NAP-XPS Probes the Electronic Structure of the Mg–Al–Cl Layered Double Hydroxide upon Controlled Hydration - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry C Année : 2023

NAP-XPS Probes the Electronic Structure of the Mg–Al–Cl Layered Double Hydroxide upon Controlled Hydration

Résumé

The hydration of [Mg2Al(OH)6]+[Cl–, yH2O] LDH was investigated by volumetric water adsorption, X-ray diffraction, Fourier Transformed Infrared (FTIR) sepctroscopy, and Near Ambient Pressure X-ray Photoelectron Spectroscopy (NAP-XPS). It was demonstrated that water uptake into interlayer region can be quantified by NAP-XPS. The LDH's electronic structure is assessed for increasing relative humidity (RH) up to 0.044. The Cl 2p level appears essentially unaffected by water uptake, but as supported by DFT calculation, H-bonds between chloride and water induce Cl 3p orbitals splitting. At RH = 0.7, LDH is covered by a water film that contains Mg and Cl species but no Al. Soft X-ray radiolysis of hydrated Cl species induces the formation of oxidized Cl species.
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Dates et versions

hal-04029492 , version 1 (15-03-2023)

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Romain Coustel, Anthony Boucly, Erwan André, Arnaud Di Bitetto, Fabrice Bournel, et al.. NAP-XPS Probes the Electronic Structure of the Mg–Al–Cl Layered Double Hydroxide upon Controlled Hydration. Journal of Physical Chemistry C, 2023, 127 (8), pp.4144-4153. ⟨10.1021/acs.jpcc.2c05362⟩. ⟨hal-04029492⟩
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