Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Fine Structure Effect of PdCo electrocatalyst for Oxygen Reduction Reaction Activity: Based on X-ray Absorption Spectroscopy Studies with Synchrotron Beam

  • Kim, Dae-Suk (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Tae-Jun (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Jun-Hyuk (School of Mechanical Engineering, Pusan National University) ;
  • Zeid, E. F. Abo (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Yong-Tae (School of Mechanical Engineering, Pusan National University)
  • Received : 2010.08.30
  • Accepted : 2010.09.08
  • Published : 2010.09.30
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Abstract

In this study, we have demonstrated the fine structure effect of PdCo electrocatalyst on oxygen reduction reaction activity with different alloy composition and heat-treatment time. In order to identify the intrinsic factors for the electrocatalytic activity, various X-ray analyses were used, including inductively coupled plasma-atomic emission spectrometer, transmission electron microscopy, X-ray diffractometer, and X-ray Absorption Spectroscopy technique. In particular, extended X-ray absorption fine structure was employed to extract the structural parameters required for understanding the atomic distribution and alloying extent, and to identify the corresponding simulated structures by using FEFF8 code and IFEFFIT software. The electrocatalytic activity of PdCo alloy nanoparticles for the oxygen reduction reaction was evaluated by using rotating disk electrode technique and correlated to the change in structural parameters. We have found that Pd-rich surface was formed on the Co core with increasing heating time over 5 hours. Such core shell structure of PdCo/C showed that a superior oxygen reduction reaction activity than pure Pd/C or alloy phase of PdCo/C electrocatalysts, because the adsorption energy of adsorbates was apparently reduced by lowering the dband center of the Pd skin due to a combination of the compressive strain effect and ligand effect.

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References

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