Influence of Halide Ions on Anodic Oxidation of Ethanol on Palladium

Ashok Kumar, Daniel Buttry

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Ethanol oxidation on polycrystalline palladium electrodes in alkaline media was studied in the presence of halide ions. Addition of halide ions decreased the ethanol oxidation peak current monotonically as a function of increasing halide concentration. The extent of poisoning was found to be in the order I > Br > Cl. Thus, Cl ions show appreciable inhibition of ethanol oxidation peak current at [Cl] ~ 10−3 M, whereas Br and I inhibit ethanol oxidation even at [Br] or [I] ~ 10−6 M. The potential of the ethanol oxidation peak shifted positive with increasing halide ion concentration. The extent of the shift was found to be in the order I > Br > Cl. This study is relevant due to the widespread use of palladium halide complexes in the production of Pd electrocatalysts for ethanol oxidation and other electrocatalytic reactions.

Original languageEnglish (US)
Pages (from-to)201-206
Number of pages6
JournalElectrocatalysis
Volume7
Issue number3
DOIs
StatePublished - May 1 2016

Keywords

  • Competitive adsorption
  • Ethanol oxidation
  • Fuel cell
  • Halides
  • Palladium
  • Surface poisoning

ASJC Scopus subject areas

  • Electrochemistry

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