The second Mechanics & Computation seminar of the year is announced below:
On the interaction between mechanics and chemistry: Two case studies in (i) Lithium Ion Batteries and (ii) Heterogeneous Catalysis
Prof. Pradeep R. Guduru
School of Engineering, Brown University, Providence, RI 02912, USA
Thursday, Nov 12 at 4 pm
Chemo-mechanical coupling, i.e., interaction between mechanical fields (stress, strain, …) and chemical phenomena is familiar in a number of problems in mechanics of materials. Examples include stress corrosion cracking, dislocation interaction with its local environment, the role of stress in microstructure evolution in certain alloys, etc. The basic idea is that the contribution of mechanical fields to the free energy and the chemical potential of certain species can tip the energy landscape to influence the chemical reaction rates in ways that may have practical implications. In this talk, we present investigations of chemo-mechanical interactions in the context of two energy technologies: (i) lithium ion batteries and (ii) heterogeneous catalysis. In the former, we demonstrate that the stress in an electrode is coupled to the potential of an electrochemical cell through solution thermodynamics and examine the possible practical implications. In the latter, we examine how externally applied stress fields on a catalyst can influence the catalytic efficiency in the context of oxygen reduction reaction (ORR) and the hydrogen evolution reaction (HER). By isolating elastic strain from the electronic structure effects (the so called-ligand effect), this study provides a better understanding of the processes that control electrocatalytic activity and can guide the design of strained core-shell nano-particle catalysts.
Prof. Guduru received his Ph.D. in Aeronautics (Minor: Materials Science) from California Institute of Technology in 2001. Following a postdoctoral position in the Division of Engineering at Brown University, he joined the Solid Mechanics faculty there as an Assistant Professor of Engineering in 2002. He is currently the James R. Rice Professor of Engineering at Brown University. Prof. Guduru’s research focuses on experimental mechanics; current problems of interest are at the interface between mechanics and chemistry and impact dynamics of energetic materials. Professor Guduru was the recipient of PECASE - Presidential Early Career Award for Scientists and Engineers — in 2007; and the National Science Foundation CAREER award in 2006. Prof. Guduru serves on the Editorial Advisory Boards of the Journal of the Mechanics and Physics of Solids and Acta Mechanica Sinica. He is an Associate Editor of Applied Mechanics Reviews.