Synthesis and photoelectrochemical cell properties of vertically grown α-Fe2O3 nanorod arrays on a gold nanorod substrate

Aiming Mao, Gui Young Han, Jong Hyeok Park

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Abstract

Photoelectrochemical cells prepared from highly ordered and vertically grown α-Fe2O3 nanorod arrays on a Au nanorod substrate showed about 8 mA cm-2 photocurrent density under 1 sun condition without any hole scavenger. To the best of our knowledge, it is the highest value obtained from α-Fe2O3. The Au nanorod arrays were firstly grown inside the AAO nanotubes to provide a conductive surface, not only for the electrochemical deposition of the target material, but also to act as the current collector of a photoelectrochemical cell. Then, the Fe nanorods were electrodeposited on the gold nanorods and annealed in an O 2 atmosphere to convert them into α-Fe2O3 nanorod arrays. The α-Fe2O3 nanorod arrays stood freely on the gold nanorod arrays after the removal of the AAO template. The photoelectrochemical properties of the α-Fe2O3 nanorod arrays as a photoanode were studied by evaluating their photocurrent-potential behavior in 1 M NaOH electrolyte under AM 1.5 100 mW cm-2 illumination. Also, the dependence of the photocatalytic ability of the α-Fe2O3 nanorod arrays on their length was studied and the optimum rod length was determined.

Original languageEnglish
Pages (from-to)2247-2250
Number of pages4
JournalJournal of Materials Chemistry
Volume20
Issue number11
DOIs
Publication statusPublished - 2010 Mar 9

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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