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SUMMARY:The artificial leaf for efficient generation of solar fuels: invol
 ved elementary steps and material's design - Prof. Wolfram Jaegermann\, TU
  Darmstadt
DTSTART:20171005T100000Z
DTEND:20171005T110000Z
UID:TALK84041@talks.cam.ac.uk
CONTACT:Sharon Connor
DESCRIPTION:For an effective conversion of solar energy to a chemical fuel
  a number of elementary processes as well as their coupling to each other 
 must be optimized without severe losses in the number and the chemical pot
 ential of the originally generated electron-hole pairs. Light absorption c
 oupled to efficient charge carrier generation and separation may be realiz
 ed by thin film semiconductor devices - preferentially using buried tandem
  or multijunction solar cells in a photoelectrochemical arrangment - which
  may provide broad band quantum efficiencies close to 1. Alternatively\, J
 anus type photocatalysts may be chosen which favour vectorial electron-hol
 e pair transport into opposite directions. Subsequently\, H2  and O2 from 
 H2O must be formed by electron and hole transfer reactions with minimized 
 loss of chemical potential. This will only be possible if the involved cha
 rge transfer steps are coupled to selective multi electron transfer cataly
 sts without loss in the chemical potential of the minority carriers and th
 eir photocurrent. Technologically feasible solutions seem to be possible f
 or water splitting and H2-generation\, as we will show with a number of in
 vestigations performed recently combining electrochemical investigations w
 ith surface science studies. \n
LOCATION:Unilever Lecture Theatre\, Unilever Centre\, Department of Chemis
 try
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