Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Strong magnetoelectrolysis effect during electrochemical reaction monitored in situ by high-resolution NMR spectroscopy

Full text
Author(s):
Gomes, Bruna Ferreira ; da Silva, Pollyana Ferreira ; Silva Lobo, Carlos Manuel ; Santos, Maiara da Silva ; Colnago, Luiz Alberto
Total Authors: 5
Document type: Journal article
Source: Analytica Chimica Acta; v. 983, p. 91-95, AUG 29 2017.
Web of Science Citations: 7
Abstract

The strong effect of magnetic field on the electrochemical (EC) reduction of a diamagnetic species was monitored in situ in a 600 MHz (14 T) NMR spectrometer. Throughout EC-NMR experiments, the diamagnetic species is influenced by the Lorentz force (cross product of current density and magnetic field), which in turn acts on analyte transport and, as a result, enhances reaction rates. This phenomenon, known as magnetoelectrolysis, has not been considered in several in situ EC-NMR studies in solution, electron paramagnetic resonance (EC-EPR) spectroscopy, and magnetic resonance imaging (EC-MRI) involving the oxidation and reduction of organic compounds and lithium ion batteries. Recently, we have demonstrated the presence of this effect in the electroplating of a paramagnetic ion species by monitoring it in situ in a low-field (0.23 T) NMR spectrometer. In this report, a ca. five-fold enhancement in the electroreduction rate of benzoquinone was observed when the analyses were performed in situ in the NMR spectrometer. Therefore, this work has the objective of informing the scientific community that before every electrochemical reaction carried out in situ in NMR, EPR and MRI apparatuses, the influence of the magnetic field on the reactions must be evaluated, since it can alter the mechanism and kinetics of the reaction which, if not taken into account may lead to wrong interpretations of the data. (C) 2017 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 12/22281-9 - NMR study of the magneto-convective phenomenon on paramagnetic ions during electrodeposition
Grantee:Bruna Ferreira Gomes Lobo
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)