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SUMMARY:Controlling Metal Nanoparticle Exsolution on Oxides By External Dr
 ivers – Defects\, Elastic Strain and Ion Irradiation - Professor Bilge Y
 ildiz\, Massachusetts Institute of Technology\, Cambridge\, USA.
DTSTART:20240125T160000Z
DTEND:20240125T170000Z
UID:TALK211003@talks.cam.ac.uk
CONTACT:Julie Smith
DESCRIPTION:Exsolution is an effective approach to fabricating oxide-suppo
 rted metal nanoparticle (electro-)catalysts via phase precipitation out of
  a host oxide. A fundamental understanding and control of the exsolution k
 inetics are needed to engineer the size\, density and composition of exsol
 ved nanoparticles to obtain higher catalytic activity toward clean energy 
 and fuel conversion reactions\, such as in solid oxide fuel and electrolys
 is cells. Since oxygen release via oxygen vacancy formation in the host ox
 ide is behind oxide reduction and metal exsolution\, we hypothesize that t
 he kinetics of metal exsolution should depend on the kinetics of oxygen re
 lease. In this work\, we probe the surface exsolution kinetics both experi
 mentally and theoretically using thin-film perovskite oxide model systems\
 , show its relation to the oxygen evolution kinetics\, and tune it by exte
 rnal drivers including elastic strain and ion irradiation. Using both driv
 ers\, we couple to the formation of point defects and defect clusters\, th
 at serve as nucleation sites for nanoparticle exsolution. As a result\, we
  can controllably tune size\, density\, composition and position of the ex
 solved metal nanoparticles. This finding can guide the design of exsolutio
 n electrocatalysts to advance the performance and durability of solid oxid
 e electrochemical cells.\n\nBio\nProfessor Yildiz received a BS in nuclear
  engineering from Hacettepe University in Ankara\, Turkey\, in 1999 and a 
 PhD in nuclear science and engineering from MIT in 2003. She stayed at MIT
  to do postdoctoral research in electrochemistry and then moved to Argonne
  National Laboratory to investigate structure and chemistry of energy conv
 ersion materials. She returned to MIT to join the faculty of the Departmen
 t of Nuclear Science and Materials Science in 2007. Professor Bilge Yildiz
 ’s research focuses on laying the scientific groundwork to enable next-g
 eneration electrochemical devices for energy conversion and information pr
 ocessing\, guiding the design of novel materials for applications such as 
 brain-inspired energy-efficient computing\, fuel cells\, electrolytic wate
 r splitting\, and solid-state batteries. Professor Yildiz’s approach com
 bines computational and experimental analyses.\n
LOCATION:Goldsmiths 1 &amp\; https://zoom.us/j/96836714124
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