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Xerogel–nanofiber carbon composites (XNCCs) have been easily synthesized by using a Ni catalyst\udsupported on carbon xerogel (CXG), growing randomly oriented carbon nanofibers (CNFs) within the\udcoralline-like structure of the xerogel (CXG). This novel composite combines the advantages of xerogel\udand fiber nanostructures. The interactions between these phases as well as their effect as a support on\udPt electrocatalysts for the oxygen reduction reaction (ORR) have been investigated. Platinum catalysts\udsupported on different XNCCs (varying in terms of CXG and CNF contents) as well as on bare CXG and\udCNFs have been synthesized using a microemulsion route. They have been characterized in terms of\udstructure, morphology and porosity and investigated for the ORR in a half-cell configuration. The catalyst\udsupported on the XNCC with a 44% CNF content shows the best electrochemical behavior. This catalyst\udformulation leads to a catalytic activity 5 times higher than that obtained on a Vulcan-based catalyst at\udlow overpotential and 2.5 times higher at large overpotential. Accelerated degradation tests also show\udbetter stability for the composite support-based catalyst. Compared to bare CNF and CXG supports, a\udstabilization effect is envisaged by the presence of highly graphitic CNFs within the composite structure.CNR-ITAE authors acknowledge the financial support through\udthe PRIN 2010-11 project “Advanced nanocomposite\udmembranes and innovative electrocatalysts for durable polymer\udelectrolyte membrane fuel cells (NAMED-PEM)”. CSIC-ICB\udauthors gratefully acknowledge financial support given by the\udMinistry of Economy and Competitiveness through the Project\udCTQ2011-28913-CO2-01.Peer reviewe

Towards new generation fuel cell electrocatalysts based on xerogel–nanofiber carbon composites