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Synthesis, characterization and performance determination of an Ag@Pt/C electrocatalyst for the ORR in a PEM fuel cell

Esfandiari, A ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1016/j.ijhydene.2016.09.097
  3. Publisher: Elsevier Ltd , 2016
  4. Abstract:
  5. Ag@Pt nanoparticles synthesized with different Ag/Pt mass ratios utilizing ultrasonic treatment method. These materials were supported on Vulcan XC-72 and utilized as cathode in a proton exchange membrane fuel cell (PEMFC). The morphology of this material characterized through the x-ray diffraction (XRD), induced coupled plasma atomic emission spectroscopy (ICP-OES) as well as; high resolution transmission electron microscopy (HRTEM) techniques. To begin with, it was proven that, the prepared Ag@Pt/C catalyst possessed a core–shell nanostructure. The electrochemical properties of this material investigated through the Cyclic Voltammetry (CV), linear sweep voltammetry (LSV) and Electrochemical Impedance Spectroscopy (EIS) in acidic media. Moreover; it was shown that, the Ag@Pt/C with Ag/Pt ratio of 1:3 possessed the largest electrochemical surface area (ESCA) of 67.8 m2 g−1 and its oxygen reduction activity proceeded through a 4e− reaction pathway. Furthermore; it was demonstrated that, the determined stability of the (1:3) Ag@Pt/C was significantly higher compared with those of other elctrocatalysts prepared at different Ag/Pt ratios in particular; to the one without the Ag element (i.e.; a commercial Pt/C one). Ultimately, the electrocatalytic behavior of the (1:3) Ag@Pt/C) investigated through a unit cell structure of a PEMFC and compared with that of a virgin commercial Pt/C cathode. It was observed that, the maximum power density of the MEA utilizing the (1:3) Ag@Pt/C electrocatalyst was 30% higher than that of the Pt/C
  6. Keywords:
  7. Electrocatalyst ; MEA ; PEMFC ; Atomic emission spectroscopy ; Cathodes ; Characterization ; Cyclic voltammetry ; Electrocatalysts ; Electrochemical impedance spectroscopy ; Electrodes ; Electrolytic reduction ; Emission spectroscopy ; Fuel cells ; High resolution transmission electron microscopy ; Platinum ; Platinum alloys ; Proton exchange membrane fuel cells (PEMFC) ; Reduction ; Synthesis (chemical) ; X ray diffraction ; Core shell ; Electrocatalytic behavior ; Electrochemical surface area ; Induced coupled plasmas ; Linear sweep voltammetry ; Oxygen Reduction ; Pt/C electrocatalysts ; Ultrasonic treatments ; Silver
  8. Source: International Journal of Hydrogen Energy ; Volume 41, Issue 45 , 2016 , Pages 20720-20730 ; 03603199 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0360319916327987