Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 134, Issue 44, Pages 18318-18324Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja3067622
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Funding
- National Science Foundation (NSF) Powering the Planet Center for Chemical Innovation (CCI-Solar) [CHE-0802907, CHE-0947829]
- U.S. Department of Energy under the Hydrogen Fuel Initiative
- U.S. Department of Energy [DE-AC02-98CH10886]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0802907] Funding Source: National Science Foundation
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We describe stable intercalation compounds of the composition xN(2)center dot WO3 (x = 0.034-0.039), formed by trapping N-2 in WO3. The incorporation of N-2 significantly reduced the absorption threshold of WO3; notably, 0.039N(2)center dot WO3 anodes exhibited photocurrent under illumination at wavelengths <= 640 nm with a faradaic efficiency for O-2 evolution in 1.0 M HClO4(aq) of nearly unity. Spectroscopic and computational results indicated that deformation of the WO3 host lattice, as well as weak electronic interactions between trapped N-2 and the WO3 matrix, contributed to the observed red shift in optical absorption. Noble-gas-intercalated WO3 materials similar to xN(2)center dot WO3 are predicted to function as photoanodes that are responsive to visible light.
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