Physical and photoelectrochemical properties of Zr-doped hematite nanorod arrays

Shaohua Shen, Penghui Guo, Damon A. Wheeler, Jiangang Jiang, Sarah A. Lindley, Coleman X. Kronawitter, Jin Z. Zhang, Liejin Guo, Samuel S. Mao

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

This work examines the effect of Zr4+ ions on the physical and photoelectrochemical (PEC) properties of hematite (α-Fe2O 3) nanorod arrays grown in an aqueous solution containing zirconyl nitrate (ZrO(NO3)2) as a dopant precursor. The concentration of ZrO(NO3)2 in the precursor solution influenced both the film thickness and the Zr4+ concentration in the resulting films. Zr doping was found to enhance the photocurrent for water splitting; the highest photocurrent at 1.0 V vs. Ag/AgCl (0.33 mA cm -2) for the Zr-doped α-Fe2O3 film was approximately 7.2 times higher than that for the undoped film (0.045 mA cm -2). Additionally, the incident photon to current efficiency (IPCE) at 360 nm and 1.23 V vs. the reversible hydrogen electrode (RHE) increased from 3.8% to 13.6%. Ultrafast transient absorption spectroscopy suggests that Zr doping may influence PEC performance by reducing the rate of electron-hole recombination.

Original languageBritish English
Pages (from-to)9867-9874
Number of pages8
JournalNanoscale
Volume5
Issue number20
DOIs
StatePublished - 21 Oct 2013

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