Resultados de investigación

12 pages. -- Figure S1-S18. -- Table S1. Atomic percentages determined by XPS in the electrodes after OER. -- Table S2. Comparison of the CoFeP-based electrodes for OER in 1 M KOH in chronological order., The development of high current density anodes for the oxygen evolution reaction (OER) is fundamental to manufacturing practical and reliable electrochemical cells. In this work, we have developed a bimetallic electrocatalyst based on cobalt–iron oxyhydroxide that shows outstanding performance for water oxidation. Such a catalyst is obtained from cobalt–iron phosphide nanorods that serve as sacrificial structures for the formation of a bimetallic oxyhydroxide through phosphorous loss concomitantly to oxygen/hydroxide incorporation. CoFeP nanorods are synthesized using a scalable method using triphenyl phosphite as a phosphorous precursor. They are deposited without the use of binders on nickel foam to enable fast electron transport, a highly effective surface area, and a high density of active sites. The morphological and chemical transformation of the CoFeP nanoparticles is analyzed and compared with the monometallic cobalt phosphide in alkaline media and under anodic potentials. The resulting bimetallic electrode presents a Tafel slope as low as 42 mV dec–1 and low overpotentials for OER. For the first time, an anion exchange membrane electrolysis device with an integrated CoFeP-based anode was tested at a high current density of 1 A cm–2, demonstrating excellent stability and Faradaic efficiency near 100%. This work opens up a way for using metal phosphide-based anodes for practical fuel electrosynthesis devices., Peer reviewed

11 pages. -- Experimental Section. Chemicals. -- Synthesis of Hexaaminobenzene (HAB). -- Synthesis of C2N. --Synthesis of PdH0.58@C2N, Pd@C2N, PdH0.58 and PdH0.58/C2N. -- -- Structural characterization. -- Electrochemical Measurements. -- Computational method. -- Figures S1-S8. -- Table S1. Summary of the FOR activity and stability of Pd-based nanoalloys., The lack of electrocatalysts for the formate oxidation reaction (FOR) hampers the deployment of direct formate fuel cells (DFFCs). To overcome this limitation, herein, we detail the production of palladium hydride particles supported on C2N (PdH0.58@C2N) via a facile method. PdH0.58@C2N displays excellent FOR performance, reaching current densities up to 5.6 A·mgPd–1 and stable cycling and chronoamperometric operation. The Pd lattice expands due to the hydrogen intercalation. Besides, an electronic redistribution associated with the distinct electronegativity of Pd and H is observed. Both phenomena modify the electron energy levels, enhancing the activity and stability of the composite catalyst. More specifically, differential functional theory calculations show H intercalation to downshift the Pd d-band center in Pd0.58@C2N, weakening adsorbate binding and accelerating the FOR rate-determining step., Peer reviewed

Chemicals, material characterizations, structural characterization, electrochemical measurements, MEA fabrication and direct ethanol fuel cell performance test, theoretical modeling and calculations; additional TEM, AC-HRTEM, HRTEM, HAADF-STEM images, corresponding FFT spectrum and GPA analysis; XRD pattern; Tafel slope curve; schematic illustration of mechanism for EOR; CO-TPD and CO–DRIFTS spectra; 1H NMR spectra; work functions and electron density differences diagram; and calculation details of Faradaic efficiency, mass activity, price activity, Engineering lattice strain, electronic structure, and crystallinity in palladium alloys offers a promising approach to significantly enhance their electrocatalytic performance. In this work, we present a versatile strategy to synthesize Pd-based phosphide alloys integrated with non-noble metal atoms (Pd-M-P; M = Co, Ni, Cu), characterized by expanded lattice structures and a crystalline–amorphous core–shell architecture. Catalytic performance assessments revealed that CuPdP exhibits an impressive mass activity of 7.96 A mgPd–1 for the ethanol oxidation reaction (EOR), which is 10.6 times higher than that of commercial Pd/C. This performance enhancement can be attributed to the precisely engineered lattice tensile strain and the strong p–d hybridization interaction between P and Pd. Density functional theory calculations further confirmed that these factors facilitate enhanced OH adsorption and weakened CO adsorption, thereby significantly improving EOR performance. This study presents an effective strategy for the atomic-level engineering of palladium alloy nanomaterials to achieve good electrocatalytic performance, providing a method for designing highly active catalysts., Peer reviewed

11 pages. -- Experimental and theoretical methods. -- Results., Peer reviewed

SEM images and EDS spectra of MnxOy@Ni(OH)2 electrodes; DFT-calculated adsorption energies on NiOOH, Mn3O4, and NiOOH/Mn3O4–MnO2 surfaces; CV curves and scan rate-dependent behavior; analysis of diffusion and kinetic parameters; post-CV XPS spectra of Mn and Ni; chronoamperometric stability tests and LSV curves before/after operation; optimized structures of OER intermediates (*OH, *O, *OOH) under AEM and LOM pathways; ICP-OES analysis of Mn/Ni ratios; thermodynamic, kinetic, and electrochemical parameters for OER; XPS quantification of surface states pre- and postcycling; benchmarking of overpotential performance versus literature, We report a colloidal synthesis strategy for producing MnxOy@Ni­(OH)2 nanoheterostructures under mild conditions, i.e., low temperature and ambient pressure. The role of carboxylic acid ligands in directing the synthesis is systematically explored, revealing that lower ligand concentrations along with low-molecular weight molecules favor the formation of well-defined MnxOy@Ni­(OH)2 heterostructures. Electrochemical characterization demonstrates that the resulting nanocomposites exhibit significantly enhanced electrochemical surface area and oxygen evolution reaction (OER) activity compared to their single-component counterparts. Specifically, MnxOy@Ni­(OH)2 achieves a low overpotential of 299 mV at 10 mA cm–2, a Tafel slope of 61 mV dec–1, and a low charge transfer resistance of 9 Ω. The improved OER performance is attributed to the synergistic effect between the Ni­(OH)2 nanosheets, which facilitate *OOH intermediate formation, and the MnO2 component, known for its intrinsic catalytic activity. Additionally, Mn3O4 serves as a stabilizing phase and precursor to MnO2, contributing to the overall durability and structural integrity of the catalyst., Peer reviewed

CONTENIDO EXTENDIDO ADICIONAL: Análisis estadístico descriptivo y las medidas de distribución (media, error típico, desviación típica, varianza, asimetría y curtosis) del cuestionario de ética de la publicación científica en Psicología, Educación y Comunicación, España.

AUTORAS: María-Carmen Fonseca-Mora, Victoria Tur-Viñes y Begoña San-Miguel-Gutiérrez. ARTÍCULO: Ética y revistas científicas españolas de Comunicación, Educación y Psicología: la percepción editora. CONTENIDO EXTENDIDO ADICIONAL: Resultados del análisis de correspondencias múltiples. TABLA E: Valores-test del análisis de correspondencias múltiples (Se han considerado los valores-test iguales o superiores a 1,96 y con una frecuencia superior a 15 casos).

Respuestas al cuestionario online "Ética y revistas científicas españolas de Comunicación, Educación y Psicología: la percepción editora (V1)", bloque IV "Perfil de la revista" (Autoras: Tur-Viñes, V.; Fonseca-Mora, M.C.; Gutiérrez San-Miguel, B., 2013).