Abstract
Cerium modified Pt nanoparticles catalysts have been prepared using Ce(III)-ethylenediaminetetraacetic acid (EDTA) chemistry with an impregnation method of 20 % Pt/Carbon Vulcan XC-72. EDTA was used as a chelating agent to form a Ce+3 complex to achieve good dispersion of ceria on Pt/C, as shown by high-resolution transmission electron microscopy. X-ray absorption and X-ray photoelectron spectroscopies showed the presence of Ce+3. Different Ce to Pt atomic ratios have been examined to optimize the catalyst material for methanol oxidation. Half-cell and direct methanol fuel cell studies were done. The electrochemical result demonstrated a higher fuel cell activity for the Ce(III)-EDTA modified 20 % Pt/Carbon Vulcan XC-72 anode material. This was observed in half-cell, with lower onset potentials, and direct methanol fuel cell conditions, with higher power densities while maintaining similar Pt loading.
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Acknowledgments
The authors acknowledge the use of facilities in the Materials Characterization Center of the University of Puerto Rico, especially to Dr. Esteban Rosim Fachini. This work had financial support of NASA-URC Grant No. NNX10AQ17A. The NSF NSEC Center for Hierarchical Manufacturing Grant No. CHM-CMMI–0531171 is gratefully acknowledged. CRC acknowledges the DOE-Brookhaven National Laboratory Visiting Faculty Program. Use of the National Synchrotron Light Source, Brookhaven National Laboratory, was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886.
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Guzmán-Blas, R., Suazo-Dávila, D., Velez, C.A. et al. EDTA-Ce(III) Modified Pt Vulcan XC-72 Catalyst Synthesis for Methanol Oxidation in Acid Solution. Electrocatalysis 5, 50–61 (2014). https://doi.org/10.1007/s12678-013-0152-3
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DOI: https://doi.org/10.1007/s12678-013-0152-3