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Electron transfers in graphitized HZSM-5 zeolites

Abstract : In the present work, we report the electron transfers occurring after ionization of the guest molecules of t-stilbene incorporated in graphitized HZSM-5 zeolites and we compare these results with the data obtained previously for graphite-free zeolites. Complementary diffuse reflectance UV-vis and Raman scattering spectroscopies provide evidence for stabilization of long lived charge separated states as observed in non-graphitized ZSM-5. The spectral features indicate that these species are located in the channels of the zeolite structure. However, the pulsed EPR technique shows strong coupling between unpaired electrons and the 13C atoms in the case of graphitized zeolites while this interaction is not observed in normal zeolites. This is assigned to the presence of charge transfer complexes in the close vicinity of graphite areas and to the possible electron transfer to the graphitized domain. Using cyclic voltammetry, an electrochemical response is observed for the first time in such systems demonstrating the role played by graphite in the electron transfers.
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https://hal.univ-lille.fr/hal-03269523
Contributeur : Lilloa Université de Lille <>
Soumis le : jeudi 24 juin 2021 - 10:15:31
Dernière modification le : lundi 5 juillet 2021 - 12:02:43

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Alain Moissette, Isabelle Batonneau-Gener, Matthieu Hureau, Ludovic Pinard, Herve Vezin, et al.. Electron transfers in graphitized HZSM-5 zeolites. Physical Chemistry Chemical Physics, Royal Society of Chemistry, 2021, Physical Chemistry Chemical Physics, 23 (3), pp.1914-1922. ⟨10.1039/d0cp06148d⟩. ⟨hal-03269523⟩

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