Abstract
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 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 E 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 (on 32.8 mA/cm2) for an extended period of time (30 min) with least indication of CO poisoning effects.
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Acknowledgments
The research team acknowledges the financial support provided by King Abdul Aziz City for Science and Technology (KACST) to this research under KACST-TIC for CCS project no 03. The team also acknowledges the facilities and support provided by KFUPM.
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Rehman, A., Hossain, S.S., ur Rahman, S. et al. Influence of CeO2 on Pt-Pd/CeO2-OMC Catalysts for Formic Acid Oxidation. Electrocatalysis 6, 348–356 (2015). https://doi.org/10.1007/s12678-015-0250-5
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DOI: https://doi.org/10.1007/s12678-015-0250-5