Improved oxygen reduction cathodes using polyoxometalate cocatalysts

Langmuir : the ACS Journal of Surfaces and Colloids
Anand V SankarrajCurtis Shannon

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 (PW12O40(3-) and PCoW11O39(5-) 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 PCoW11O39(5-) 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.

Citations

Mar 16, 2011·Physical Chemistry Chemical Physics : PCCP·Thomas Hsu-YaoYuYe J Tong
Feb 5, 2010·Angewandte Chemie·De-Liang LongLeroy Cronin

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