Upcoming seminars

Seminars at DIFFER cover a wide range of topics and are held on Thursdays at 11.15 AM in the seminar room of the institute (unless otherwise stated). Seminars are open to everybody. If you are interested in visiting a DIFFER seminar or want to subscribe to our mailing list, please follow the instructions for external visitors.

List all past seminars organized at DIFFER

Marc Koper
March 30th 2017
11:15 to 12:15
This talk will outline a simple but general analysis for multiple proton-electron transfer reactions, based on the microscopic theory of proton-coupled electron transfer reactions, recent developments in the thermodynamic theory of multi-step electron transfer reactions, and the experimental realization that many multiple proton-coupled electron transfer reactions feature decoupled proton-electron steps in their mechanism. It is shown that decoupling of proton and electron transfer leads to a strong pH dependence of the overall catalytic reaction, implying an optimal pH for high catalytic turnover, and an associated optimal catalyst at the optimal pH. When more than one catalytic intermediate is involved, scaling relationships between intermediates may dictate the optimal catalyst and limit the extent of reversibility that may be achievable for a multiple proton-electron-transfer reaction. These scaling relationships follow from a valence-bond-type binding of intermediates to the catalyst surface. The theory is discussed in relation to the experimental results for a number of redox reactions that are of importance for sustainable energy conversion, including the electrocatalytic reduction of CO2, focusing on the importance of charged intermediates, their pH dependence and structure sensitivity.
Wim Sinke
April 6th 2017
11:15 to 12:15
Abstract will follow soon.