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by  |  08-Mar-2015 20:04

The oxygen reduction reaction (ORR) performance was improved by appearance of selenium oxides., in which a statistical distribution and an ordered positioning were concluded.

Subsequently, Behm found the selenium played a role in surface modification of ruthenium and increased the catalytic stability of ruthenium supported on carbon, so they called the cluster catalysts as selenium-modified ruthenium catalysts .

In recent years, the preparation of carbon supported ruthenium catalysts has attracted scientific attention due to the potential application the catalysts as a cathode catalyst in direct methanol fuel cell (DMFC) [3], [4] and [5].

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It was shown that the presence of selenium was the decisive factor to significantly improve the catalytic activity and stability compared to unmodified ruthenium nanoparticles.

A special selenization in the course of a one-step synthesizing technique resulted in the high ORR activity of the catalysts .

However, the catalytic activity was still unsatisfied for commercial application in DMFCs due to undesired catalyst particle aggregation and a shell of amorphous Se-containing byproducts.

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