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

Dr. Amir Khodabakhsh
November 21st 2019
11:15 to 12:15
During the past couple of decades, optical frequency comb spectroscopy has matured from theoretical calculation and limited lab demonstration to a powerful tool suitable for different practical applications. These applications are quite diverse: from environmental monitoring, study of chemical reactions, combustion analysis and plasma study to pharmaceutical and medical diagnostics. In my talk, I will present a brief introduction of optical frequency combs and their applications in molecular absorption spectroscopy and cover my personal journey during the past seven years on the development of optical frequency comb spectroscopy systems in near- and mid-infrared wavelength ranges. I mainly discuss three most popular detection methods of Fourier-transform, Vernier and dual-comb spectroscopy as well as two practical applications, combustion analysis in a flat flame burner and time-resolved spectroscopy in an electrical discharge.
Prof. Dr. Moniek Tromp
December 4th 2019
11:15 to 12:15
Attention: alternative weekday > Wednesday instead of Thursday Abstract Prof. Dr. Moniek Tromp, University of Groningen, Faculty of Science and Engineering, Zernike Institute for Advanced Materials, Materials Chemistry, Nijenborgh 4, 9747 AG Groningen, Moniek [368] Tromp [28] rug [368] nl   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 [1], 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 [1-6] and future research directions described. [1] Y. Gorlin, A. Siebel, M. Piana, T. Huthwelker, H. Jha, G. Monsch, F. Kraus, H.A. Gasteiger, M. Tromp, J. Electrochem. Soc. 162(7): A1146-A1155, 2015. [2] Y. Gorlin, M. U. M. Patel, A. Freiberg, Q. He, M. Piana, M. Tromp, H. A. Gasteiger, J. Electrochem. Soc. 2016, 163(6), A930-A939. [3] J. Wandt, A. Freiberg, R. Thomas, Y. Gorlin, A. Siebel, R. Jung, H. A. Gasteiger, M. Tromp, J. Mater. Chem. A 2016, 4, 18300-18305. [4] A. T. S. Freiberg, A. Siebel, A. Berger, S. M. Webb, Y. Gorlin, H. A. Gasteiger, M. Tromp, J. Phys. Chem. C 2018, 122, 10, 5303-5316. [5] A. Berger, A. T. S. Freiberg, R. J. Thomas, M. U. M. Patel, M. Tromp, H. Gasteiger, Y. Gorlin, J. Electrochem. Soc. 2018, 165(7), A1288-A1296. [6] R. Jung, F. Linsenmann, R. J. Thomas, J. Wandt, S. Solchenbach, F. Maglia, C. Stinner, H. A. Gasteiger, M. Tromp, J. Electrochem. Soc. 2019, 166(2): A378-A389.
Dr. ir. Eefje Cuppen
December 12th 2019
11:15 to 12:15
- abstract pending -
Prof. dr. ir. Wiebren de Jong
December 19th 2019
11:15 to 12:15
- abstract pending -