Journal
NANOSCALE
Volume 5, Issue 20, Pages 9867-9874Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3nr03245k
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Funding
- National Natural Science Foundation of China [51102194, 51121092]
- Doctoral Program of the Ministry of Education [20110201120040]
- National Basic Research Program of China [2009CB220000]
- Fundamental Research Funds for the Central Universities
- W. M. Keck Center for Nanoscale Opto-fluidics at UC Santa Cruz
- U. S. Department of Energy, Office of Energy Efficiency and Renewable Energy
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This work examines the effect of Zr4+ ions on the physical and photoelectrochemical (PEC) properties of hematite (alpha-Fe2O3) 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 alpha-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.
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