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Validation of a two-dimensional model for vanadium redox-flow batteries
Redox-Flow batteries can play a crucial role in the future electricity supply in order to balance the time lag between the generation of electrical energy from photovoltaics or wind power and the demand for electrical energy. However, to deploy the technology on a large scale, significant cost reductions are required. A thorough knowledge of the reactions and processes taking place within a redox-flow battery is very helpful for this task and this knowledge can be significantly improved by using a suitable mathematical model to describe the processes in a single cell of a redox-flow battery. Nevertheless, this requires a valid model that has been compared with experimental data and that can ...
Experimental and model-based investigation of overpotentials during oxygen reduction reaction in silver-based gas-diffusion electrodes
Chlorine is one of the most important basic chemicals, which is used directly or indirectly in the production of around 60 % of all chemical products. The production is almost exclusively based on energy intensive electrolysis processes, with an average of 2.5 – 3.5 MWh of electrical energy required per ton of chlorine generated. This means that chlorine production alone accounts for around 3 % of the electrical energy used worldwide in industry. By using oxygen depolarized cathodes (ODC), it is possible to reduce the demand for electrical energy on an industrial scale by about 25 %. Instead of hydrogen evolution, oxygen reduction takes place. Due to the low solubility of oxygen, the elect...
Catalogue
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The Badger
UW Archives holds up to three copies of each volume of the yearbook from its initial publication in 1884 to its final publication in 2014 (129 volumes). The publication of the yearbook did not become annual until 1887, as such there are no yearbooks for 1885 or 1886. The only other interruption in yearbooks was for the years 1973 and 1974. There are still yearbooks from these years, but they were published by the Wisconsin Alumni Association rather than the student body, as such they are spare, consisting mostly of portraits of students. UW Archives currently holds at least one copy of every published volume. The 1st copy of each volume is held onsite at UW Archives while the second and third copies, where they exist, are held offsite.
Modellierung der Crossover-Prozesse und Entwicklung von Kapazitatsausgleichsstrategien zur Betriebsoptimierung von Vanadium-Redox-Flow-Batterien
Die Vanadium-Redox-Flow-Batterie ist ein Energiespeichersystem, das eine wichtige Komponente im Rahmen der Energiewende sein kann. Durch ihren Aufbau weist diese Batterie Vorteile als stationärer Speicher gegenüber anderen Speichertechnologien auf. So sind Leistung und Kapazität unabhängig voneinander skalierbar, und im Standby-Betrieb findet lediglich eine geringe Selbstentladung statt. Im Betrieb kommt es jedoch durch eine Kreuzkontamination von Vanadium-Ionen durch die Membran zu Verlusten. Dieser als Crossover bezeichnete Prozess führt zur kontinuierlichen Abnahme der Batteriekapazität. Als Transportmechanismen wirken Diffusion, Migration und Konvektion. Um den Crossover-Prozess zu...
A Conspiracy of Faith
INSPIRATION FOR THE NETFLIX SERIES DEPT. Q Detective Carl Mørck and his colleagues Assad and Rose must use all of their resources to uncover the horrifying truth in this heart-pounding Nordic thriller from the #1 international bestselling author Jussi Adler-Olsen. Carl Mørck holds in his hands a bottle that contains old and decayed message, written in blood. It is a cry for help from two young brothers, tied and bound in a boathouse by the sea. Could it be real? Who are these boys, and why weren’t they reported missing? Could they possibly still be alive? Carl’s investigation will force him to cross paths with a woman stuck in a desperate marriage—her husband refuses to tell her where he goes, what he does, how long he will be away. For days on end she waits, and when he returns she must endure his wants, his moods, his threats. But enough is enough. She will find out the truth, no matter the cost to her husband—or to herself...
