Dr. Graeme Henkelman

 

 

Date & Time:

 

October 29, 2015 at 1PM

 

Location:

 

PGH 216

Dr Graeme Henkelman, UT Austin

 

 

Title: Computational methods for simulating long time scales and for catalyst design

 

 

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Abstract: 

 

A computational method will be presented for simulating the dynamics of atomic systems on time scales much longer than can be accessed with classical molecular dynamics.  In this adaptive kinetic Monte Carlo approach, possible reaction mechanisms available to the system are found by exploring the potential energy surface from minima to find nearby saddle points. Reaction rates are then calculated using harmonic transition state theory, and the system is propagated stochastically in time. Our algorithm is sufficiently efficient to model the evolution of systems at the density functional level of theory. I will show a few examples, including surface diffusion and chemical reactions at surfaces.  Using the calculated reaction pathways for a catalyst we can then start to design new catalysts computationally.  Specifically, I will show recent results from a collaborative effort with an experimental group to design, synthesize and test new nanoparticle catalysts for the oxygen reduction reaction.

 

Bio: 

 

Graeme Henkelman is a professor of chemistry at the University of Texas at Austin.  He did his undergraduate work in physics at Queen’s University in Canada, a PhD in chemistry at the University of Washington, and a postdoc at Los Alamos National Lab before starting at UT over ten years ago.  His research group has focused on computational methods for modeling reaction dynamics over experimental time scales.  These methods are applied to the challenge of developing new materials for energy applications including catalysts and batteries.