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

Prof. dr. ir. J.M.A. (Jacquelien) Scherpen
April 16th 2020
11:15 to 12:15
Abstract: In this talk we focus on the various energy grids, their coupling, and the control of the grids while having more and more embedding of renewables, and various storage devices. The two perspectives and the integration thereof that will be treated are the physical layer  and the optimization layer of a grid, where market structures are relevant. A combination of passivity based control techniques, as well as optimization in a combined distributed and hierarchical market structure will be considered. We will focus specifically on embedding renewables through converters, DC and AC microgrids, and embedding of storage devices such as power-to-gas facilities in the various grids.
Prof. Dr. Moniek Tromp
June 11th 2020
11:15 to 12:15
An important element in the reduction of CO2 is the change of vehicles with internal combustion engines to electric battery powered vehicles. The as such produced renewable energy can be used for individual mobility as well as for a temporary intermediate storage of excess energy. A viable electric mobility concept requires however stable cycle batteries with high specific energy (minimising weight, maximising driving range). Li ion batteries are widely used in applications such as mobile phones and laptops, and will likely be key to future electromobility. An alternative promising battery is the lithium sulfur battery with a potential twofold energy density increase. The requirements for such batteries present major challenges; e.g. energy capacity, deactivation/stability and safety. A detailed understanding of the charge, discharge and deactivation mechanisms are thus required, preferably quantitative and spatially resolved. X-ray absorption spectroscopy (XAS) is a characterisation technique which provides detailed electronic and structural information on the material under investigation, in a time- and spatially resolved manner. Here, I will explain the strengths and limitations of XAS for battery research. A novel operando XAS cell design will be described, including the challenges to perform reliable experiments (electrochemically and spectroscopically). The cell allows time and spatial resolved XAS, providing insights in the type, location and reversibility of the intermediates formed in electrodes and electrolyte separately. Obtained insights in cycling and deactiviation mechanisms for the different battery types will be discussed and future research directions described.