Non-platinum oxygen reduction electrocatalysts based on carbon-supported metal-polythiophene composites

Su Jung Han, Hyun Jung Jung, Jun Ho Shim, Hyun Chul Kim, Shi Joon Sung, Bong Yoo, Dong Ha Lee, Chongmok Lee, Youngmi Lee

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A series of carbon-supported metal-polythiophene composite (M-PTh/C) electrocatalysts are synthesized based on seven different non-Pt metals (M = Ir, Ru, Pd, Co, Fe, Ni, Sn) using chemical polymerization method. The electrocatalytic activity toward the oxygen reduction reaction (ORR) is characterized in acidic condition using rotating disk electrode voltammetry. Ir-, Ru-, and Pd-PTh/C show far more positive (ca. 700 mV) ORR onset potentials than Co-, Fe-, Ni-, and Sn-PTh/C. Further studies on the ORR kinetics are carried out for the three superior catalysts, Ir-, Ru-, Pd-PTh/C, using Koutecky-Levich and Tafel plots. The number of electrons (n) transferred in the ORR is ∼4 for these three catalysts, suggesting 4-electron transfer ORR is dominant. Considering all the obtained factors (such as the onset potential, n value, and exchange current density), Ir- and Ru-PTh/C catalysts are concluded to have relatively excellent ORR catalytic activity.

Original languageEnglish
Pages (from-to)39-44
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume655
Issue number1
DOIs
StatePublished - 15 May 2011

Bibliographical note

Funding Information:
This research was carried out under the General R/D Program of the Daegu Gyeongbuk Institute of Science & Technology (DGIST), funded by Ministry of Education, Science and Technology (MEST) of the Republic of Korea.

Keywords

  • Electrocatalyst
  • Metal-polymer composite
  • Oxygen reduction reaction
  • Polythiophene

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