Servando López León

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Papers by Servando López León

Electrochemical and Spectral Properties of Neodymium, Lanthanum, Europium and Uranium Compounds in Room Temperature Ionic Liquids

by Veronika Zinovyeva and Servando López León

In this context, our study is devoted to electrochemical and spectral properties of neodymium (... more In this context, our study is devoted to
electrochemical and spectral properties of
neodymium (Nd(TFSI)3), lanthanum
(Ln(TFSI)3), europium (Eu(CF3SO3)3 and
Eu(TFSI)3) and uranium (UCl6
2-, UO2(CF3SO3)2,
UO2Cl4
2- and UO2Br4
2-) compounds in a series
of RTILs. The selected RTILs consist of
bis(trifluoromethylsulfonyl)imide (TFSI) or
bis(fluorosulfonyl)imide (FSI) anions and
trihexyltetradecylphosphonium (THTDP),
butylmethylpyrrolidinium (BMPyr),
methyltributylammonium (MTBA) or 1-butyl-3-
methylimidazolium (BMIM) cations.

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ELECTRODEPOSITION OF LANTHANUM IN THE ROOM TEMPERATURE IONIC LIQUIDS

Our work is focused on the electrochemical behavior of lanthanum in ILs based on the bis(triflu... more Our work is focused on the
electrochemical behavior of lanthanum in ILs
based on the bis(trifluoromethanesulfonyl)imide
(TFSI) anion. Different parameters are
examined such as the IL cation (imidazolium,
pyrrolidinium, ammonium, phosphonium), the
lanthanum ligand (TFSI, halide or dicyanamide
anions) and the working electrode material
(platinum, gold, glassy carbon, boron doped
diamond). The redox properties are essentially
studied by cyclic voltammetry and
chronoamperometry. This electroanalysis allows
us to determine the experimental conditions
allowing the formation of a deposit. Electrolysis
are then carried out to prepare quantitative
lanthanum deposit which is analyzed by several
techniques (SEM, AFM, XRF, XPS).

Electrodeposition of actinides in room temperature ionic liquids

ILs based on the bis(trifluoromethylsulfonyl)imide anion ((CF3SO2)2N-, noted TFSI-) have recently... more ILs based on the bis(trifluoromethylsulfonyl)imide anion ((CF3SO2)2N-, noted TFSI-) have recently gained a growing of interest because of their hydrophobic character, their superior chemical and thermal stability, their low viscosity, low melting point, high conductivity and high radiolytic stability. All of these criteria are very important for electrodeposition of actinides and lanthanides, known to be very electropositive elements. These TFSI - based ILs have then been selected to study the electrodeposition of neodymium and lanthanum. The work has been focused on the Nd(TFSI)3 and La(TFSI)3 salts, which are very water sensitive. Moreover, the redox properties of both ILs and metallic salts depend on the water content. All experiments have then been carried out in an argon – filled dry box (H2O < 10 ppm ; O2 < 1 ppm).

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Nickel Electrodeposition from Protic Ionic Liquids Based on Carboxylate Anions as Electrolyte: II. Electrodeposition from 2- hydroxyethyl Ammonium Propionate.

Ionic Liquids (ILs) are a new kind of solvents that can be used as alternative solvents in order ... more Ionic Liquids (ILs) are a new kind of solvents that can be used as alternative solvents in order to
improve the chemical or environmental performances of aqueous electrodeposition processes,
commonly based on the use of hazardous chemicals. In this work we study the feasibility to use 2-
hydroxyethyl ammonium propionate as solvent for the electrodeposition of nickel. Results shown that
in this reaction medium, it is possible to obtain pure and homogeneous deposits of nanocrystalline
nickel. These deposits grow with an initial 3D- and after following a 2D-mechanism, with a roughness
and crystal size, dependent on the electrodeposition conditions.

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