Ta3N5 nanotube arrays for visible light water photoelectrolysis.

Nano letters (2010-02-12)
Xinjian Feng, Thomas J Latempa, James I Basham, Gopal K Mor, Oomman K Varghese, Craig A Grimes
摘要

Tantalum nitride (Ta3N5) has a band gap of approximately 2.07 eV, suitable for collecting more than 45% of the incident solar spectrum energy. We describe a simple method for scale fabrication of highly oriented Ta3N5 nanotube array films, by anodization of tantalum foil to achieve vertically oriented tantalum oxide nanotube arrays followed by a 700 degrees C ammonia anneal for sample crystallization and nitridation. The thin walled amorphous nanotube array structure enables transformation from tantalum oxide to Ta3N5 to occur at relatively low temperatures, while high-temperature annealing related structural aggregation that commonly occurs in particle films is avoided. In 1 M KOH solution, under AM 1.5 illumination with 0.5 V dc bias typical sample (nanotube length approximately 240 nm, wall thickness approximately 7 nm) visible light incident photon conversion efficiencies (IPCE) as high as 5.3% were obtained. The enhanced visible light activity in combination with the ordered one-dimensional nanoarchitecture makes Ta3N5 nanotube arrays films a promising candidate for visible light water photoelectrolysis.

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钽, foil, 100x100mm, thickness 0.100mm, annealed, 99.9%
钽, foil, 10mm disks, thickness 0.0125mm, 99.9%
钽, foil, 100x100mm, thickness 0.125mm, annealed, 99.9%
钽, foil, 10mm disks, thickness 0.05mm, annealed, 99.9%
钽, foil, 10mm disks, thickness 0.075mm, annealed, 99.9%
钽, foil, 10mm disks, thickness 0.100mm, annealed, 99.9%
钽, foil, 10mm disks, thickness 0.125mm, annealed, 99.9%
钽, foil, 10mm disks, thickness 0.15mm, annealed, 99.9%
钽, foil, 10mm disks, thickness 0.20mm, annealed, 99.9%
钽, foil, 10mm disks, thickness 0.25mm, annealed, 99.9%
钽, foil, 10mm disks, thickness 0.25mm, annealed, 99.99%
钽, foil, 10mm disks, thickness 0.5mm, annealed, 99.9%
钽, foil, 10mm disks, thickness 0.75mm, annealed, 99.9%
钽, foil, 15mm disks, thickness 0.006mm, 99.9%
钽, foil, 15mm disks, thickness 0.0075mm, 99.9%
钽, foil, 15mm disks, thickness 0.009mm, 99.9%
钽, foil, 15mm disks, thickness 0.0125mm, 99.9%
钽, foil, 15mm disks, thickness 0.015mm, 99.9%
钽, foil, 15mm disks, thickness 0.01mm, 99.9%
钽, foil, 15mm disks, thickness 0.025mm, as rolled, 99.9%
钽, foil, 15mm disks, thickness 0.02mm, 99.9%
钽, foil, 15mm disks, thickness 0.034mm, as rolled, 99.9%
钽, foil, 15mm disks, thickness 0.03mm, as rolled, 99.9%
钽, foil, 15mm disks, thickness 0.05mm, annealed, 99.9%
钽, foil, 15mm disks, thickness 0.075mm, annealed, 99.9%
钽, foil, 15mm disks, thickness 0.100mm, annealed, 99.9%
钽, foil, 15mm disks, thickness 0.125mm, annealed, 99.9%
钽, foil, 15mm disks, thickness 0.15mm, annealed, 99.9%
钽, foil, 15mm disks, thickness 0.20mm, annealed, 99.9%
钽, foil, 15mm disks, thickness 0.25mm, annealed, 99.9%