Ionomer-Free NiFe/NiFeO Bilayer Oxygen Evolution Reaction Electrocatalyst Prepared by a Magnetron Sputtering at Oblique Angle Bottom-Up Deposition Method [Dataset]
This manuscript reports on a Ni/Fe-based bilayer catalyst developed to boost the oxygen evolution reaction in anion exchange membrane water electrolyzers. The electrochemical behavior toward the oxygen evolution reaction of several NiFe/NiFeO metal–oxide bilayer catalysts, prepared by magnetron sput...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | conjunto de datos |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/407191 |
| Acceso en línea: | http://hdl.handle.net/10261/407191 |
| Access Level: | acceso abierto |
| Palabra clave: | Scanning electron microscopy Oxygen evolution reaction Oblique angle bottom Membrane electrode assembly Thorough electrochemical characterization Electrode electrochemical cell Ray photoelectron spectroscopy Oxide nifeox single Oblique angle deposition Free anode electrode Electrochemical behavior toward Performing bilayer configuration Bilayer catalyst anode Electrochemical usage Raman spectroscopy Nife single Free nife Deposition method Bilayer catalysts Term stability Surface reactivity Superior performance Successful integration Several nife Results revealed Metal nife Manuscript reports Magnetron sputtering Layer catalyst Large areas Higher efficiency Flat stainless Chemical nature 64 cm |
| Sumario: | This manuscript reports on a Ni/Fe-based bilayer catalyst developed to boost the oxygen evolution reaction in anion exchange membrane water electrolyzers. The electrochemical behavior toward the oxygen evolution reaction of several NiFe/NiFeO metal–oxide bilayer catalysts, prepared by magnetron sputtering at oblique angle deposition (MS-OAD) on a flat stainless-steel substrate, was assessed in a three-electrode electrochemical cell in comparison with the behavior of both a metal NiFe and an oxide NiFeOx single-layer catalyst. The morphology and chemical nature of these catalysts, as prepared and after electrochemical usage, were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy. A thorough electrochemical characterization of the different catalyst formulations revealed a higher efficiency for the bilayer catalysts, in terms of both activity and long-term stability, and provided some clues to account for this superior performance in terms of morphology and surface reactivity of each catalyst. As a proof of concept, the best-performing bilayer configuration was then deposited onto a stainless steel felt porous transport layer (PTL) substrate and tested as an ionomer-free anode electrode in a membrane electrode assembly (MEA). Results revealed that the MS-OAD catalysts performed well when deposited on PTLs and that, under this configuration, a bilayer catalyst anode is slightly more efficient than the NiFe single-layer catalyst. Additionally, the possibility of scaling up the MS-OAD procedure to large areas has been demonstrated by the preparation of the bilayer catalysts on a 64 cm2 PTL and its successful integration and operation in a large prototype single cell. |
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