BEGIN:VCALENDAR
VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
X-WR-CALNAME:CBE Seminar: Sossina Haile
X-WR-TIMEZONE:Eastern Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260910T075713Z
UID:tag:localist.com\,2008:EventInstance_45923044045238
DTSTART:20240416T200000Z
DTEND:20240416T210000Z
DESCRIPTION:Superprotonic Solid Acid Compounds for Sustainable Energy Techn
 ologies\n\nAbstract:\n\nSuperprotonic solid acid electrolytes\, materials 
 with chemical and physical properties intermediate between conventional ac
 ids (e.g.\, H3PO4) and conventional salts (e.g.\, Cs3PO4)\, have emerged a
 s attractive candidates for fuel cell and other electrochemical applicatio
 ns. Key characteristics of these materials\, which include CsHSO4\, Cs3H(S
 eO4)2\, CsH2PO4\, and Cs2(HSO4)(H2PO4)\, are tetrahedral oxyanion groups l
 inked by hydrogen bonds and a polymorphic structural transition to a disor
 dered state at moderate temperatures. In the high temperature state\, rapi
 d oxyanion reorientation and dynamic disorder of the hydrogen bond network
  facilitate high proton conductivity. The transition to the structurally d
 isordered phase is accompanied by a jump in conductivity by 3–5 orders o
 f magnitude\, and the activation energy for proton transport drops to a va
 lue of ~ 0.35 eV. Of materials displaying such behavior\, CsH2PO4 is of pa
 rticular technological significance due to its chemical stability against 
 both oxidation and reduction in device-relevant environments. We present h
 ere an overview of the proton transport characteristics of CsH2PO4 and the
  current status of electrochemical technologies in which it has been deplo
 yed. Material limitations translate into device limitations\, motivating o
 ur efforts to develop and discover new superprotonic conductors. We show t
 hat dramatic changes in phase behavior and proton conductivity of the base
  phosphate can be induced by only minor changes in chemistry\, suggesting 
 routes for tuning behavior to achieve desired outcomes.\n\nBiography:\n\nS
 ossina M. Haile\,Walter P. Murphy Professor of Materials Science and Engin
 eering at Northwestern University\, assumed her current position in 2015 a
 fter serving 18 years on the faculty at the California Institute of Techno
 logy. She earned her PhD in materials science and engineering from the Mas
 sachusetts Institute of Technology in 1992. Haile’s research broadly enc
 ompasses materials\, especially oxides\, for sustainable electrochemical e
 nergy technologies. Amongst her many awards\, in 2008 Haile received an Am
 erican Competitiveness and Innovation Fellowship from the US National Scie
 nce Foundation\, in 2010 the Chemical Pioneer Award of the American Instit
 ute of Chemists\, in 2012 the International Ceramics Prize of the World Ac
 ademy of Ceramics\, and in 2020 the Turnbull Award of the Materials Resear
 ch Society. She is a fellow of the Materials Research Society\, the Americ
 an Ceramics Society\, the Royal Society of Chemistry\, the African Academy
  of Sciences\, and the Ethiopian Academy of Sciences\, and serves on the e
 ditorial boards of Joule and MRS Energy and Sustainability.
GEO:35.957742;-83.924032
LOCATION:Dougherty Engineering Building\, 416
SUMMARY:CBE Seminar: Sossina Haile
URL;VALUE=URI:https://calendar.utk.edu/event/cbe-seminar-sossina-haile
CATEGORIES:Lectures & Presentations
END:VEVENT
END:VCALENDAR