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Effect of Morphology on the Photoelectrochemical Activity of TiO2 Self-Organized Nanotube Arrays

2020; Multidisciplinary Digital Publishing Institute; Volume: 10; Issue: 3 Linguagem: Inglês

10.3390/catal10030279

2073-4344

Houda Ennaceri, Kristina Fischer, Kevin Hanus, A. Chemseddine, Andrea Prager, Jan Griebel, Mathias Kühnert, Agnes Schulze, Bernd Abel,

Anodic Oxide Films and Nanostructures

In the present work, highly ordered titanium dioxide (TiO2) nanotube anodes were grown using a rapid anodization process. The photoelectrochemical performances of these electrodes strongly depend on the anodization conditions. Parameters such as electrolyte composition, anodization potential and anodization time are shown to affect the geometrical parameters of TiO2 nanotubes. The optimal anodization parameters are determined by photocurrent measurements, linear sweep voltammetry and electrochemical impedance spectroscopy. The thickness of the tube wall and its homogeneity is shown to strongly depend on the anodization potential, and the formation mechanism is discussed. This study permits the optimization of the photocurrent density and contributes to further improvement of the photoelectrochemical water-splitting performance of TiO2 nanotube photoelectrodes.