Surface reactivity of Li2MnO3: Structural and morphological impact - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Applied Surface Science Année : 2021

Surface reactivity of Li2MnO3: Structural and morphological impact

Résumé

This paper investigates the role of the stacking fault (5%, 20% and 50%) and the morphology of Li2MnO3 lamellar materials, issued from coprecipitation method with three annealing temperatures, on the surface reactivity. The structure and the morphology have been characterized by XRD, SEM and TEM. We studied the surface reactivity of these materials by combining X-ray photoemission spectroscopy (XPS), gaseous adsorption and first-principle calculations. An evolution of the reactivity toward the SO2 acid gaseous probe has been observed for the three materials, from pure redox mechanism toward mixed acid-base/redox mechanisms, respectively for 5% and 50% of stacking faults. We demonstrated that the electronic structure of Li2MnO3 being not modified by stacking faulted. Thus, the surface reactivity of faulted Li2MnO3 is not linked to the SF rate but only governed by the accessible crystalline surfaces and the manganese environments at the surface atomic layer. The formation of (0 0 1)-Li surface according to the Li-overstoichiometry on the extreme surface and the random particles shape of the more faulted materials are responsible of the reactivity tuning.
Fichier principal
Vignette du fichier
2021-012.pdf (1.31 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03075443 , version 1 (05-01-2021)

Identifiants

Citer

Ambroise Quesne-Turin, Delphine Flahaut, Germain Vallverdu, Laurence Croguennec, Joachim Allouche, et al.. Surface reactivity of Li2MnO3: Structural and morphological impact. Applied Surface Science, 2021, 542, pp.148514. ⟨10.1016/j.apsusc.2020.148514⟩. ⟨hal-03075443⟩
108 Consultations
28 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More