Article ID Journal Published Year Pages File Type
1513060 Energy Procedia 2012 11 Pages PDF
Abstract

Using anodic oxidation with a constant/time-dependent linearly varying anodization voltage, we have made films of cylindrical and conical-shaped titania nanotube arrays. X-ray diffraction indicates the amorphous nature of the films and annealing improves its crystalline nature. Diffuse reflectance spectra reveals the band gap of cylindrical and conical nanotubes as 3.05 and 2.8 eV respectively. Photoluminescence spectra recorded at two different excitation wavelengths reveal the existence of surface defect states. We collected the hydrogen gas for both the cylindrical andconical nanotube arrays in a 1 M KOH electrolyte with 10 vol% ethylene glycol illuminatedusing Xenon lamp.The hydrogen generation incylindrical and conical titaniananotube arrays at an illumination of 10 mW/cm2 for 1 h is 0.10 and 0.12 mL respectively.

Related Topics
Physical Sciences and Engineering Energy Energy (General)