Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7719022 | International Journal of Hydrogen Energy | 2014 | 6 Pages |
Abstract
In the presented work we investigate the influence of de-alloying carbon supported PtxCo1âx alloy nanoparticles (NPs) on their oxygen reduction reaction (ORR) activity. In our study we used a modification of a recently developed colloidal synthesis approach in order to prepare NPs of similar size, i.e. around 2Â nm in diameter, but varying initial Pt:Co ratios. The results show that using a surfactant is favorable to control the initial Pt:Co ratio. The initial composition of the catalyst however is lost upon introduction into an acid environment, i.e. the well-known effect of chemical de-alloying occurs. Interestingly, despite the fact that due to de-alloying almost all Co is removed from the PtxCo1âx NPs, a clear trend of increasing ORR activity with increasing initial Co content is observed. The results indicate that the process of chemical de-alloying is favorable for producing active ORR catalysts.
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Authors
Ioannis Spanos, César PelegrÃn Rellán, Lena Altmann, Marcus Bäumer, Matthias Arenz,