Electrochemical study and physicochemical characterization of iron nanoparticles electrodeposited onto HOPG from Fe(III) ions dissolved in the choline chloride-urea deep eutectic solvent

Iron nanoparticles, FeNPs, were electrodeposited onto the HOPG electrode surface from Fe(III) ions dissolved in the choline chloride-urea eutectic mixture using potentiostatic current density transients. The morphology of the FeNPs, supported onto HOPG, was characterized by means of AFM and SEM. Fro...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2019-10, Vol.851, p.113453, Article 113453
Main Authors: Palomar-Pardavé, Manuel, Mostany, Jorge, Muñoz-Rizo, Ricardo, Botello, Luis E., Aldana-González, Jorge, Arce-Estrada, Elsa M., de Oca-Yemha, M. Guadalupe Montes, Ramírez-Silva, María Teresa, Romo, Mario Romero
Format: Article
Language:English
Subjects:
Chlorides
Choline
Current density
Deep eutectic solvent
Fe(III)
Ferric hydroxide
Iron
Morphology
Nanoparticles
Nucleation
Ureas
XPS
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Summary:Iron nanoparticles, FeNPs, were electrodeposited onto the HOPG electrode surface from Fe(III) ions dissolved in the choline chloride-urea eutectic mixture using potentiostatic current density transients. The morphology of the FeNPs, supported onto HOPG, was characterized by means of AFM and SEM. From these techniques it was found that most of the FeNPs were formed by nanostructured hemispheric particles, monodisperse in size (displaying diameters of (60 ± 8) nm with 30 nm height), that were homogeneously distributed on the HOPG surface. Furthermore, from EDX and XPS it was determined that the iron electrodeposit was constituted by core-shell type particles with zero-valence iron as the core and a shell composed by a mixture of FeO, Fe2O3, and Fe(OH)3. From analysis of experimental current density transients, it was found that the electrodeposition mechanism of FeNPs involves multiple 3D nucleation with diffusion controlled growth and that residual water reduction occurs on the growing surface of the FeNPs as the applied potential becomes more negative. These models involve contributions to the overall current due to: an adsorption process, iron 3D nucleation with diffusion-controlled growth and residual water reaction over the growing surfaces of the Fe nuclei. The proposed models help determining the charge percentage due to each individual contribution to the total process. HOPG-E/50 mM FeCl3, choline chloride-urea eutectic mixture. [Display omitted] •Fe(III) were dissolved in the choline chloride-urea eutectic mixture•FeNPs were deposited onto HOPG via mass-transfer controlled multiple 3D nucleation•FeNPs were formed by nanostructured hemispheric size-monodispersed particles•FeNPs were formed by Fe(0) as core and FexOy as shell•Residual water reduction occurred on FeNPs at the more negative potentials
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2019.113453