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SUMMARY:Insights into Perovskite Nano-Catalysts as Oxygen Electrodes for t
 he Electrochemical Splitting of Water
DTSTART:20180226T131500
DTEND:20180226T141500
DTSTAMP:20260430T185449Z
UID:98d46625af5063809afeacecce3243f3578298a42a181ca6645c19b2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Emiliana Fabbri\, Paul Scherrer Institut\, Villigen Switzer
 land\nIn recent years\, electricity-driven hydrogen production by electroc
 hemical splitting of water has received particular attention because of it
 s potential applicability in decentralized energy storage concepts.(1)  M
 ost of the efforts have been focused on the electrochemical reaction occur
 ring at the anode side\, the oxygen evolution reaction (OER)\, since it is
  source of large overpotentials.(2)\n\nAdvances in computational studies a
 nd in in situ characterizations can now offer novel insights into the OER 
 mechanism\, revealing new perspective in the search for advanced materials
 . However\, at present most of the fundamental studies on OER catalysts ha
 ve been conducted using bulk techniques and materials with low surface are
 a\, which is a questionable approach considering that the OER is a near-su
 rface reaction. In this study\,(3) we couple a cutting-edge synthesis meth
 od to produce highly active OER nano-catalysts with time resolved X-ray ab
 sorption spectroscopy (XAS) measurements able to capture dynamics of the c
 atalyst electronic and local structure during operando conditions. The use
  of nano-catalysts not only allows achieving outstanding performance\, but
  also reveals electronic and structural changes at the catalysts surface (
 given the high surface to bulk ratio of nanoparticles) never observed befo
 re. Particularly\, we could demonstrate that the key for highly active cat
 alysts is a self-assembled\, (oxy)hydroxide top layer. This is completely 
 different from the message of several water electrolysis-related publicati
 ons\, which consider the surface of oxide catalysts as an ideal\, atomical
 ly flat surface. This new concept completely revolutionizes the currently 
 most accepted view of design principles for highly active perovskite catal
 ysts. It also points towards the paramount necessity of investigating othe
 r perovskite properties under operando conditions in order to develop accu
 rate design principles for highly active perovskite catalysts.(4)\n \n \
 n 1.       Fabbri E\, Habereder A\, Waltar K\, Kotz R\, Schmidt TJ.
 \, Catal Sci Technol 2014\, 4: 3800-3821.\n2.        Fabbri E\, Nac
 htegaal M\, Cheng X\, Schmidt TJ\, Advanced Energy Materials 2015\, 5(17) 
 1402033.\n3.       Fabbri E\, Nachtegaal M\, Cheng X\, Binninger T\,
  Durst J\, Bozza F\, et al.\, Nature Materials 2017\, 16: 925–931\n4.  
     Fabbri E\, Abbott DF\, Nachtegaal M\, Schmidt TJ\, Current Opinion
  in Electrochemistry 2017\, https://doi.org/10.1016/j.coelec.2017.08.009\n
 \nBio: Emiliana Fabbri received her PhD in Materials Science from the Univ
 ersity of Rome Tor Vergata\, Italy on December 2008. A significant part of
  her PhD studies were carried out at the University of Florida\, Gainesvil
 le USA. In 2009 she was appointed as tenure scientist at the International
  Center for Material Nanoarchitectonics (MANA) at the National Institute f
 or Materials Science (NIMS)\, Japan. Emiliana Fabbri deeply investigated p
 roton and oxygen-ion conduction mechanism in bulk oxides and electrochemic
 al reaction mechanisms\, particularly related to solid oxide fuel cells. 
  Since January 2012\, Emiliana Fabbri joined the Paul Scherrer Institute 
 in Switzerland as senior scientist working on materials for electrochemica
 l energy storage and conversion\, with emphasis on metal oxides. To gain a
  fundamental understanding of electrochemical reaction mechanisms and cat
 alytic activity descriptors\, she is particularly interested in the cataly
 st surface chemistry and electronic structure investigated by operando X-r
 ay photoelectron spectroscopy and X-ray absorption spectroscopy\, respecti
 vely.\n \n \n\n 
LOCATION:MXF 1 https://plan.epfl.ch/?room==MXF%201
STATUS:CONFIRMED
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