Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 36, Pages 19225-19232Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp307369z
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Funding
- National Science Foundation [CHE-0934450, 0618242]
- Welch Foundation [F-1436, F-0021]
- Vietnam Education Foundation (VEF)
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0934450] Funding Source: National Science Foundation
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Nanostructured Ta3N5 photoanodes (band gap of similar to 2.0 eV) were synthesized via a two-step process: first, nanocolumnar Ta2O5 films were deposited by evaporation of tantalum metal in a vacuum chamber in a low pressure oxygen ambient followed by heating in an ammonia gas flow to convert Ta2O5 into orthorhombic Ta3N5. Under Xe lamp irradiation (similar to 73 mW/cm(2)), a 100 nm nanoporous Ta3N5 electrode achieved an anodic photocurrent of similar to 1.4 mA/cm(2) at +0.5 V versus Ag/AgCl in 1 M KOH solution. By comparison, a dense film achieved similar to 0.4 mA/cm(2) clearly illustrating the importance of nanostructuring for improving the performance of Ta3N5 photoanodes. However, Ta3N5 films suffered from inherent self-oxidation under light illumination, and application of a cobalt cocatalyst layer was found to improve the stability as well as photocatalytic activity of the Ta3N5 films.
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