELECTROCHEMICAL TESTS SUCH AS CV,LSV, CHORNOAMPEROMETRY AND EIS WERE PERFORMED FOR TWO CATALYSTS. THE CV RESULTS INDICATE THAT THE ONSET POTENTIAL OF TWO CATALYSTS WAS SAME BUT THE RATIO OF IF/IB (CO2 TOLERANCE) FOR PT-SNO2 WAS GREATER THAN PT-SN. THE EIS TECHNIQUE WAS USED TO INVESTIGATE THE CATALYTIC ACTIVITY FOR THE CO OXIDATION AND PT-SNO2 HAVE A BETER TOLERANCE TO CO2.

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