کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8014664 1517172 2018 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photoelectrochemical properties of N doped black TiO2 nanotube arrays
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Photoelectrochemical properties of N doped black TiO2 nanotube arrays
چکیده انگلیسی
TiO2 nanotube arrays (TNT) were grown by anodization on Ti foils in ethylene glycol electrolyte. After electrochemical reduction and calcination under nitrogen process, Ti3+ and interstitial N in the lattice were found by XPS and Raman test. The co-doped black TNT sample yielded a high photocurrent density of 2.54 mA·cm−2 without bias voltage, while pure TNT has photocurrent density of 0.38 mA·cm−2, it is much higher than ever reported black TiO2. The electron transport resistances decreased from 594.8 ohm·cm−2 to 274.3 ohm·cm−2 and the carrier density increased from 1.35 × 1022 cm−3 to 6.68 × 1022 cm−3 after N, Ti3+ co-doped. Valence-band XPS spectra and Mott-Schottky plot indicated that presence of interstitial N, Ti3+ state in the lattices can reduce the energy gap from 3.2 eV to about 2.0 eV. In addition, TNT cathodic polarization in 0.1 M NaH2PO4 has better photoelectrochemical properties than that in 0.5 M Na2SO4 solution.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 216, 1 April 2018, Pages 239-242
نویسندگان
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