399760 Enhanced Modification Effect of CeO2 on Pt-Pd Binary Catalysts for Formic Acid Oxidation

Monday, April 27, 2015
Exhibit Hall 5 (Austin Convention Center)
Azeem Ur Rehman, Environmental, University of Engineering & Technology Lahore, Pakistan, Lahore, Pakistan

This article deals with the promotional effects of CeO2 on PtPd/CeO2-OMC electrocatalysts. The synthesized catalysts are characterized using different physicochemical techniques and evaluated in a formic acid oxidation fuel cell.  N2 adsorption/desorption analysis shows that CeO2 modification increases the surface area of OMC from 1005 m2/g to 1119 m2/g.  SEM, XRD and TEM analysis reveal that the presence of CeO2 enhances the active metal(s) dispersion on the CeO2-OMC surface.  The average particle size of the dispersed metal decreases with the increase of Pt/Pd ratio on CeO2-OMC support.  Cyclic voltametry measurement of Pd/CeO2-OMC gives 12 % higher anodic current activity with 83 mV negative shift of the peak potential as compared to unmodified Pd/OMC. In bimetallic catalysts, the addition of Pt improves the activity and stability of the catalysts significantly.  Among the bimetallic samples, Pd3Pt1/CeO2-OMC displays superior current density (74.6 mA/cm2), which is 28.3 times higher than that of Pt/CeO2-OMC.  It also shows higher stability in extended period of runs with least indication of CO poisoning effects.

Extended Abstract: File Not Uploaded