The local structures of Ti based MXene-type electrode materials have been studied by Ti K-edge X-ray absorption fine structure measurements as a function of temperature to obtain direct information on the local bond lengths and their stiffness. In particular, the parent MAX phases Ti2AlC and Ti3AlC2 and their etched MXene systems are characterized and their properties compared. We find that selective etching has a substantial effect on the local structural properties of the Ti based MXene materials. It leads to an increase in the interatomic distances, i.e. a decrease in the covalency, and corresponding bond stiffness, that is a likely cause of higher achievable performances. The obtained results underline the importance of the local atomic correlations as limiting factors in the diffusion capacity of ion batteries.

Investigating the local structure of Ti based MXene materials by temperature dependent X-ray absorption spectroscopy / Olszewski, Wojciech; Marini, Carlo; Kajiyama, Satoshi; Okubo, Masashi; Yamada, Atsuo; Mizokawa, Takashi; Saini, Naurang Lal; Simonelli, Laura. - In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - ISSN 1463-9076. - 25:4(2023), pp. 3011-3019. [10.1039/d2cp04759d]

Investigating the local structure of Ti based MXene materials by temperature dependent X-ray absorption spectroscopy

Saini, Naurang Lal;
2023

Abstract

The local structures of Ti based MXene-type electrode materials have been studied by Ti K-edge X-ray absorption fine structure measurements as a function of temperature to obtain direct information on the local bond lengths and their stiffness. In particular, the parent MAX phases Ti2AlC and Ti3AlC2 and their etched MXene systems are characterized and their properties compared. We find that selective etching has a substantial effect on the local structural properties of the Ti based MXene materials. It leads to an increase in the interatomic distances, i.e. a decrease in the covalency, and corresponding bond stiffness, that is a likely cause of higher achievable performances. The obtained results underline the importance of the local atomic correlations as limiting factors in the diffusion capacity of ion batteries.
2023
battery materials, local structure, MAXene
01 Pubblicazione su rivista::01a Articolo in rivista
Investigating the local structure of Ti based MXene materials by temperature dependent X-ray absorption spectroscopy / Olszewski, Wojciech; Marini, Carlo; Kajiyama, Satoshi; Okubo, Masashi; Yamada, Atsuo; Mizokawa, Takashi; Saini, Naurang Lal; Simonelli, Laura. - In: PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - ISSN 1463-9076. - 25:4(2023), pp. 3011-3019. [10.1039/d2cp04759d]
File allegati a questo prodotto
File Dimensione Formato  
Olszewski_Investigating_2023.pdf

solo gestori archivio

Tipologia: Versione editoriale (versione pubblicata con il layout dell'editore)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 1.37 MB
Formato Adobe PDF
1.37 MB Adobe PDF   Contatta l'autore

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1680143
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 3
  • ???jsp.display-item.citation.isi??? 2
social impact