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

Wojciech OlszewskiCarlo MariniSatoshi KajiyamaMasashi OkuboAtsuo YamadaTakashi MizokawaNaurang Lal SainiLaura Simonelli
Published in: Physical chemistry chemical physics : PCCP (2023)
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 Ti 2 AlC and Ti 3 AlC 2 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.
Keyphrases
  • high resolution
  • ion batteries
  • magnetic resonance imaging
  • mass spectrometry
  • dual energy
  • electron microscopy
  • transition metal