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PtRu/C (100% C) and PtRu/C-CeO2, PtRu/C-La2O3, PtRu/C-Nd2O3, and PtRu/C-Er2O3 (85% C and 15% rare earth) electrocatalysts were prepared in a single step by an alcohol-reduction process using H2PtCl6 6H2O and RuCl3 xH2O as metal sources, ethylene glycol as solvent and reducing agent, Vulcan XC72 and rare earth (RE) as support. The electrocatalysts were characterized by energy dispersive X-ray, X-ray...