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UID:45245651-a5bd-4b17-8165-d55292e98664@nexttoyou
DTSTAMP:20261105T160926Z
DTSTART:20261110T210000Z
DTEND:20261110T220000Z
SUMMARY:Professor Zahra Fakhraai (University of Pennsylvania) Seminar
LOCATION:Chevron Science Center 154\, 219 Parkman Avenue\, Pittsburgh\, PA
  15260
DESCRIPTION:Title: Evolution of Electrode Interfaces During Electrochemist
 ry\n\nAbstract: Photoelectrochemical reactions have emerged as a direct p
 athway to harvest solar energy for sustainable chemistry. Understanding a
 nd controlling the complex microenvironments of charged electrodes or hyb
 rid inorganic/organic interfaces is critical for optimizing a desired rea
 ction and ensuring electrode/material durability. We utilize in situ elec
 trochemical spectroscopic ellipsometry to measure the complex dielectric 
 constant and index of refraction of the electrolyte interface. Using this
  approach\, we monitor the evolution of the microenvironments of hybrid i
 nterfaces and independently measure the properties of the electric double
  layer\, polymer stability\, oxide formation and reduction\, to disentang
 le the role of various factors in reaction evolution and electrode degrad
 ation. In aqueous electrolytes\, we demonstrate that the orientation and 
 restructuring of water can play a strong role in slowing the interfacial 
 kinetics upon discharge\, and show that this is primarily due to the form
 ation of a metastable state where reorganization entropy compensates the 
 change in the doubly layer enthalpy. In non-aqueous electrolytes\, we dem
 onstrate the strong interplay between additives and electrolyte oxidation
  states in reaction selectivity\, by independently measuring the oxidatio
 n state change and the electrolyte kinetics in the absence or presence of
  surfactants. Overall\, we show that by monitoring the interfa\n\nhttp://
 next-to-u.app/events/45245651-a5bd-4b17-8165-d55292e98664
URL:http://next-to-u.app/events/45245651-a5bd-4b17-8165-d55292e98664
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