Interfacial electron flow in a Fe2P@NPC(core)/NiCo LDH(shell) heterostructure enables site-specific electronic-state modulation for bifunctional oxygen electrocatalysis
[EN] Efficient bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are vital for next-generation rechargeable Zn-air batteries (ZABs). Yet, achieving robust interfacial coupling and precise electronic state matching between ORR and OER sites remains...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2026 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/233174 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/233174 |
| Access Level: | acceso embargado |
| Palabra clave: | Active site assembly Multiple-bridged interface Electron density distribution Oxygen reduction Oxygen evolution |
| Sumario: | [EN] Efficient bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are vital for next-generation rechargeable Zn-air batteries (ZABs). Yet, achieving robust interfacial coupling and precise electronic state matching between ORR and OER sites remains challenging. Here, we devised a proof-ofconcept strategy based on a multiple-bridged interface that induced directed electron flow between ORR-active Fe2P@N/P-doped carbon (NPC) and OER-active NiCo-layered double hydroxides (LDH). This configuration bridged Fe2P to the NPC substrate via Fe-N bonds and formed a semi-coherent interface with LDH, resulting in a bifunctional catalyst with an exceptionally low Delta E of 0.581 V. When integrated into ZABs, the catalyst delivered a peak power density of 220 mW/cm2, a specific capacity of 792 mAh/gZn, and decent cycling stability. In-situ measurements and theoretical analyses revealed charge transfer from LDH through Fe2P to NPC across the interface, enabling site-specific electronic-state modulation. This generated an electron-deficient LDH favorable for OER while optimizing the electronic state of Fe2P for enhanced ORR activity. This facilitated rapid *O to *OOH conversion at LDH sites during OER and promoted *OH desorption at Fe2P sites during ORR. Therefore, our work shows that adequate interfacial charge transfer enables site-specific electronic state control for synergistic oxygen electrocatalysis. |
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