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Platinum nanoparticles were supported on carbon nanofibers (CNFs) for their use as electrocatalyst for PEM fuel cells. Before platinum deposition, CNFs were oxidized using concentrated HNO 3 or a HNO 3 –H 2 SO 4 mixture as oxidizing agents. During these treatments, new surface oxygen groups were created. Moreover, the most severe treatments resulted in the shortening...
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