Journal
ACS NANO
Volume 7, Issue 3, Pages 2396-2405Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn305639z
Keywords
hematite; Fe2O3; photoelectrocatalysis; water oxidation; electrochemical impedance spectroscopy; X-ray absorption spectroscopy; XANES
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Funding
- ANSER Center, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001059]
- UChicago Argonne, LLC [DE-AC02-06CH11357]
- National Science Foundation [CHE-1150378]
- U.S. Department of Energy, BES Materials Sciences [DE-AC-02-06CH11357]
- UChicago Argonne, LLC
- U.S. DOE [DE-AC02-06CH11357]
- MURI grant from the Air Force Office of Sponsored Research [FA9550-08-0309]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1150378] Funding Source: National Science Foundation
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Hematite photoanodes were coated with an ultrathin cobalt oxide layer by atomic layer deposition (AID). The optimal coating-1 ALD cycle, which amounts to <1 monolayer of Co(OH)(2)/Co3O4-resulted in significantly enhanced photoelectrochemical water oxidation performance. A stable, 100-200 mV cathodic shift In the photocurrent onset potential was observed that is correlated to an order of magnitude reduction in the resistance to charge transfer at the Fe2O3/H2O Interface. Furthermore, the optical transparency of the ultrathin Co(OH)(2)/Co3O4 coating establishes it as a particularly advantageous treatment for nanostructured water oxidation photoanodes. The photocurrent of catalyst-coated nanostructured inverse opal scaffold hematite photoanodes reached 0.81 and 2.1 mA/cm(2) at 1.23 and 1.53 V, respectively.
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