Langmuir, 24 (3), 632 -634, 2008. 10.1021/la703234n S0743-7463(70)03234-1
Web Release Date: January 8, 2008

Copyright © 2008 American Chemical Society

Improved Oxygen Reduction Cathodes Using Polyoxometalate Cocatalysts

Anand V. Sankarraj, Sridevi Ramakrishnan, and Curtis Shannon*

Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849-5312

Received October 17, 2007

In Final Form: December 11, 2007

Abstract:

We report on the influence of a series of transition-metal-substituted Wells-Dawson (P2W17MnO62(12 - n)-; M = WVI, FeII, CoII, RuII) and Keggin (PW12O403- and PCoW11O395-) anions on the oxygen reduction reaction (ORR) at Au, Pd, and Pt. Wells-Dawson POMs adsorbed on Au lead to large positive shifts of the ORR potential. The magnitude of the shift depends on the transition metal and is explained using a simple thermodynamic model. The best cathode performance was achieved using a PCoW11O395- cocatalyst and a Pt cathode. The +54 mV positive shift in the ORR potential that we observed is comparable to the performance of the best-known bimetallic catalysts.

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