Modifying the electrochemical process of Li–O2 battery by integrated NiMn-layered double hydroxides substrate
As typical two-dimension material, layered double hydroxides (LDHs) attract great interest and are believed to be promising catalysts in Li–O2 battery due to their facile tunability of composition, structures and properties. However, the low electric conductivity and limited catalytic active site ex...
Gespeichert in:
Veröffentlicht in: | Journal of alloys and compounds 2021-03, Vol.856, p.157457, Article 157457 |
---|---|
Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | As typical two-dimension material, layered double hydroxides (LDHs) attract great interest and are believed to be promising catalysts in Li–O2 battery due to their facile tunability of composition, structures and properties. However, the low electric conductivity and limited catalytic active site exposure caused by the large particle size and severe lamella stacking are the main challenges. Herein, an interconnected, highly active and ultra-thin NiMn-LDHs is deposited on 3D Ni foam and used as integrated porous catalyst substrate (NiMn-LDHs substrate), the NiMn-LDHs substrate is functional as both current collector and catalyst layer, and the NiMn-LDHs substrate exhibits high catalytic activity and robust stability, the substrate successfully plays the function of tunning the electrochemical process of Li–O2 battery. The Li–O2 battery uses this kind of substrate exhibits much improved discharge capacity and long cycle performance compared with pristine Ni substrate. The benefit of the porous NiMn-LDHs in improving the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalytic activities is also supported by rotating disc electrode techniques. This work highlights the strategy of fabricating high efficient LDHs catalyst and provides a new direction for achieving highly efficient integrated catalytic cathode for practical use.
•NiMn-LDHs catalyst substrate is fabricated via a facile MOF-derived route.•The catalyst substrate can effective regulate the surface ORR and OER.•Li–O2 battery using this substrate exhibits high capacity, improved rate and cycle performances. |
---|---|
ISSN: | 0925-8388 1873-4669 |
DOI: | 10.1016/j.jallcom.2020.157457 |