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UID:1758265200@ist.ac.at
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DESCRIPTION:Speaker: Soumyadip Mondal\nhosted by Johann Danzl\nAbstract: Ox
 ygen (O) and sulfur (S) redox reactions are at the core of energy storage 
 and biological systems. Being one of the light\, cheap\, abundant and most
  versatile redox active elements\, the O and S redox chemistry is complex\
 , and the practical realization of energy storage systems utilizing these 
 redox systems is still very far. For O redox\, the oxygen evolution from s
 uperoxide is a critical aspect\, and the factors that govern the formation
  of triplet (3O2) and harmful singlet (1O2) oxygen are unclear. My project
  on O redox began by setting up a spectroscopic tool to detect singlet oxy
 gen. Then I explored the governing factors for its formation in both aqueo
 us and non-aqueous solutions through heterogeneous electron transfer and d
 isproportionation and found out that the release of triplet or singlet oxy
 gen is governed by individual Marcus normal and inverted region behaviour.
  For S redox in non-aqueous media in the context of the Li-S battery\, the
  understanding of the intermediate sulfur reduction species\, known as pol
 ysulfides\, is incomplete. In the Li-S battery\, S8 (the most oxidized for
 m) is converted to Li2S (the most reduced form) in multiple steps\, via fi
 rst long-chain polysulfides Li2Sx (6 < x < 8)\, short-chain LiPSs (x < 6) 
 and finally solid Li2S. However\, the question of which polysulfides coexi
 st at any state-of-charge\, how they are interconverted\, and what the rat
 e and potential limiting steps are has been entirely open and equally\, th
 e solubility of shorter chain LiPSs are unknown. My PhD project on S redox
  explores accessing individual polysulfides through different ways to unde
 rstand their equilibria in the solution and solid phase and the conversion
  dynamics. The results from O and S redox afford detailed insights into ki
 netics\, thermodynamics\, and reaction mechanisms\, allowing them to be in
 fluenced in an informed way. 
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 ) and Zoom\, ISTA
ORGANIZER:
SUMMARY:Soumyadip Mondal: Thesis Defense: Oxygen and Sulfur Redox: Conversi
 on Kinetics and Phase Equilibria
URL:https://talks-calendar.ista.ac.at/events/5965
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