Improved Oxygen Reduction Cathodes Using Polyoxometalate Cocatalysts

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• 作者：Anand V. Sankarraj ; Sridevi Ramakrishnan ; Curtis Shannon
• 刊名：Langmuir
• 出版年：2008
• 出版时间：February 5, 2008
• 年：2008
• 卷：24
• 期：3
• 页码：632 - 634
• 全文大小：142K
• 年卷期：v.24,no.3(February 5, 2008)
• ISSN：1520-5827

文摘

We report on the influence of a series of transition-metal-substituted Wells-Dawson (P₂W₁₇MⁿO₆₂^{(12 - n)-}; M =W^VI, Fe^II, Co^II, Ru^II) and Keggin (PW₁₂O₄₀^3- and PCoW₁₁O₃₉^5-) anions on the oxygen reduction reaction (ORR) atAu, Pd, and Pt. Wells-Dawson POMs adsorbed on Au lead to large positive shifts of the ORR potential. The magnitudeof the shift depends on the transition metal and is explained using a simple thermodynamic model. The best cathodeperformance was achieved using a PCoW₁₁O₃₉^5- cocatalyst and a Pt cathode. The +54 mV positive shift in the ORRpotential that we observed is comparable to the performance of the best-known bimetallic catalysts.