Thermodynamic Aspects of Ion Intercalation in K h Fe k [Fe(CN) 6 ] l · m H 2 O Compounds: Application to the Everit's Salt/Prussian Blue Transition - Sorbonne Université Access content directly
Journal Articles Journal of Physical Chemistry B Year : 2006

Thermodynamic Aspects of Ion Intercalation in K h Fe k [Fe(CN) 6 ] l · m H 2 O Compounds: Application to the Everit's Salt/Prussian Blue Transition

Abstract

The K+ reversible processes for ion exchange in KhFek[Fe(CN)6]l·mH2O host compounds (Prussian Blue) were thermodynamically analyzed. A thermodynamic approach was established and developed based on the consideration of a lattice−gas model where the electronic contribution to the chemical potential is neglected and the ion−host interaction is not considered. The occupation fraction of the intercalation process was calculated from the kinetic parameters obtained through ac-electrogravimetry in a previous paper. In this way, the mass potential transfer function introduces a new way to evaluate the thermodynamic aspect of intercalation. Finally, based on the thermodynamic approach, the energy used to put each K+ ion into the host material was calculated. The values were shown to be in good agreement with the values obtained through transient techniques, for example, cyclic voltammetry. As a result, this agreement between theory and experimental data validates the thermodynamic approach considered here, and for the first time, the thermodynamic aspects of insertion were considered for mixed valence materials.

Dates and versions

hal-04171208 , version 1 (26-07-2023)

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D. Giménez-Romero, P. Bueno, J. García-Jareño, Claude Gabrielli, Hubert Perrot, et al.. Thermodynamic Aspects of Ion Intercalation in K h Fe k [Fe(CN) 6 ] l · m H 2 O Compounds: Application to the Everit's Salt/Prussian Blue Transition. Journal of Physical Chemistry B, 2006, 110 (39), pp.19364-19368. ⟨10.1021/jp061534a⟩. ⟨hal-04171208⟩
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