title: Single-crystalline, wormlike hematite photoanodes for efficient solar water splitting.
abstract: A hematite photoanode showing a stable, record-breaking performance of 4.32 mA/cm² photoelectrochemical water oxidation current at 1.23 V vs. RHE under simulated 1-sun (100 mW/cm²) irradiation is reported. This photocurrent corresponds to ca. 34% of the maximum theoretical limit expected for hematite with a band gap of 2.1 V. The photoanode produced stoichiometric hydrogen and oxygen gases in amounts close to the expected values from the photocurrent. The hematitle has a unique single-crystalline "wormlike" morphology produced by in-situ two-step annealing at 550°C and 800°C of β-FeOOH nanorods grown directly on a transparent conducting oxide glass via an all-solution method. In addition, it is modified by platinum doping to improve the charge transfer characteristics of hematite and an oxygen-evolving co-catalyst on the surface.
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Pohang 790-784, Republic of Korea.
authors.forename: Jae Young
authors.initials: JY
authors.lastname: Kim
authors.forename: Ganesan
authors.initials: G
authors.lastname: Magesh
authors.forename: Duck Hyun
authors.initials: DH
authors.lastname: Youn
authors.forename: Ji-Wook
authors.initials: JW
authors.lastname: Jang
authors.forename: Jun
authors.initials: J
authors.lastname: Kubota
authors.forename: Kazunari
authors.initials: K
authors.lastname: Domen
authors.forename: Jae Sung
authors.initials: JS
authors.lastname: Lee
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