Lucila Méndez De Leo

Bio

In 1997, I received my Bachelor's degree in Chemical Sciences from the Faculty of Exact and Natural Sciences (FCEN) at the University of Buenos Aires (UBA). Subsequently, I completed my doctoral thesis at the National Atomic Energy Commission under the supervision of Drs. Roberto Fernández Prini and Hugo Bianchi, studying electrolyte equilibria in aqueous solutions at high temperatures using UV-visible spectrophotometry, and received my Doctorate from the University of Buenos Aires in 2003.
Afterwards, I undertook two postdoctoral stays at the University of Delaware (USA) between 2003 and 2006. First, I worked in Dr. Robert Wood's laboratory on the thermodynamics of electrolytes, and later in Dr. Andrew Teplyakov's laboratory, redirecting my research towards surface physical chemistry. There, I prepared surfaces modified with monolayers and thin layers of organic compounds and characterized them, particularly through spectroscopic measurements.
Upon returning to Argentina in 2007, I began working at the Institute of Physical Chemistry of Materials, Environment, and Energy (INQUIMAE) at FCEN-UBA, within the Molecular Electrochemistry group led by Dr. Ernesto Calvo.
Currently, my research focuses on the preparation and study of nanostructured surfaces using electrochemical, spectroscopic, and spectroelectrochemical techniques, among others. In particular, we implemented the PMIRRAS technique, to which an electrochemical cell was coupled, allowing PMIRRAS spectroelectrochemical experiments and subtractively normalized interfacial infrared spectroscopy (SNIFTIRS).
I am an Independent Researcher at the National Scientific and Technical Research Council (CONICET) and an Associate Professor in the Department of Inorganic, Analytical, and Physical Chemistry at FCEN, UBA.

Research interests

Super and pseudo capacitors

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Both batteries and supercapacitors are energy storage devices that rely on electrochemical processes; however, their charge storage mechanisms are different, leading to different energy densities. The basic differences between supercapacitors and batteries lie in their different charge storage mechanisms and the materials and structures of their electrodes. Generally, batteries and fuel cells are designed to provide high energy density, storing large amounts of charge in electrodes through faradaic reactions, while supercapacitors can provide high power density due to surface charge storage mechanisms.

Pseudocapacitive materials store charge through redox reactions similar to batteries but at fast rates comparable to those of electrochemical double-layer capacitors, exhibiting an electrochemical response similar to that of a capacitor.

In our group, we synthesize carbons with meso- and micro-scale porosity, which are then surface-modified with redox molecules or polymers specially synthesized with redox functionalities, in order to develop materials that can be used to prepare pseudocapacitors. These materials are thoroughly characterized, and their electrochemical behavior as energy storage systems is studied.

Polymer embeded nanoparticles

Surfaces modified with nanoparticles (NPs) of metals, semiconductors, and magnetic materials have received significant attention due to their applications, especially in the areas of catalysis and electrochemical sensors. These "size-tunable" materials have the advantage of enabling property adjustment depending on the desired application.

One way to synthesize these NPs, allowing for control over their size and distribution on the surface, is through the alternate deposition of polymeric films (layer-by-layer self-assembly). These films trap the precursor ion and limit the free diffusion of ions near the electrode surface. In the case of metal ions, they are then reduced either chemically or through electrochemical reduction. Thus, polymeric films can act as nanoreactors, enabling the in-situ formation of electrocatalysts with electrical connectivity between the NPs and the underlying substrate.

Another method to obtain surfaces modified with metal NPs is by preparing the NPs in a solution stabilized by polymers, which are then deposited on the surface via layer-by-layer self-assembly.

The net result is a multicomponent nanocomposite formed by inorganic NPs dispersed in a molecularly assembled polymeric matrix.


In our group, we conduct a detailed and systematic study of the conditions for preparing the films, using different polymeric matrices and varying the metal precursors to obtain NPs of different sizes, elemental compositions, and spatial distributions, supported on flat substrates, capable of acting as heterogeneous catalysts. To evaluate the impact of these variables on the electrocatalytic performance of the nanostructured surfaces, we have chosen a series of electrochemical reactions of industrial/environmental interest, including:
     1.- The oxidation of short-chain alcohols (relevant for fuel cells).
     2.- The reduction of carbon dioxide (a greenhouse gas).

Using spectroscopic techniques available in our laboratory, we study the mechanisms of the reactions involved in the catalysis of each reaction, the reaction yields, and detect the intermediate products formed during the catalysis. We perform spectroelectrochemical experiments (controlled potential spectroscopy) that allow us to identify the products that form and adsorb on the electrode at different potentials.

Recent publications
  • Pomeraniec Altieri, N.; Coria-Oriundo, L. L.; Angelomé, P. C.; Battaglini, F.; Martínez Ricci, M. L.; Méndez De Leo, L. P. Unexpected Enhancement of pH-Stability in Au3+/Ag+ Loaded H-Bonded Layer-by-Layer Thin Films. Soft Matter 2023, 19 (31), 6018–6031. https://doi.org/10.1039/D3SM00893BDescargar
  • Magallanes, C.; Méndez De Leo, L. P.; González, G. A. Chelating and Construction Effects on a Self-Assembled Blend for Electrochemical Lead (II) Detection. ChemElectroChem 2022, 9 (15). Descargar https://doi.org/10.1002/celc.202200437. Descargar
  • Coria-Oriundo, L. L.; Herrera, S. E.; Méndez De Leo, L. P.; Battaglini, F. Current Response Enhancement According to the Doping Anion’s Nature in Redox Polyelectrolyte─Enzyme Assemblies. ACS Appl. Polym. Mater. 2022, 4 (10), 7759–7769. https://doi.org/10.1021/acsapm.2c01300. Descargar
  • Magallanes, C.; Aguirre, B. M.; González, G. A.; Méndez De Leo, L. P. Interaction of Aqueous Cu(II) with Carboxylic Acid and Alcohol Terminated Self Assembled Monolayers: Surface and Interfacial Characterization. Surf. Sci. 2020, 692. https://doi.org/10.1016/j.susc.2019.121529. Descargar
  • Horwitz, G.; Calvo, E. J.; Méndez De Leo, L. P.; De La Llave, E. Electrochemical Stability of Glyme-Based Electrolytes for Li-O2batteries Studied by: In Situ Infrared Spectroscopy. Phys. Chem. Chem. Phys. 2020, 22 (29), 16615–16623. https://doi.org/10.1039/d0cp02568b. Descargar
  • Pedre, I.; Méndez De Leo, L. P.; González, G. A. Cu2+ Ion-Sensitive Surface on Graphite Electrodes. Anal. Bioanal. Chem. 2019, 411 (29), 7761–7770. https://doi.org/10.1007/s00216-019-02142-0. Descargar
  • Maldonado, L.; Debais, G.; Davia, F.; Méndez De Leo, L. P.; Tagliazucchi, M. Interpolymer Complexes of Poly(Sulfonic Acid)s and Poly(Ethylene Oxide): An Unexpected Association. Soft Matter 2019, 15 (45), 9318–9324. https://doi.org/10.1039/c9sm01768b. Descargar
  • Méndez De Leo, L. P. Chemical Functionalization with Electroactive Species. In Encyclopedia of Interfacial Chemistry: Surface Science and Electrochemistry; 2018; pp 622–627. https://doi.org/10.1016/B978-0-12-409547-2.13893-4. Descargar
  • Calvillo, L.; Mendez De Leo, L1.; Thompson, S. J.; Price, S. W. T.; Calvo, E. J.; Russell, A. E. In Situ Determination of the Nanostructure Effects on the Activity, Stability and Selectivity of Pt-Sn Ethanol Oxidation Catalysts. J. Electroanal. Chem. 2018, 819, 136–144. https://doi.org/10.1016/j.jelechem.2017.09.060. Descargar
Funding
  • UBACYT 2022-2024 (20020220400015BA). Nanostructured Surfaces containing metal nanoparticles in polymer films – Preparation, Characterization, and Modeling. Director: Lucila Méndez De Leo, (PI: Lucila P. Méndez De Leo, Co-PI: Lucy Coria Oriundo).
  • High Impact Federal Projects 2023: “Federal Initiative for the Development of Sustainable Materials and Processes for Energy Storage” PI: Alvaro Yamil Tesio, Co-PI: Fernando Fungo, Santiago Herrera, and Norma Lis Robles. Role: Researcher.
  • PICT-2020-SERIEA-01758. Supramolecular platforms containing metal nanoparticles embedded in polymers. Development and physicochemical characterization. PI: Lucila P. Méndez De Leo, Co-PI: Santiago Herrera.
  • PIP 2021-2023 (11220200102008CO): Metal Nanoparticles to Optimize Charge Transport in Electroactive Polymers: Construction of Model Systems and Mechanistic Studies. PI: Mario Tagliazucchi, Co-PI: Santiago Herrera, Lucila Méndez De Leo.

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