A photoelectrochemical investigation of the hydrogen-evolving doped TiO2 nanotube arrays electrode
| Autor: | Ma Chong-fang, Zhang Zhi-yu, Bai Guang-mei, Du Chunxu, Li-xia Sang |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Nanotube
Materials science Hydrogen Renewable Energy Sustainability and the Environment Doping Energy Engineering and Power Technology chemistry.chemical_element Nanotechnology Electrolyte Condensed Matter Physics Dielectric spectroscopy chemistry.chemical_compound Fuel Technology chemistry Chemical engineering Electrode Fluoride Hydrogen production |
| Zdroj: | International Journal of Hydrogen Energy. 37:854-859 |
| ISSN: | 0360-3199 |
| Popis: | The present work investigates the photoelectrochemical behavior of nanotubular N/C-TiO 2 electrode for hydrogen production. Via the sonoelectrochemical anodization process of 1 h, N-containing TiO 2 based nanotube arrays(N-TNT) with the length of about 650 nm were fabricated in fluoride aqueous solution added 0.25 M NH 4 NO 3 ; C-containing TiO 2 based nanotube arrays(C-TNT) with the length of about 2 μm were prepared in fluoride ethylene glycol solution. In virtue of the longer tubes with the larger surface areas, C-TNT can harvest more light and produce more photoactive sites than N-TNT, which also made the charge transfer resistance in C-TNT larger than that in N-TNT. Considered the more negative flat band potential of C-TNT, C-TNT has the smaller energy barrier and the better photoelectrochemical activity. It may be attributed to the appropriate defect concentration gradient owing to the modification of C element. Under UV–vis light (320–780 nm) irradiation, the average hydrogen generation rate of C-TNT was 282 μL h −1 cm −2 . The surface properties and near-surface properties of the resultant electrode were synthetically analyzed by using UV–vis diffuse reflectance spectra(DRS), field emission scanning electron microscopy (FESEM), I-t curves, and electrochemical impedance spectroscopy (EIS) techniques. |
| Databáze: | OpenAIRE |
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