Examinando por Autor "Gordo, Elena"

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    Effect of the graphene-based material on the conductivity and corrosion behaviour of PTFE/graphene-based composites coatings on titanium for PEM fuel cell bipolar plates
    (Elsevier, 2024-09) Romero, Carlos; Domínguez, Carlota; Villemur, Juan; Botas, Cristina; Gordo, Elena
    Titanium is widely used as a material for bipolar plates (BP) PEM fuel cells, but they require conductive coatings that help with corrosion and have low interfacial contact resistance (ICR). Among many materials, polymer composites reinforced with graphene nanoparticles have the potential to become an effective coating, but the influence of different types of graphene-based materials on the performance remains has not been properly established. In this study, different nanoparticles (graphene monolayers, reduced graphene oxide and few-layer graphene) were used to process PTFE/graphene composite coatings for Ti, and their performance was evaluated. Most of the coating formulations improved the corrosion resistance of the Ti in one or two orders of magnitude, but only the combination of few-layer graphene and carbon black as additive resulted in an ICR of 12 mΩcm2, in range with the target values.
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    Processing and surface modification of titanium open cell porous structures for PEM fuel cell bipolar plates
    (Elsevier, 2024-01-02) Romero, Villarreal; Benedetto, Davide; Gordo, Elena
    Bipolar plate (BP) and porous transport layer (PTL) materials and designs are critical for the performance of a proton exchange membrane fuel cell (PEMFC) and electrolyser (PEMEC) due to their role as fluid distributor and electron transporter between cells. Designs based on open cell porous structures require a good control on the porosity features. The aim of this work is to use powder metallurgy to manufacture titanium porous structures and the use of suitable surface modification techniques that can improve the performance of the PEM systems, focusing on fuel cells. Using the space holder method, porous structures of up to 63% porosity and controlled pore size can be processed to tailor the characteristics for an optimal design and, through a simple gas nitriding treatment, the performance of the material in terms of interfacial contact resistance (below 10 mΩcm2 after corrosion) and corrosion resistance (below 1 μAcm−2) are improved for both dense and porous structures.