Abstract
We report on the first fabrication of vertically oriented niobium-zirconium oxynitride nanotube arrays and their useas an attractive and robust material for visible-light-driven water oxidation. These nanotube arrays with an average diameter of ∼120nm and very short length ∼90 nm were synthesized via one-step anodization of Nb-Zr alloy sheet in NH4F-containing electrolytes.Ammonolysis of the nanotubes resulted in narrowing the bandgap energy from 3.23 to ∼2.67 eV. The Nb-Zr oxynitride nanotubearrays showed approximately an enhancement of about 1900% over that reported for thin film electrodes made of niobiumoxynitride and 3700% greater than that recorded for nitrogen-doped mesoporous Nb2O5. Mott-Schottky and the valence band XPSanalyses revealed the favorable band positions of the fabricated oxynitride nanotubes with respect to the water redox potentials withvery high charge carriers density. The photocurrent transient measurements revealed the remarkable stability of the fabricatedoxynitride nanotubes.
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