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SUMMARY:Towards Artificial Photosynthesis: Molecular and Materials Design 
 for Water Oxidation
DTSTART:20161117T160000
DTEND:20161117T170000
DTSTAMP:20260916T050044Z
UID:dd8bd501420a1de8ec0be40d68d8e6e5eeb9dcecef8bfa86f5263967
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Greta Patzke\nDepartment of Chemistry\, Uni. Zurich\, Sw
 itzerland\n \nArtificial photosynthesis has been in the focus of worldwid
 e clean energy research for decades\, because it provides direct access to
  hydrogen through solar-light water splitting. However\, the development o
 f efficient water oxidation catalysts remains a major bottleneck to master
  this demanding half reaction of water splitting on the way to technologic
 al implementations [1].\nThe talk will start with a basic overview of the 
 current challenges of water oxidation catalyst (WOC) design together with 
 an introduction to the UZH Research Priority Program LightChEC (Light to C
 hemical Energy Conversion).\nIn the first part\, our bio-inspired strategi
 es to molecular WOCs along the lines of Nature's {CaMn4O2} oxygen evolving
  complex (OEC) will be presented. We aim to translate OEC features into ef
 ficient Co-based WOCs\, which led to the development of the first cuboidal
  {Co(II)4O4} WOC with a flexible ligand environment.[2] The key functional
  elements of this Co-cubane WOC will be compared to the first series of hi
 ghly sought-after active cubane WOCs combining mobile ligands with a bio-m
 imetic redox-inert center\, namely the [Coll3Ln(hmp)4(OAc)5H2O] (Ln = Ho -
  Yb\, hmp = 2-(hydroxymethyl)pyridine) cubanes.[3] Crucial issues in molec
 ular catalyst construction will be discussed\, including core nuclearity\,
  ligand architecture/exchange and the role of Ln3 cations as Ca2+ mimics.\
 nThe second part of the talk will complement molecular catalysis with our 
 recent strategies towards heterogeneous Co-containing WOCs\, such as robus
 t spinel- and perovskite-based systems. Special emphasis will be placed on
  La1-xSrxBO3 perovskites (B = Fe\, Co\, Ni or Mn) as model systems for ele
 ctronic structure tuning as a straightforward strategy toward solid WOC op
 timization.[4] An outlook on unified WOC design approaches will be round o
 ff the talk.\n[1] M. D. Karkas\, O. Verho\, E. V. Johnston\, B. Akermark\,
  Chem. Rev. 2014\, 114\, 11863.\n[2] F. Evangelisti\, R. Güttinger\, R. M
 oré\, S. Luber\, G. R. Patzke*\, J. Am. Chem. Soc. 2013\, 135\, 18734. \
 n[3] F. Evangelisti\, R. Moré\, F. Hodel\, S. Luber*\, G. R. Patzke*\, J.
  Am. Chem. Soc. 2015\, 137\, 11076.\n[4] H. Liu\, R. Moré\, H. Grundmann\
 , C. Cui\, R. Erni\, G. R. Patzke\, J. Am. Chem. Soc. 2016\, 138\, 1527.\n
  
LOCATION:Zeuzier https://www.google.com/maps/place/EPFL+Valais+Wallis/?ref
 =zeuzier
STATUS:CONFIRMED
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