Electrodeposition of α-Fe2O3 doped with Mo or Cr as photoanodes for photocatalytic water splitting

Kleiman-Shwarsctein, Alan, Hu, Yong-Sheng, Forman, Arnold J., Stucky, Galen D. and McFarland, Eric W. (2008) Electrodeposition of α-Fe2O3 doped with Mo or Cr as photoanodes for photocatalytic water splitting. Journal of Physical Chemistry C, 112 40: 15900-15907. doi:10.1021/jp803775j

Author Kleiman-Shwarsctein, Alan
Hu, Yong-Sheng
Forman, Arnold J.
Stucky, Galen D.
McFarland, Eric W.
Title Electrodeposition of α-Fe2O3 doped with Mo or Cr as photoanodes for photocatalytic water splitting
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7447
Publication date 2008-10-09
Sub-type Article (original research)
DOI 10.1021/jp803775j
Open Access Status Not yet assessed
Volume 112
Issue 40
Start page 15900
End page 15907
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Subject 1606 Political Science
2504 Electronic, Optical and Magnetic Materials
2508 Surfaces, Coatings and Films
2100 Energy
Abstract Electrochemical methods for the codeposition of Cr or Mo with α-Fe2O3 (hematite) have been developed to produce doped iron oxide films with varying compositions of Cr and Mo which are active photoanodes for photoelectrochemical (PEC) water decomposition ("water splitting"). The films were characterized by scanning electron microscopy, X-ray diffraction, UV - vis optical spectroscopy, and X-ray photoelectron spectroscopy to determine the effect of the dopants on the hematite structure and PEC performance. Upon doping, the microstructures of the films varied; however, no preferred crystallographic orientation or dopant phase segregation was observed. The best performing samples were 5% Cr and 15% Mo doped which had Incident Photon Conversion Efficiencies (IPCE's) at 400 nm of 6% and 12%, respectively, with an applied potential of 0.4V vs Ag/AgCl. These IPCE values were 2.2× and 4× higher than the undoped sample for the 5% Cr and 15% Mo samples, respectively. The increase in performance is attributed to an improvement in the charge transport properties within the films and not due to significant changes in the electrocatalytic rates due to dopants residing at the surface. The onset potential for photocurrent in all the samples was approximately -350 mV vs Ag/AgCl. The optical absorption spectra of the films showed bandgaps of approximately 2.0-2.1 eV for all samples regardless of doping.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
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