Synthesis of coral-like tantalum oxide films via anodization in mixed organic-inorganic electrolytes.

PloS one (2013-06-27)
Hongbin Yu, Suiyi Zhu, Xia Yang, Xinhong Wang, Hongwei Sun, Mingxin Huo
RESUMO

We report a simple method to fabricate nano-porous tantalum oxide films via anodization with Ta foils as the anode at room temperature. A mixture of ethylene glycol, phosphoric acid, NH4F and H2O was used as the electrolyte where the nano-porous tantalum oxide could be synthesized by anodizing a tantalum foil for 1 h at 20 V in a two-electrode configuration. The as-prepared porous film exhibited a continuous, uniform and coral-like morphology. The diameters of pores ranged from 30 nm to 50 nm. The pores interlaced each other and the depth was about 150 nm. After calcination, the as-synthesized amorphous tantalum oxide could be crystallized to the orthorhombic crystal system. As observed in photocatalytic experiments, the coral-like tantalum oxide exhibited a higher photocatalytic activity for the degradation of phenol than that with a compact surface morphology, and the elimination rate of phenol increased by 66.7%.

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

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