Single-crystalline, wormlike hematite photoanodes for efficient solar water splitting
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- Single-crystalline, wormlike hematite photoanodes for efficient solar water splitting
- Kim, Jae Young; Magesh, Ganesan; Youn, Duck Hyun; Jang, Ji-Wook; Kubota, Jun; Domen, Kazunari; Lee, Jae Sung
- PHOTOELECTROCHEMICAL HYDROGEN GENERATION; OXYGEN-EVOLVING CATALYST; IRON-OXIDE; VISIBLE-LIGHT; THIN-FILMS; ARTIFICIAL PHOTOSYNTHESIS; OXIDATION ACTIVITY; CARBON NANOTUBES; CHARGE-TRANSFER; ALPHA-FE2O3
- Issue Date
- NATURE PUBLISHING GROUP
- SCIENTIFIC REPORTS, v.3, no., pp.2681 -
- A hematite photoanode showing a stable, record-breaking performance of 4.32 mA/cm(2) photoelectrochemical water oxidation current at 1.23 V vs. RHE under simulated 1-sun (100 mW/cm(2)) 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 degrees C and 800 degrees C of beta-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.
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