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  4. Controlling photo-activity of solution-processed hematite electrodes for solar water splitting
 
conference paper

Controlling photo-activity of solution-processed hematite electrodes for solar water splitting

Sivula, Kevin  
•
Brillet, Jeremie  
•
Graetzel, Michael  
2010
Solar Hydrogen And Nanotechnology V
Conference on Solar Hydrogen and Nanotechnology V

Hematite is a promising material for solar energy conversion via photo-electrochemical water splitting. However, the precise control of substitutional doping and nanometer feature size is important for high photon harvesting efficiency. Doped and nanostructured hematite electrodes can be prepared by a simple solution-based colloidal approach however, a high temperature (800 degrees C) annealing is required to activate the dopant atoms. This high temperature annealing step also increases the particle size above the dimension necessary for high photon harvesting efficiencies. Here we investigate a strategy to control the two kinetic processes occurring during sintering (particle size increase and dopant diffusion/activation) by incorporating Ti dopant directly into the colloid solution and reducing the annealing time. We find that this strategy leads to porous, high-surface area hematite electrodes giving a solar photocurrent density of 1.1 mA cm(-2) at 1.23 V vs. the reversible hydrogen electrode (RHE) under standard testing conditions where only 0.56 mA cm(-2) was observed at 1.23 V vs. RHE with our previous work. In addition, scanning electron micrographs examining the morphology of the electrodes suggests that our kinetic strategy is indeed effective and that further optimization may result in higher photocurrents.

  • Details
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Type
conference paper
DOI
10.1117/12.860199
Web of Science ID

WOS:000286094200007

Author(s)
Sivula, Kevin  
Brillet, Jeremie  
Graetzel, Michael  
Date Issued

2010

Publisher

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa

Published in
Solar Hydrogen And Nanotechnology V
ISBN of the book

978-0-8194-8266-2

Series title/Series vol.

Proceedings of SPIE-The International Society for Optical Engineering; 7770

Start page

77700G

Subjects

Photo-electrochemical water splitting

•

hydrogen production

•

solar cells

•

alpha iron oxide

•

porous thin-films

•

sintering nano-particles

•

substitutional dopant activation

•

Alpha-Fe2O3

•

Photoanodes

•

Films

Editorial or Peer reviewed

NON-REVIEWED

Written at

EPFL

EPFL units
LIMNO  
LPI  
Event nameEvent placeEvent date
Conference on Solar Hydrogen and Nanotechnology V

San Diego, CA

Aug 03-05, 2010

Available on Infoscience
December 16, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/74839
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