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      Carbon supported nano-sized Pt-Pd and Pt-Co electrocatalysts for proton exchange membrane fuel cells

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      Author(s)
      Kadirgan, F.
      Kannan, A. M.
      Atilan, T.
      Beyhan, S.
      Ozenler, S. S.
      Süzer, Şefik
      Yörür, A.
      Date
      2009
      Source Title
      International Journal of Hydrogen Energy
      Print ISSN
      0360-3199
      Electronic ISSN
      1879-3487
      Volume
      34
      Issue
      23
      Pages
      9450 - 9460
      Language
      English
      Type
      Article
      Item Usage Stats
      153
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      192
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      Abstract
      Nano-sized Pt-Pd/C and Pt-Co/C electrocatalysts have been synthesized and characterized by an alcohol-reduction process using ethylene glycol as the solvent and Vulcan XC-72R as the supporting material. While the Pt-Pd/C electrodes were compared with Pt/C (20 wt.% E-TEK) in terms of electrocatalytic activity towards oxidation of H2, CO and H2-CO mixtures, the Pt-Co/C electrodes were evaluated towards oxygen reduction reaction (ORR) and compared with Pt/C (20 wt.% E-TEK) and Pt-Co/C (20 wt.% E-TEK) and Pt/C (46 wt.% TKK) in a single cell. In addition, the Pt-Pd/C and Pt-Co/C electrocatalyst samples were characterized by XRD, XPS, TEM and electroanalytical methods. The TEM images of the carbon supported platinum alloy electrocatalysts show homogenous catalyst distribution with a particle size of about 3-4 nm. It was found that while the Pt-Pd/C electrocatalyst has superior CO tolerance compared to commercial catalyst, Pt-Co/C synthesized by polyol method has shown better activity and stability up to 60 °C compared to commercial catalysts. Single cell tests using the alloy catalysts coated on Nafion-212 membranes with H2 and O2 gases showed that the fuel cell performance in the activation and the ohmic regions are almost similar comparing conventional electrodes to Pt-Pd anode electrodes. However, conventional electrodes give a better performance in the ohmic region comparing to Pt-Co cathode. It is worth mentioning that these catalysts are less expensive compared to the commercial catalysts if only the platinum contents were considered.
      Keywords
      Pt-Co/C
      Pt-Pd/C
      Alcohol-reduction process
      Alloy catalyst
      Anode electrodes
      Carbon supported platinum
      CO tolerance
      Commercial catalyst
      Electroanalytical method
      Electrocatalytic activity
      Fuel cell performance
      Homogenous catalyst
      Membrane electrode assemblies
      Nano-sized
      Ohmic region
      Oxidation of H
      Oxygen reduction reaction
      PEM fuel cell
      Polyol methods
      Single cells
      Supporting material
      TEM
      TEM images
      Vulcan XC72
      XPS
      XRD
      Catalyst activity
      Economic analysis
      Electrocatalysts
      Electrodes
      Electrolysis
      Electrolytic reduction
      Ethylene
      Ethylene glycol
      Organic solvents
      Oxygen
      Palladium
      Platinum
      Proton exchange membrane fuel cells (PEMFC)
      Platinum alloys
      Permalink
      http://hdl.handle.net/11693/22549
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.ijhydene.2009.09.028
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