Preparing LaMnO3 nanocrystals on surface graphitized micro-diamond for efficient oxygen reduction
Electrocatalysts for oxygen reduction reactions are the key to metal–air batteries. In this work, surface graphitized microdiamond (GMD) with a diamond core and graphitic carbon shell are prepared by spark plasma sintering technique. Perovskite-type LaMnO3 (LMO) nanoparticle/surface GMD samples are...
Gespeichert in:
Veröffentlicht in: | Journal of alloys and compounds 2019-10, Vol.807, p.151684, Article 151684 |
---|---|
Hauptverfasser: | , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | Electrocatalysts for oxygen reduction reactions are the key to metal–air batteries. In this work, surface graphitized microdiamond (GMD) with a diamond core and graphitic carbon shell are prepared by spark plasma sintering technique. Perovskite-type LaMnO3 (LMO) nanoparticle/surface GMD samples are prepared by a sol–gel method using GMD as support. The LMO/GMD hybrid catalyst exhibits higher electrocatalytic activity than pure LMO and LMO/graphene. The suitability of the hybrid catalyst is tested for primary zinc–air batteries. Results demonstrate that the hybrid catalyst shows a high voltage plateau and slow decay rate. The excellent electrochemical performance is ascribed to the corrosion resistance of diamond, the coral-like structure of composite, the formation of electron transfer connector, and the spill effect of oxygen-containing species. Comparing the performance of differently sized graphitized diamond components in the catalysts proves that approximately 1 μm diamonds are extremely important for improving electrocatalytic activity.
[Display omitted]
•LaMnO3 nanoparticle/surface graphitized micro-diamond is prepared for the first time.•In alkaline medium, the combination of LaMnO3 and GMD has synergistic effect on ORR.•Provide a new application for micro-diamond. |
---|---|
ISSN: | 0925-8388 1873-4669 |
DOI: | 10.1016/j.jallcom.2019.151684 |