Artículo
Evaluation of different Ni-semiconductor composites as electrodes for enhanced hydrogen evolution reaction
Gomez, Melisa Julieta
; Benavente Llorente, Victoria
; Hainer, Andrew; Lacconi, Gabriela Ines
; Scaiano, Juan Cesar; Franceschini, Esteban Andrés
; Lanterna, Anabel Estela
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Fecha de publicación:
08/2020
Editorial:
Royal Society of Chemistry
Revista:
Sustainable Energy and Fuels
e-ISSN:
2398-4902
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The use of earth-abundant materials for designing efficient and stable electrocatalysts is of paramount importance to facilitate large-scale production of hydrogen. In this work we developed a new series of electrodes based on Ni-semiconductor composites (Ni|SC) that are easy to synthesize (binder-free, economic and readily scalable method of synthesis), highly stable and active towards electrochemical hydrogen production under alkaline conditions. We showed the direct electrodeposition of composites (Ni|SC) from nickel-Watts plating baths modified by the addition of Nb2O5, Nb3(PO4)5, Bi2O3 and WO3 semiconductor particles. The electrodes were characterized by different techniques (electron and confocal microscopy, X-ray spectroscopy, X-ray diffraction, Raman spectroscopy, among others) before and after their electrochemical evaluation as catalysts for hydrogen evolution from water. In order to gain insights into their structure-activity relationship, the materials were also characterized by means of electrochemical analyses, i.e., cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy. All catalysts have onset potential values around -1.1 V vs. SCE and similar Tafel slopes (ca. 120 mV dec-1) corresponding to the Volmer reaction as the rate determining step of the reaction. These catalysts show an increase of up to 115% (for Ni|WO3) of hydrogen production current compared to conventional Ni catalysts, in most cases preserving great chemical and structural stability after short ageing under alkaline conditions. The composite catalysts were synthesized on low-cost nickel-plated stainless-steel supports, which make them excellent alternatives for replacing massive nickel electrodes in conventional alkaline electrolyzers.
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Articulos(INFIQC)
Articulos de INST.DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Articulos de INST.DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Citación
Gomez, Melisa Julieta; Benavente Llorente, Victoria; Hainer, Andrew; Lacconi, Gabriela Ines; Scaiano, Juan Cesar; et al.; Evaluation of different Ni-semiconductor composites as electrodes for enhanced hydrogen evolution reaction; Royal Society of Chemistry; Sustainable Energy and Fuels; 4; 8; 8-2020; 1-10
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