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Jang, Ji-Wook
JW Energy Lab
Research Interests
  • Materials Science, Energy

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Single-crystalline, wormlike hematite photoanodes for efficient solar water splitting

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Title
Single-crystalline, wormlike hematite photoanodes for efficient solar water splitting
Author
Kim, Jae YoungMagesh, GanesanYoun, Duck HyunJang, Ji-WookKubota, JunDomen, KazunariLee, Jae Sung
Keywords
PHOTOELECTROCHEMICAL HYDROGEN GENERATION; OXYGEN-EVOLVING CATALYST; IRON-OXIDE; VISIBLE-LIGHT; THIN-FILMS; ARTIFICIAL PHOTOSYNTHESIS; OXIDATION ACTIVITY; CARBON NANOTUBES; CHARGE-TRANSFER; ALPHA-FE2O3
Issue Date
201309
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v.3, no., pp.2681 -
Abstract
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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DOI
http://dx.doi.org/10.1038/srep02681
ISSN
2045-2322
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ECHE_Journal Papers
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