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SUMMARY:Recent Progress on Ternary Metal Oxide Photoelectrodes for Water S
 plitting
DTSTART:20171109T103000
DTEND:20171109T113000
DTSTAMP:20260511T050436Z
UID:e03acd0f4ef3b4231acc6c443314f6b866777d725b4b937ac28e456a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Roel van de Krol\n\nHelmholtz-Zentrum Berlin für Materialien 
 und Energie\n \nThe direct photo-electrochemical conversion of water and 
 CO2  into chemical fuels represents an exciting new pathway for the combi
 ned conversion and  storage of solar energy. One of the main challenges i
 n this field is to find semiconducting light absorbers that are efficient\
 , chemically stable\, and easy to synthesize. I will show some recent prog
 ress on BiVO4 \, a promising photoanode material with a bandgap of 2.4 eV.
 \n\nWe have investigated the carrier dynamics of undoped and doped BiVO4 
  with ultrafast timeresolved spectroscopy\, and found that carrier trappin
 g at defects and the formation of polarons play an important role. Hydroge
 n was found to be a particularly effective dopant\, since it simultaneousl
 y passivates bulk defect states and increases the dark conductivity [1]. A
  second ‘trick’ to improve the performance of BiVO4  is by functional
 izing its surface with cobalt phosphate (CoPi ).\n\nWe recently showed tha
 t the main role of this ‘catalyst’ is not to enhance the charge transf
 er kinetics\, but to passivate surface defects on BiVO4  [2]. Using ambie
 nt pressure photoemission techniques\, we now have some first clues about 
 the chemical nature of these surface states and a better insight in how th
 e solid/liquid interface behaves under illumination.\n\nThese initial resu
 lts are the first steps towards a molecular-level understanding of the BiV
 O4 /electrolyte interface that may eventually help to design efficient sol
 ar fuel generators. Scale-up is the next step\, and I will show recent res
 ults on 50 cm2  complete water splitting devices based on BiVO4  photoel
 ectrodes that we developed within the EU project PECDEMO.\n\nFinally\, if 
 time permits\, I will show some of our efforts on CuBi2 O4 \, a promising 
 new photocathode material with a bandgap of about 1.7 eV [3].\n 
LOCATION:I17 4 K2 https://plan.epfl.ch/?room==I17%204%20K2
STATUS:CONFIRMED
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