Effect of Se modification on RuSey/C electrocatalyst for oxygen reduction with phosphoric acid

Hee Young Park, Sung Jong Yoo, Soo Jin Kim, Sang Young Lee, Hyung Chul Ham, Yung Eun Sung, Soo Kil Kim, Seung Jun Hwang, Hyoung Juhn Kim, Eunae Cho, Dirk Henkensmeier, SukWoo Nam, Tae Hoon Lim, Jong Hyun Jang

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Abstract

Carbon-supported Se-modified-Ru catalysts (RuSey/C) were synthesized, and their phosphate adsorption characteristics were evaluated using electrochemical techniques and in-situ X-ray absorption spectroscopy (XAS). When phosphoric acid was added, the ORR activity of unmodified Ru/C decreased by 26.8% because the active sites were blocked by electrochemical adsorption, as confirmed by CV. However, for RuSey/C, the ORR activity was enhanced with phosphoric acid (RuSe1.56/C: 63.8%), which indicates that the kinetics at each site increased to compensate for the site blocking effect. The XAS results demonstrated that, for RuSey/C, phosphoric acid molecules or phosphate anions primarily interacted with Se atoms, and the oxidation state of Ru atoms decreased. Therefore, it was concluded that the enhanced ORR kinetics originated from the decreased oxygen binding energy with larger electrostatic repulsion.

Original languageEnglish
Pages (from-to)46-49
Number of pages4
JournalElectrochemistry Communications
Volume27
DOIs
Publication statusPublished - 2013 Feb 1
Externally publishedYes

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Keywords

  • High temperature-PEMFC
  • Oxygen reduction reaction
  • Phosphoric acid
  • Se-modified-Ru catalyst

ASJC Scopus subject areas

  • Electrochemistry

Cite this

Park, H. Y., Yoo, S. J., Kim, S. J., Lee, S. Y., Ham, H. C., Sung, Y. E., Kim, S. K., Hwang, S. J., Kim, H. J., Cho, E., Henkensmeier, D., Nam, S., Lim, T. H., & Jang, J. H. (2013). Effect of Se modification on RuSey/C electrocatalyst for oxygen reduction with phosphoric acid. Electrochemistry Communications, 27, 46-49. https://doi.org/10.1016/j.elecom.2012.10.032