(418e) Quantitative Study of the Stability of Colloidal Metallic Nanoparticles with Different Shapes in Reactive Chemical Environments at Atomic Level

Understanding and controlling electrochemical interfaces at atomic and molecular levels have transformed electrochemistry into a science with clearly defined fundamental principles leading to significant impact on various electrochemical systems and devices. Although the principles guiding the activity of electrochemical reactions are quite well established, the driving forces that control stability are still poorly understood. Here we utilize in situ monitoring of the early stages of Pt, Pd, and Ni dissolution using the operando attenuated total reflectance surface enhanced infrared absorption spectroscopy (ATR-SEIRAS). Our unique operando ATR-SEIRAS method provides femtogram sensitivity levels that, in combination with other techniques, provide otherwise inaccessible information about the dissolution of colloidal metallic nanoparticles with different shapes in acidic environments, and thus deliver a more sensitive approach to understanding the structure-stability relationships of colloidal metallic nanocatalysts at atomic level.