Reduction of hydrogen peroxide production at anode of proton exchange membrane fuel cell under open-circuit conditions using ruthenium-carbon catalyst

Un Ho Jung, Seong Uk Jeong, Kook Chun, Ki Tae Park, Hyang Mee Lee, Dong Woong Choi, Sung Hyun Kim

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Abstract

This study examines the effect of hydrogen peroxide (H2O2) on the open-circuit voltage (OCV) of a proton exchange membrane fuel cell (PEMFC) and the reduction of H2O2 in the membrane using a ruthenium/carbon catalyst (Ru/C) at the anode. Each cathode and anode potential of the PEMFC in the presence of H2O2 is examined by constructing a half-cell using 1.0 M H2SO4 solution as an electrolyte and Ag/AgCl as the reference electrode. H2O2 is added to the H2SO4 solution and the half-cell potential is measured at each H2O2 concentration. The cathode potential is affected by the H2O2 concentration while the anode potential remains stable. A Ru catalyst is used to reduce the level of H2O2 formation through O2 cross-over at the interface of a membrane and the anode. The Ru catalyst is known to produce less H2O2 through oxygen reduction at the anode of PEMFC than a Pt catalyst. A Ru/C layer is placed between the Nafion® 112 membrane and anode catalyst layer and the cell voltage under open-circuit condition is measured. A single cell is constructed to compare the OCV of the Pt/C only anode with that of the Ru/C-layered anode. The level of hydrogen cross-over and the OCV are determined after operation at a current density of 1 A cm-2 for 10 h and stabilization at open-circuit for 1 h to obtain an equilibrium state in the cell. Although there is an increase in the OCV of the cell with the Ru/C layer at the anode, excessive addition of Ru/C has an adverse effect on cell performance.

Original languageEnglish
Pages (from-to)281-285
Number of pages5
JournalJournal of Power Sources
Volume170
Issue number2
DOIs
Publication statusPublished - 2007 Jul 10

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Keywords

  • Hydrogen peroxide
  • Open-circuit voltage
  • Oxygen cross-over
  • Proton exchange membrane fuel cell
  • Ruthenium/carbon catalyst

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

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