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Temperature tuned reaction pathways of CO electrooxidation in alkaline media

  • Junhua Jiang
  • , Andrzej Wieckowski

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

CO electrooxidation at Pt-group catalysts in alkaline media has been first studied in the intermediate temperature range of 80 to 150°C by means of cyclic voltammetry and chronoamperometry. Accelerated CO electrooxidation reaction kinetics has been achieved in this intermediate temperature. A new pathway involving a formate intermediate formed through the reaction of CO and hydroxide has been proposed to account for the accelerated kinetics. This is quite different from the CO electrooxidation in alkaline media at low temperature which follows a Langmuir-Hinshelwood (L-H) mechanism. This accelerated CO electrooxidation reaction kinetics would provide fundamentals for the development of fuel cell and hydrogen purification technologies since CO adsorbed on the catalyst surfaces or in bulk solutions can be oxidized at very low potential in the intermediate temperature alkaline media.

Original languageEnglish
Title of host publicationTutorials on Electrocatalysis in Low Temperature Fuel Cells
PublisherElectrochemical Society Inc.
Pages135-141
Number of pages7
Edition2
ISBN (Electronic)9781623320157
ISBN (Print)9781566779548
DOIs
StatePublished - 2012
EventTutorials on Electrocatalysis in Low Temperature Fuel Cells - 221st ECS Meeting - Seattle, WA, United States
Duration: May 6 2012May 10 2012

Publication series

NameECS Transactions
Number2
Volume45
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Conference

ConferenceTutorials on Electrocatalysis in Low Temperature Fuel Cells - 221st ECS Meeting
Country/TerritoryUnited States
CitySeattle, WA
Period05/6/1205/10/12

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