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Comprehensive Study of an Ag@Pt Core–shell Nanoparticles Supported on Carbon Structure in a Proton Exchange Membrane Fuel Cell

Esfandiari, Ali | 2017

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 49298 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kazemeini, Mohammad; Bastani, Dariush
  7. Abstract:
  8. Core-shell structures of Ag@Pt nanoparticles (NPs) dispersed on Carbon Vulcan XC-72, Multiwalled carbon nanotube and reduced graphene oxide (rGO) support containing different Ag:Pt mass ratios and applied to the oxygen reduction reaction (ORR) in a proton exchange membrane fuel cell (PEMFC) were synthesized by the ultrasonic and reduction treatment method. The morphology of as-prepared catalysts characterized by the high resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD) and induced coupled plasma atomic emission spectroscopy (ICP-OES). The ORR activities and stabilities of catalysts were studied through electrochemical measurements utilizing the Cyclic Voltammetry (CV) and single cell tests; respectively. The results revealed, the prepared Ag@Pt supported on different carbon structure catalyst possessed a core-shell nanostructure. The Ag@Pt/rGO with the Ag:Pt mass ratio of 1:3 displayed the largest electrochemical surface area (77.6m2/g) as well as; provided highest stability compared with prepared electrodes (containing other Ag:Pt ratios and Vulcan and MWCNT support) and the obtained commercial Pt/C material. The charge transfer resistances value of the (1:3) Ag@Pt/rGO electrocatalyst was 61 and was found to be the lowest in comparison with other electrodes synthesized in this work. The maximum power density for the MEA prepared with the Ag:Pt mass ratio of 1:3 on Carbon Vulcan Xc-72, MWCNT and graphene oxide was determined to be 30%, 50% and 55% respectively, higher than that of the commercial Pt/C evaluated through the single cell techniques. Thus, the Ag@Pt nanostructure supported upon carbon base seemed to be a very promising cathode material to be used in PEM fuel cells.c
  9. Keywords:
  10. Electrocatalysts ; Oxygen Reduction Reaction ; Reduced Graphene Oxide ; Core-Shell Structure ; Proton Exchange Membrane (PEM)Fuel Cell ; Multi-Walled Carbon Nanotube ; Vulcan Carbon

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