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Microwave-Assisted Synthesis of Pt-Au Nanoparticles with Enhanced Electrocatalytic Activity for the Oxidation of Formic AcidGema Cabello,*,1 Rogério A. Davoglio,*,1 Fabian W. Hartl,2 Jose F. Marco,3 Ernesto C. Pereira,1 Sonia R. Biaggio,1 Hamilton Varela2, Angel Cuesta4
1 Departamento de Química, Universidade Federal de São Carlos, 13565-905, São Carlos, SP, Brazil2 Institute of Chemistry of Sao Carlos, University of Sao Paulo, POB 780, BR-13560970 Sao Carlos, SP, Brazil3 Instituto de Química-Física “Rocasolano”-CSIC, c/ Serrano, 119, 28006, Madrid, Spain4 Department of Chemistry, School of Natural and Computing Sciences, University of Aberdeen, Aberdeen AB24 3UE, UK
*Corresponding authors: (GC) [email protected]; (RAD) [email protected]
(These authors contributed equally to this work).
Figure S1. XRD patterns of Pt and Pt-Au catalysts with different Pt:Au composition: 3/1, 1/1, 1/3 and 1/9. The yellow and blue vertical dashed lines correspond to the crystallographic diffraction of standard Au (JCPD-4784) and Pt (JCPD-4802), respectively.
Figure S2. Au 4f and Pt 4f XP spectra of the materials prepared (fitted).
Figure S3. Cyclic voltammograms of Pt and Pt-Au NPs, recorded in 0.05 M HCOOH and 0.5 M H2SO4 at 50 mV s-1. Currents normalized to the Pt mass.
Figure S4. dE/dt vs. E graphs for Pt, Pt3Au and PtAu nanoparticles, obtained from the galvanostatic chronopotentiometric series in Figure 4.
Figure S5. Chronopotentiometric measurements in 0.5 M H2SO4 + 0.05 M HCOOH at the current of the voltammetric maximum for each electrode (□) Pt; (○) Pt3Au; (∆) PtAu; (⌂) PtAu3; (▼) PtAu9.