NiFeO/NiFe bilayer electrocatalyst for an efficient urea assisted water electrolysis
In this work a set of mono- and bi-layered nanostructured Ni–Fe electrocatalysts prepared by magnetron sputtering deposition in an oblique angle configuration have been tested as anodes for urea assisted water electrolysis. In a three-electrode cell, it was found that an oxide/metal bilayer outperfo...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/364935 |
| Acceso en línea: | http://hdl.handle.net/10261/364935 |
| Access Level: | acceso abierto |
| Palabra clave: | Urea-assisted water electrolysis Green hydrogen Magnetron sputtering, Bi-layer catalyst structure, Electrochemical reforming, Ni–Fe electrocatalyst http://metadata.un.org/sdg/3 Ensure healthy lives and promote well-being for all at all ages |
| Sumario: | In this work a set of mono- and bi-layered nanostructured Ni–Fe electrocatalysts prepared by magnetron sputtering deposition in an oblique angle configuration have been tested as anodes for urea assisted water electrolysis. In a three-electrode cell, it was found that an oxide/metal bilayer outperforms single metal or oxide layer configurations for the urea electro-oxidation. It is also found that the incorporation of Fe within the Ni structure stabilizes the electrodes likely because it produces a decrease in the surface poisoning of the electrocatalyst. The improved performance observed for the oxide/metal bilayer configuration has been attributed to a synergetic effect between the active (oxy)hydroxide Ni–Fe catalytic species at the outer layers and a high electrical conductivity through the underlying metallic layer. The bilayer electrocatalyst tested in an anion exchange membrane water electrolyser showed an overpotential decrease of 0.13 V when comparing urea oxidation vs. pure water electrolysis. Results prove a synergetic effect between the hydrogen production through water electrolysis and the removal of organic pollutants in water. |
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