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ACS Appl Mater Interfaces. 2016 Sep 14;8(36):23793-800. doi: 10.1021/acsami.6b05366. Epub 2016 Aug 29.

Toward High-Performance Hematite Nanotube Photoanodes: Charge-Transfer Engineering at Heterointerfaces.

Author information

1
Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-742, Korea.
2
Department of Materials Science Engineering, Korea University , Seoul 136-713, Korea.
3
Electronic Materials Research Center, Korea Institute of Science and Technology , Seoul 136-791, Korea.

Abstract

Vertically ordered hematite nanotubes are considered to be promising photoactive materials for high-performance water-splitting photoanodes. However, the synthesis of hematite nanotubes directly on conducting substrates such as fluorine-doped tin oxide (FTO)/glass is difficult to be achieved because of the poor adhesion between hematite nanotubes and FTO/glass. Here, we report the synthesis of hematite nanotubes directly on FTO/glass substrate and high-performance photoelectrochemical properties of the nanotubes with NiFe cocatalysts. The hematite nanotubes are synthesized by a simple electrochemical anodization method. The adhesion of the hematite nanotubes to the FTO/glass substrate is drastically improved by dipping them in nonpolar cyclohexane prior to postannealing. Bare hematite nanotubes show a photocurrent density of 1.3 mA/cm(2) at 1.23 V vs a reversible hydrogen electrode, while hematite nanotubes with electrodeposited NiFe cocatalysts exhibit 2.1 mA/cm(2) at 1.23 V which is the highest photocurrent density reported for hematite nanotubes-based photoanodes for solar water splitting. Our work provides an efficient platform to obtain high-performance water-splitting photoanodes utilizing earth-abundant hematite and noble-metal-free cocatalysts.

KEYWORDS:

NiFe cocatalysts; earth abundant; hematite; nanotube; water-splitting photoanode

PMID:
27551887
DOI:
10.1021/acsami.6b05366

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