The effect of ammonia upon the electrocatalysis of hydrogen oxidation and oxygen reduction on polycrystalline platinum

Arnau Verdaguer Casadevall, Patricia Hernandez-Fernandez, Ifan E.L. Stephens, Ib Chorkendorff, Søren Dahl

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The influence of ammonium ions on the catalysis of hydrogen oxidation and oxygen reduction is studied by means of rotating ring-disk electrode experiments on polycrystalline platinum in perchloric acid. While ammonium does not affect the hydrogen oxidation reaction, the oxygen reduction reaction is severely poisoned. Poisoning at the cathode explains the majority of the losses observed in polymer electrolyte membrane fuel cells contaminated with ammonia. Voltammetry in deaerated solution suggest that the poisoning can be attributed to either ammonium oxidation or increased binding to OH species.
Original languageEnglish
JournalJournal of Power Sources
Volume220
Pages (from-to)205-210
ISSN0378-7753
DOIs
Publication statusPublished - 2012

Keywords

  • Fuel cells
  • Ammonia poisoning
  • Oxygen reduction reaction
  • Voltammetry
  • Rotating ring-disk electrode
  • Electrochemistry

Fingerprint Dive into the research topics of 'The effect of ammonia upon the electrocatalysis of hydrogen oxidation and oxygen reduction on polycrystalline platinum'. Together they form a unique fingerprint.

Cite this