Effects of stabilizers on the synthesis of Pt3Cox/C electrocatalysts for oxygen reduction

Joung Woon Kim, Ji Hyun Heo, Seung Jun Hwang, Sung Jong Yoo, Jong Hyun Jang, Jeong Sook Ha, Soohwan Jang, Tae Hoon Lim, SukWoo Nam, Soo Kil Kim

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Pt3Cox/C electrocatalysts for use as cathodes in proton exchange membrane fuel cells are fabricated using various stabilizers to control the different reduction speeds between Pt and Co ions. Four different types of stabilizers - sodium acetate, oleylamine, tetraoctylammonium bromide (TOAB), and hexadecyltrimethylammonium bromide (CTAB) - differing in molecular structures and ionic states are tested. Primarily, Pt3Co x/C alloy nanoparticles are synthesized with 0.6 < x < 0.8 after heat treatment to remove the residual stabilizers. A significant improvement in the activity for oxygen reduction reaction is observed in the case of TOAB- and CTAB-mediated Pt3Cox/C catalysts. In particular, CTAB-mediated catalysts exhibit the best activity, which is about 2-times higher mass activity than commercial Pt/C catalyst. The higher mass activity is believed to result from not only the alloying effects with small atomic size Co but also better dispersion and smaller particle size after heat treatment at relatively low temperature.

Original languageEnglish
Pages (from-to)12088-12095
Number of pages8
JournalInternational Journal of Hydrogen Energy
Volume36
Issue number19
DOIs
Publication statusPublished - 2011 Sep 1

    Fingerprint

Keywords

  • Oxygen reduction reaction
  • PEMFC
  • PtCo/C catalyst
  • Stabilizer

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this