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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Charge transfer in iron oxide photoanode modified with carbon nanotubes for photoelectrochemical water oxidation: An electrochemical impedance study

Cited 19 times inthomson ciCited 18 times inthomson ci
Title
Charge transfer in iron oxide photoanode modified with carbon nanotubes for photoelectrochemical water oxidation: An electrochemical impedance study
Other Titles
Charge transfer in iron oxide photoanode modified with carbon nanotubes for photoelectrochemical water oxidation: An electrochemical impedance study
Author
Kim, Jae YoungJun, HwichanHong, Suk JoonKim, Hyun GyuLee, Jae Sung
Keywords
Photoelectrochemical water oxidation; Charge transfer; Iron oxide; Carbon nanotube; Electrochemical impedance spectroscopy
Issue Date
2011-08
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.36, no.16, pp.9462 - 9468
Abstract
Iron oxide photoanode was modified with multi-wall carbon nanotubes (MWCNTs) to improve the charge transport property of iron oxide in the photoelectrochemical water oxidation under solar light. The MWCNT-modified Fe(2)O(3) electrode exhibited markedly increased photocurrent generation (by 66%) relative to unmodified Fe(2)O(3) electrode. Electrochemical impedance spectroscopy demonstrated that MWCNT modification dramatically decreased resistance over the entire electrode and increased capacitance at the interface between carbon nanotubes and conducting substrate. The Mott-Schottky analysis showed that the flat band potential of the Fe(2)O(3) electrode shifted to a more positive potential in the MWCNT-modified anode, indicating the charge migration from Fe(2)O(3) to MWCNT. Thus the role of the MWCNT as an expressway for electron transport has been clearly demonstrated, which would help charge separation and improve photoelectrochemical water oxidation efficiency of the poorly conducting Fe(2)O(3) electrode. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved
URI
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DOI
10.1016/j.ijhydene.2011.05.046
ISSN
0360-3199
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ECHE_Journal Papers
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