Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 45, Pages 19247-19252Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta03676j
Keywords
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Funding
- National Science Foundation (United States) [DMR-1231586]
- Department of Energy [DE-AC02-98CH10886]
- Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy [DE-FG02-11ER16266]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1231586] Funding Source: National Science Foundation
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Photocatalytic hydrogen evolution from water was observed over nanocrystalline gallium oxynitride spinel under simulated solar light irradiation (320 nm < lambda < 800 nm). Up to 8 mu mol h(-1) of H-2 was evolved without co-catalyst loading. The photocatalyst was synthesized by the ammonolysis of gallium nitrate hydrate (Ga(NO3)(3)center dot xH(2)O). Optical measurements indicate an indirect gap (E-g) in the visible region (E-g = 2.50 eV) which is ascribed to photoexcitations from the N 2p valence states. A direct gap has an onset at ultraviolet energies (E-g = 3.69 eV), which is ascribed to photoexcitations from lower energy O 2p valence states.
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