Tuning Redox State and Ionic Transfers of Mg/Fe-Layered Double Hydroxide Nanosheets by Electrochemical and Electrogravimetric Methods

Elise Duquesne; Stéphanie Betelu; Alain Seron; Ioannis Ignatiadis; Hubert Perrot; Catherine Debiemme-Chouvy

doi:10.3390/nano10091832

Tuning Redox State and Ionic Transfers of Mg/Fe-Layered Double Hydroxide Nanosheets by Electrochemical and Electrogravimetric Methods

Nanomaterials (Basel). 2020 Sep 14;10(9):1832. doi: 10.3390/nano10091832.

Authors

Elise Duquesne^{1

2}, Stéphanie Betelu², Alain Seron², Ioannis Ignatiadis², Hubert Perrot¹, Catherine Debiemme-Chouvy¹

Affiliations

¹ Laboratoire Interfaces et Systèmes Électrochimiques (UMR8235), Sorbonne Université, CNRS, 4 Place Jussieu, 75005 Paris, France.
² BRGM, French Geological Survey, 3 Avenue Claude Guillemin, 45000 Orléans, France.

Abstract

Studying the electrogravimetric behavior of Mg/Fe-layered double hydroxide (LDH) nanoparticles with an electrochemical quartz crystal microbalance demonstrates its pseudocapacitance properties of mix cation and anion exchanger. The electrochemical control of the oxidation state of iron constituting the layered sheets allowed anion intercalation/deintercalation into the LDH interlayer space. Concomitantly, in agreement with the pH of zero point of net charge of the Mg/Fe-LDH, the interfacial pH increase via catalyzed hydrogen evolution reaction allows cation electroadsorption onto the external surfaces of the nanoplatelets.

Keywords: electrochemical quartz crystal microbalance (EQCM); ionic exchanges; layered double hydroxide (LDH); redox reactions.