Issue 3, 2021

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.

Graphical abstract: Electron transfers in graphitized HZSM-5 zeolites

Article information

Article type
Paper
Submitted
26 Nov 2020
Accepted
21 Dec 2020
First published
21 Dec 2020

Phys. Chem. Chem. Phys., 2021,23, 1914-1922

Electron transfers in graphitized HZSM-5 zeolites

A. Moissette, I. Batonneau-Gener, M. Hureau, L. Pinard, H. Vezin, M. Perdicakis and A. Walcarius, Phys. Chem. Chem. Phys., 2021, 23, 1914 DOI: 10.1039/D0CP06148D

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