Prof. Jillian L. Dempsey     
Associate Professor
University of North Carolina at Chapel Hill, U.S.

Date: November 17, 2021
Time: 1300h ET
Sponsors:  Hiden Analytical, Royal Society of Chemistry

The conversion of energy-poor feedstocks like water and carbon dioxide into energy-rich fuels involves multi-electron, multi-proton transformations. In order to develop catalysts that can mediate fuel production with optimum energy efficiency, this complex proton-electron reactivity must be carefully considered. Using a combination of electrochemical methods and time-resolved spectroscopy reveals new details of how molecular catalysts mediate the reduction of protons to dihydrogen and the experimental parameters that dictate catalyst kinetics and mechanism. These studies create opportunities to promote, control, and modulate the proton-coupled electron transfer reaction pathways of catalysts.

Benefits of attending the webinar

Learn about:

• How molecular catalysts are being used to mediate fuel generation;
• How to elucidate mechanisms of coupled chemical reactions from cyclic voltammetry experiments;
• Find out more about proton-coupled electron transfer.

Raphaële J. Clément     
Professor
Materials Department
University of California, Santa Barbara, U.S.  

Date: October 27, 2021
Time: 1300h ET
Sponsors:  Hiden Analytical, Royal Society of Chemistry, American Chemical Society Materials Letters, JEOL USA, Inc. 

The development of next-generation solid state ion conductors hinges on an understanding of microscopic diffusion mechanisms and the identification of roadblocks along macroscopic diffusion pathways (e.g., intragrain defects and grain boundaries). (more…)

Hiroshi Imahori
Professor
Department of Molecular Engineering
Graduate School of Engineering
Kyoto University, Japan

Date: September 22, 2021
Time: 1000h ET
Sponsors: Hiden Analytical, Gamry Instruments, BioLogic USA

Shirley Meng
Professor
University of California, San Diego, U.S.

Date: September 15, 2021
Time: 1300h ET
Sponsors: Gamry Instruments, Hiden Analytical, Nor-Cal Products, BioLogic USA

(more…)

Amy C. Marschilok, Ph.D.
Co-Director, Institute for Electrochemically Stored Energy
Associate Professor, Department of Chemistry
Adjunct Faculty, Materials Science and Chemical Engineering
Stony Brook University, U.S.

Energy Storage Division Manager and Scientist, Interdisciplinary Science Department
Brookhaven National Laboratory, U.S.

Date: August 25, 2021
Time: 1300h EDT
Sponsor: Hiden Analytical

(more…)

Veronica Augustyn
Associate Professor of Materials Science & Engineering
University Faculty Scholar
North Carolina State University, U.S.

Date: August 18, 2021
Time: 1000h EDT
Sponsor: Hiden Analytical

Ming Tang
Associate Professor
Department of Materials Science and NanoEngineering
Rice University, U.S.

Date: July 28, 2021
Time: 1000h ET
Sponsor: Hiden Analytical

During battery (dis)charging, lithium (de)intercalation in electrodes is usually spatially non-uniform across multiple length scales. Such a phenomenon is a major impediment to battery performance and life as it causes energy under-utilization and induces over-(dis)charging, etc. While reaction heterogeneity is often attributed to mass transport limitation, this talk highlights the important roles of thermodynamic factors including elastic energy and phase transformations, the understanding of which is important for the development of mitigation strategies. Through combined modeling and characterization, how stress could destabilize the lithium (de)lithiation front in single crystalline and polycrystalline intercalation compounds is elucidated. Also, a fundamental driving force for dendrite growth on the lithium metal anode during electrodeposition is provided. Stress relief thus offers a promising approach to improving reaction uniformity at the particle level. At the cell level, the reaction distribution that within the porous electrode is strongly influenced by how the electrode’s equilibrium potential varies with the state of charge, is discovered. Two types of prototypical reaction behavior emerge from common electrode materials with significant impact on the thick electrode performance. This finding leads to an efficient analytical model for optimizing battery configurations in place of common battery cell simulations. (more…)