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Science 1 August 2008:
Vol. 321. no. 5889, pp. 671 - 674
DOI: 10.1126/science.1159267
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Reports

High Rates of Oxygen Reduction over a Vapor Phase–Polymerized PEDOT Electrode

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

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.

Australian Centre for Electromaterials Science, Monash University, Clayton, Victoria 3800, Australia.

* To whom correspondence should be addressed. E-mail: bjorn.winther-jensen{at}eng.monash.edu.au

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Nitrogen-Doped Carbon Nanotube Arrays with High Electrocatalytic Activity for Oxygen Reduction.
K. Gong, F. Du, Z. Xia, M. Durstock, and L. Dai (2009)
Science 323, 760-764
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