An efficient route to chemically functionalize reduced graphene oxide (rGO) with ruthenium organometallic compounds and the subsequent anchorage of Pt nanoparticles is reported. Two organometallic complexes, [(η6‐C6H5OCH2CH2OH) RuCl2]2 (Ru‐dim) and [(η6‐C6H4(CHMe2)Me)RuCl2]2 (Ru‐cym), as well as commercial RuCl3 ⋅ XH2O (Ru‐com) have been synthetized an used as functionalizing agents. By implementing a conventional polyol synthesis method, the Pt/rGORu‐dim, Pt/rGORu‐cym, Pt/rGORu‐com and Pt/rGO nanocatalysts have been synthetized. Characterization by XRD indicates that the presence of Ru leads to the formation of Pt−Ru alloyed phases due to overlapping of Pt fcc and Ru hcp reflections. When characterized for the methanol oxidation reaction (MOR) in acid media, Pt/rGORu‐dim reached a mass current density of 491.49 mA mgPt−1, higher than those generated by the other nanocatalysts. The results show that the functionalization of rGO with Ru‐dim remarkably increases the catalytic activity of Pt for the MOR, suggesting Pt−Ru metal−metal interactions that promotes the anodic reaction.

The catalytic activity and electrochemical stability of Pd-CeO 2-NR /C (CeO 2-NR : cerium oxide nanorods) for the Oxygen Reduction Reaction (ORR) and the Ethanol Oxidation Reaction (EOR) is shown in alkaline media and compared to Pd/C. Evaluation of catalytic activity for the ORR in a Rotating Ring Disc Electrode (RRDE) setup , shows that Pd-CeO 2-NR /C promotes the reaction with a percentage of hydrogen peroxide production (%H 2 O 2) around 2-4 %, and an electron transfer number (n) close to 4. Tafel plots demonstrates higher mass and specific activities of Pd-CeO 2-NR /C than Pd/C. Moreover, from cyclic voltammetry tests, Pd-CeO 2-NR /C shows a higher mass catalytic activity (j m = 697 mA mg À 1 Pd) for the EOR at a more negative onset potential (E onset = 0.29 V/RHE) than Pd/C. After Accelerated Degradation Tests (ADT), Pd-CeO 2-NR /C retains ∼ 98 % of its Electrochemically Active Surface Area (ECSA), higher than ∼ 51 % of Pd/C. After ADT, the performance of Pd-CeO 2-NR /C remains similar for the ORR, while it is significantly higher for the EOR, compared to Pd/C. Thus, the addition of CeO 2-NR enhances the electrocatalytic behavior and stability of Pd towards the ORR and the EOR.