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SUMMARY:Modifications of TiO2 Nanotube Arrays for Photoelectrochemical Wat
 er Splitting under Solar Light
DTSTART:20180604T101500
DTEND:20180604T111500
DTSTAMP:20260916T070244Z
UID:30a957bd3fdafe82ccc479dee0b4574cedab102217131aa3dc030d22
CATEGORIES:Conferences - Seminars
DESCRIPTION:Eun Heui Gwag\n\nThe Graduate School of EEWS\, Korea Advanced 
 Institute of Science and Technology\,  291 Daehak-ro\, Daejeon\, Republic
  of Korea 34141\nThe photoelectrochemical (PEC) water splitting with TiO2 
 as photoanode have been largely studied to using solar energy as a source.
  However\, TiO2 have significant challenges\; relatively large band gap\, 
 fast recombination speed of photo-generated electron and hole. We then tri
 ed two modifications to absorb visible light and suppress recombination. O
 ne is using localized surface plasmonic resonance (LSPR) with Au nanoparti
 cles onto TiO2 nanotube. We varied the size of Au nanoparticle\, which is 
 crucial factor for LSPR and PEC performance. Through conductive AFM measur
 ement\, we found that Schottky barrier height is decreased with smaller Au
  nanoparticle because of the stronger local electric field at the interfac
 e of Au and TiO2 and larger number of activated electrons around the Fermi
  level. Therefore\, smaller Au nanoparticles shown higher IPCE performance
  both under ultraviolet and visible light\, as photoinduced electrons can 
 easily overcome the Schottky barrier and transfer to the conduction band o
 f TiO2 via interband transition and LSPR transition\, as well as tunneling
  effect. The other is carbon doping to introduce defect level in TiO2 band
 s and to form oxygen vacancies\, which act as temporal trap sites for phot
 oinduced holes\, thus suppress recombination of charge carriers. We compar
 ed quantitative effect of carbon dopant on PEC system\, and the number of 
 available charge carriers is corresponded to the amount of carbon dopant. 
 This is well agreed with more efficient photocatalytic activity. Finally\,
  Au nanoparticles deposition and carbon doping onto TiO2 nanotube surface 
 allow charge carriers longer life time with enhanced PEC performance under
  solar light\, include visible light.\n 
LOCATION:I17 4 K2 https://plan.epfl.ch/?room==I17%204%20K2
STATUS:CONFIRMED
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