High rates of oxygen reduction over a vapor phase-polymerized PEDOT electrode

Bjorn Winther Jensen, Orawan Winther-Jensen, Maria Forsyth, Douglas R. MacFarlane

Research output: Contribution to journalArticlepeer-review

373 Citations (Scopus)

Abstract

The air electrode, which reduces oxygen (O2), is a critical component in energy generation and storage applications such as fuel cells and metal/air batteries. The highest current densities are achieved with platinum (Pt), but in addition to its cost and scarcity, Pt particles in composite electrodes tend to be inactivated by contact with carbon monoxide (CO) or by agglomeration. We describe an air electrode based on a porous material coated with poly(3,4-ethylenedioxythiophene) (PEDOT), which acts as an O2 reduction catalyst. Continuous operation for 1500 hours was demonstrated without material degradation or deterioration in performance. O2 conversion rates were comparable with those of Pt-catalyzed electrodes of the same geometry, and the electrode was not sensitive to CO. Operation was demonstrated as an air electrode and as a dissolved O2 electrode in aqueous solution.

Original languageEnglish
Pages (from-to)671-674
Number of pages4
JournalScience
Volume321
Issue number5889
DOIs
Publication statusPublished - 2008 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • General

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