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  • Portrait of Joaquin Rodriguez-Lopez for Feb. 18, 2020 seminar
    02/18/20 - 9:45 AM to 11:00 AM

    Student Seminar Series: Joaquin Rodriguez-Lopez

    Student Seminar Series

SECM as a Versatile Toolbox for Elucidating Manifold Challenges at the Electrochemical Interface

Elucidating and controlling interfacial reactivity is key to a broad scope of electrochemical studies of catalysts, sensors, and energy storage media. I will present a modern approach to understanding the electrochemical interface using scanning electrochemical microscopy (SECM), a scanned probe technique capable of delivering high spatiotemporal and chemical redox resolution at active surfaces. SECM uses an electrochemical probe to detect and quantify species (e.g. discharged products, homogeneous and heterogeneous intermediates) and the kinetics of processes (e.g. heterogeneous rate constants) through the use of highly localized electrochemical techniques deployed by such probe. [1,2] Our group has expanded the toolbox of SECM techniques to include Li-ion imaging modes that use amperometric ion sensors [3], surface-sensitive modes such as Surface Interrogation SECM, where the surface coverage and dynamics of adsorbed intermediates are explored, and the introduction of simultaneous and co-localized SECM-Raman investigations of a variety of interfaces. [4,5] Such in situ approaches give us insight regarding the reactivity of individual reacting sites within bulk electrodes, including their evolution during operation, and enable the construction of sensible structure–function correlations and electroanalytical models. Furthermore, the use of model interfaces such as mono- and multilayer graphene allow us to use surface-enhanced spectroscopic modes and, in general, to use laser excitation to control reactivity at the mesoscale in exciting new ways. In my talk, I will describe the main features of our instrumental setup, applications to interface and bulk nanomaterials, and emerging directions that amplify the role of hyphenated techniques coupled to the SECM into a highly versatile toolbox for manifold electrochemical processes. 

[1] Counihan, M. et al. ChemElectroChem 2019, 3507; [2] Krumov, M.R., et al. Anal. Chem. 2018, 3050; [3] Gossage, Z. T. et al. Chem. Sci. 2019, 10749; [4] Schorr, N.B. et al. Anal. Chem. 2018, 7848; [5] Schorr, N.B. et al. Curr. Op. Electrochem. 2018, 89. 

Joaquín Rodríguez-López

Joaquín Rodríguez-López is an associate professor of Chemistry at the University of Illinois at Urbana-Champaign. He performed undergraduate studies at Tecnológico de Monterrey, obtained a doctorate at the University of Texas at Austin, and did a post-doctorate with at Cornell University. 

Rodríguez-López’ group combines interests in electroanalytical chemistry and energy materials by developing chemically-sensitive methods for studying ionic and electronic reactivity in nano-structures, highly-localized surface features, and ultra-thin electrodes. 

Recognition of Rodríguez-López’ work has come through awards such as Science News 10 Scientists to Watch, the Society of Electroanalytical Chemistry Royce W. Murray Young Investigator Award, a Toyota-Electrochemical Society Young Investigator Fellowship, the Sloan Research Fellowship, the East Central Illinois American Chemical Society Chapter Distinguished Service Award, the Society of Analytical Chemists of Pittsburgh Starter Grant, and the ACS Division of Analytical Chemistry graduate fellowship award, and other awards including various travel grants to attend conferences on electrochemistry and analytical chemistry. 

  • Event Details

    Location: 331 Smith Hall
    Host: Celeste Rousseau