Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7711908 | International Journal of Hydrogen Energy | 2016 | 14 Pages |
Abstract
In this study, TiO2-NTs electrode was successfully fabricated by two-step anodization technique. Then, different Nano-structured Ag was loaded on the surface of as prepared TiO2-NTs using electrodeposition method at various deposition times. The morphology, composition and structure of Ag doped TiO2-NTs were determined by field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The results showed that nanoparticle and nanodentrict Ag were formed on the TiO2-NTs depending on the deposition time and the particle size of anatase TiO2 increased with increasing Ag doping concentration. To evaluate the electrocatalytic properties of Ag doped TiO2-NTs towards the hydrogen evolution reaction (HER), the cyclic voltammetry, cathodic polarization curves and impedance measurements were recorded in 1Â M KOH. The electrochemical data indicated that nanodentrict Ag doped TiO2, having the highest charge carrier density (9.02.1029Â cmâ3) as revealed by Mott-Schottky analysis, exhibits the most effective electrocatalytic activity towards the HER. In addition, long term stability of TiO2-NTs and Ag-TiO2-NTs electrodes and the energy requirement for the electrolytic hydrogen evolution were examined.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Evrim Baran, Birgül Yazici,