title: Toward High-Performance Hematite Nanotube Photoanodes: Charge-Transfer Engineering at Heterointerfaces.
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.
authors.affiliation: Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-742, Korea.|Department of Materials Science Engineering, Korea University , Seoul 136-713, Korea.
authors.forename: Do Hong
authors.initials: do H
authors.lastname: Kim
authors.affiliation: Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-742, Korea.
authors.forename: Dinsefa M
authors.initials: DM
authors.lastname: Andoshe
authors.affiliation: Electronic Materials Research Center, Korea Institute of Science and Technology , Seoul 136-791, Korea.
authors.forename: Young-Seok
authors.initials: YS
authors.lastname: Shim
authors.affiliation: Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-742, Korea.
authors.forename: Cheon-Woo
authors.initials: CW
authors.lastname: Moon
authors.affiliation: Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-742, Korea.
authors.forename: Woonbae
authors.initials: W
authors.lastname: Sohn
authors.affiliation: Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-742, Korea.
authors.forename: Seokhoon
authors.initials: S
authors.lastname: Choi
authors.affiliation: Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-742, Korea.
authors.forename: Taemin Ludvic
authors.initials: TL
authors.lastname: Kim
authors.affiliation: Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-742, Korea.
authors.forename: Migyoung
authors.initials: M
authors.lastname: Lee
authors.affiliation: Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-742, Korea.
authors.forename: Hoonkee
authors.initials: H
authors.lastname: Park
authors.affiliation: Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-742, Korea.
authors.forename: Kootak
authors.initials: K
authors.lastname: Hong
authors.affiliation: Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-742, Korea.
authors.forename: Ki Chang
authors.initials: KC
authors.lastname: Kwon
authors.affiliation: Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-742, Korea.
authors.forename: Jun Min
authors.initials: JM
authors.lastname: Suh
authors.affiliation: Electronic Materials Research Center, Korea Institute of Science and Technology , Seoul 136-791, Korea.
authors.forename: Jin-Sang
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Department of Materials Science Engineering, Korea University , Seoul 136-713, Korea.
authors.forename: Jong-Heun
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Materials Science Engineering, Research Institute of Advanced Materials, Seoul National University , Seoul 151-742, Korea.
authors.forename: Ho Won
authors.initials: HW
authors.lastname: Jang
keywords: NiFe cocatalysts; earth abundant; hematite; nanotube; water-splitting photoanode