A5079496169- Electrocatalysts for Energy Conversion
- Advanced Condensed Matter Physics
- Electronic and Structural Properties of Oxides
- Advancements in Solid Oxide Fuel Cells
- Corrosion Behavior and Inhibition
- Electrochemical Analysis and Applications
- Copper-based nanomaterials and applications
- CO2 Reduction Techniques and Catalysts
- Concrete Corrosion and Durability
- Advanced battery technologies research
- Magnetic and transport properties of perovskites and related materials
- Hydrogen embrittlement and corrosion behaviors in metals
- Non-Destructive Testing Techniques
University of Waterloo
2019-2024
National Research Council Canada
2024
Abstract Electrochemical Impedance Spectroscopy (EIS) is a crucial technique for assessing corrosion of metallic materials. The analysis EIS hinges on the selection an appropriate equivalent circuit model (ECM) that accurately characterizes system under study. In this work, we systematically examined applicability three commonly used ECMs across several typical material degradation scenarios. By applying Bayesian Inference to simulated data, assessed suitability these different conditions...
The chemistry underlying the activation of nickel hydroxide toward electrocatalytic oxygen evolution by incorporation iron remains a subject debate. We extract insights into role geometric strain on electrochemical behavior in this class materials blending aluminum, gallium, or disordered lattice. and electronic structure three binary composition series are found to be similarly influenced each additive cation. Density functional theory models indicate that cations asymmetrically impede...
Abstract The ability of layered perovskites to accommodate both oxygen vacancies and hyperstoichiometry provides a dimension tunability that makes them appealing for electrocatalytic applications, but the resulting ionic conductivity enables electron transfer reactions within bulk crystals. We report on stability La 2 CuO 4 in voltage regimes relevant reduction, hydrogen evolution CO reduction. Voltammetric experiments, X‐ray photoelectron spectroscopy diffraction reveal surface reactions....
Heterogeneous electrocatalytic reactions are believed to occur at a minority of coordination sites through series elementary that balanced by minor equilibria. These features mask changes in reaction sites, making it challenging directly identify and analyze or intermediates while studying mechanisms. Systematic perturbations system often yield systematic material properties behavior. Correlations between measurable parameters describing the structure behavior, therefore, serve as powerful...
Abstract The atomic proximity of two disparate structural motifs in interleaved structures such as that adopted by La 2 NiO 4 , which alternates rock salt and perovskite motifs, offers potential synergistic effects increased tunability for electrocatalyst behavior. Structural voltammetric analysis the intersecting composition series LaSrNi 1−y Fe y O 4+δ 2−x Sr x Ni 0.7 0.3 show tuning different cation sites uniquely affects structure Correlations between X‐ray diffraction Raman spectroscopy...
Layered perovskites such as La 2–x Sr x CuO 4 are active electrocatalysts for CO 2 reduction, but they suffer from structural instability under catalytic conditions. This is found to arise the reaction of with surface sites. Variable scan rate voltammetry shows growth a Cu-based redox couple when potentials cathodic 0.6 V vs. RHE applied in presence . Electrochemical impedance spectroscopy identifies state at this voltage, whose concentration increased by electrochemical reduction In situ...
Raman spectroscopic measurements on a series of perovskites as function the temperature and gaseous atmosphere reveal chemical reactions between CO2 La2CuO4 that alter thermal phase transitions inhibit synthesis pristine La2CuO4. Variable spectra acquired under O2 environments show synthesized ambient conditions undergoes not only two previously documented but also loss vibrations at ca. 200 °C we attribute to desorption chemisorbed CO2. Samples heated 700 then cooled room spectrum with many...
Electrochemical Impedance Spectroscopy (EIS) is a crucial technique for assessing corrosion of metallic materials. The analysis EIS hinges on the selection an appropriate equivalent circuit model (ECM) that accurately characterizes system under study. In this work, we systematically examined applicability three commonly used ECMs across several typical material degradation scenarios. By applying Bayesian Inference to simulated data, assessed suitability these different conditions and...