Person:
Segura Castedo, José Luis

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First Name
José Luis
Last Name
Segura Castedo
URI
https://hdl.handle.net/20.500.14352/76122
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Química Orgánica
Area
Química Orgánica
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    Scalable synthesis and electrocatalytic performance of highly fluorinated covalent organic frameworks for oxygen reduction
    (Angewandte Chemie International Edition, 2023) Martínez‐Fernández, Marcos; Martínez‐Periñán, Emiliano; Peña Ruigómez, Alejandro de la; Cabrera Trujillo, Jorge Juan; R. Navarro, Jorge A.; Aguilar Galindo, Fernando; Rodríguez‐San‐Miguel, David; Ramos, Mar; Vismara, Rebecca; Félix Zamora; Lorenzo, Encarnación; Segura Castedo, José Luis
    Abstract In this study, we present a novel approach for the synthesis of covalent organic frameworks (COFs) that overcomes the common limitations of non‐scalable solvothermal procedures. Our method allows for the room‐temperature and scalable synthesis of a highly fluorinated DFTAPB‐TFTA‐COF, which exhibits intrinsic hydrophobicity. We used DFT‐based calculations to elucidate the role of the fluorine atoms in enhancing the crystallinity of the material through corrugation effects, resulting in maximized interlayer interactions, as disclosed both from PXRD structural resolution and theoretical simulations. We further investigated the electrocatalytic properties of this material towards the oxygen reduction reaction (ORR). Our results show that the fluorinated COF produces hydrogen peroxide selectively with low overpotential (0.062 V) and high turnover frequency (0.0757 s−1) without the addition of any conductive additives. These values are among the best reported for non‐pyrolyzed and metal‐free electrocatalysts. Finally, we employed DFT‐based calculations to analyse the reaction mechanism, highlighting the crucial role of the fluorine atom in the active site assembly. Our findings shed light on the potential of fluorinated COFs as promising electrocatalysts for the ORR, as well as their potential applications in other fields.
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    Following the light: 3D-printed COF@poly(2-hydroxyethyl methacrylate) dual emissive composite with response to polarity and acidity
    (Journal of Materials Chemistry A, 2022) Martínez-Fernández, Marcos; Gavara, Raquel; Royuela, Sergio; Fernández-Ecija, Laura; Ignacio Martínez, José; Zamora, Félix; Segura Castedo, José Luis
    A new imine-based covalent organic framework (COF) functionalized in its cavities with moieties of the chromophore Nile Red has been synthesized and characterized. Using mechanical (ultrasonics) and chemical (acid-self-exfoliation) methods, exfoliation of the COF powder has been explored in water and water/organic media. In the latter, the obtained colloids exhibit dual emission originating from the Nile Red units (red) and the COF framework (green) that can be employed to prepare ratiometric sensors of polarity and acidity. Thus, taking advantage of the in situ exfoliation of the material in methacrylic monomers, free-standing polymeric films that preserve the optical properties of the exfoliated COF have been prepared. Finally, 3D liquid crystal display (LCD) additive manufacturing has been employed to prepare the dual emissive composites as tailored 3D-printed objects.