3M University Lecturer in Chemistry 2017 ~ Prof. Jim Mayer
Tuesday, May 16, 2017
James M. Mayer
Charlotte Fitch Roberts Professor of Chemistry
New Haven, CT
will present a talk entitled:
LECTURE 2 — Proton-Coupled Electron Transfer Reactions of Colloidal Metal Oxide Nanocrystals: a different look at interfacial redox chemistry.
Abstract: Interfacial charge transfer reactions are key to the behaviour of many devices and technologies and are prevalent in the environment. They are often described as pure electron (or hole) transfer processes. However, many of the important processes, from energy production and storage to corrosion, are proton-coupled electron transfer (PCET) processes. Similarly, batteries inherently involve cation-coupled electron transfer. These processes are not easily described with the electronic energy level model, starting from band theory, that dominates the thinking in this area. This talk will explore how protons and other ions affect the thermodynamics and kinetics of interfacial redox reactions, and how an alternative model could be developed. Colloidal ZnO and TiO2 nanocrystals are interesting PCET reagents, with their reduced forms readily transferring e– and H+ (equivalent to a hydrogen atom, H•) to organic reagents. Redox reactivity of ceria nanocrystals, metal-organic frameworks (MOFs) and high surface area molybdenum nitride (Mo2N) may also be discussed. It is suggested that chemical change of the reacting materials is a key feature of solid-solution interfaces at the nanoscale.
Department of Chemistry