Synthesis of Ta3N5 nanotube arrays modified with electrocatalysts for photoelectrochemical water oxidation
- Synthesis of Ta3N5 nanotube arrays modified with electrocatalysts for photoelectrochemical water oxidation
- Yanqing Cong; 박현서; Shijun Wang; Hoang X Dang; Fu-Ren F Fan; C Buddie Mullins; Allen J Bard
- Issue Date
- The Journal of Physical Chemistry C
- VOL 116, NO 27, 14541-14550
- Nanostructured Ta3N5 photoanodes (band gap of ∼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 (∼73 mW/cm2), a 100 nm nanoporous Ta3N5 electrode achieved an anodic photocurrent of ∼1.4 mA/cm2 at +0.5 V versus Ag/AgCl in 1 M KOH solution. By comparison, a dense film achieved ∼0.4 mA/cm2 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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