Magnetoelectrolysis study during the NMR-Electrochemistry in situ coupling

Author(s)

Bruna Ferreira Gomes Lobo

• Document type: Doctoral Thesis
• Press: São Carlos.
• Institution: Universidade de São Paulo (USP). Instituto de Química de São Carlos (IQSC/BT)
• Defense date: 2018-04-10

Examining board members

Luiz Alberto Colnago; Luiz Henrique Mazo; Tatiana Santana Ribeiro

• Advisor: Luiz Alberto Colnago

Abstract

Recently it was demonstrated that time domain Magnetic Nuclear Resonance (TD-NMR) is an important analytical technique which can be coupled to electrochemistry (EC-NMR). However, it was demonstrated in this work that NMR is not a passive technique, in other words it affects the electrochemical reactions performed in situ by increasing the reaction rate of mass transport and/or charge transfer limited reactions. This change in the reaction rate is caused by a phenomenon known as magnetoeletrolysis, it has as main resultant the Lorentz force, which is the vectorial product between the magnetic field vector and the ion flow produced during the electrolysis. The magnetic field effect on different electrochemical systems has been shown in the presence of magnetic fields of low and high resolution NMR spectrometers. In addition to the focus given to magnetoelectrolysis during the EC-NMR coupling, novel electrochemical cells were miniaturized for coupling with NMR by using a simple, rapid and robust method. Velocimetry measurements were also made using the spin-echo imaging technique with which it was possible to visualize and quantify the effect of the magnetic field acting on the in situ copper electrodeposition reaction. This work was the first to use the magnetic field of the NMR spectrometer to study magnetoelectrolysis. In addition, this doctoral thesis was the first to use a bench-top high resolution NMR spectrometer for coupling with electrochemistry. (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)