Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 15, Pages 4150-4155Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201611330
Keywords
depletion region; Fe2O3 nanotubes; high-temperature calcination; water oxidation; zirconium doping
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Funding
- National Key Research and Development Program of China [2016YFB0600901]
- National Science Foundation of China [21525626, U1463205, U1662111]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130032120018]
- Program of Introducing Talents of Discipline to Universities [B06006]
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Nanotubular Fe2O3 is a promising photoanode material, and producing morphologies that withstand high-temperatur e calcination (HTC) is urgently needed to enhance the photoelectrochemical (PEC) performance. This work describes the design and fabrication of Fe2O3 nanotube arrays that survive HTC for the first time. By introducing a ZrO2 shell on hydrothermal FeOOH nanorods by atomic layer deposition, subsequent high-temperature solid-state reaction converts FeOOH-ZrO2 nanorods to ZrO2-induced Fe2O3 nanotubes (Zr-Fe2O3 NTs). The structural evolution of the hematite nanotubes is systematically explored. As a result of the nanostructuring and shortened charge collection distance, the nanotube photoanode shows a greatly improved PEC water oxidation activity, exhibiting a photocurrent density of 1.5 mA cm(-2) at 1.23V (vs. reversible hydrogen electrode, RHE), which is the highest among hematite nanotube photoanodes without co-catalysts. Furthermore, a Co-Pi decorated Zr-Fe2O3 NT photoanode reveals an enhanced onset potential of 0.65 V (vs. RHE) and a photocurrent of 1.87 mA cm(-2) (at 1.23 V vs. RHE).
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