Enhanced Photoelectrochemical Water Splitting Performance of Titania Nanotubes by Anodization

This study examines the effect of anodization voltage (12 V, 20 V, 30 V) on the electrochemical characteristics of TiO2 nanotubes for photoelectrochemical water splitting applications. Our findings indicate that elevated anodization voltages (30 V) result in TiO2 nanotubes with markedly diminished charge transfer resistance (625 Ω) and improved photoconversion efficiency (1.42%) relative to lower voltages. Electrochemical impedance spectroscopy verifies a linear correlation between anodization voltage and barrier layer thickness of roughly 0.8 nm/V, while also exhibiting enhanced electron transport properties for the 30 V samples. The results identify anodization voltage as a critical factor for enhancing TiO2 nanotube efficacy in sustainable hydrogen production systems. This study enhances the fundamental comprehension of the influence of electrochemical anodization parameters on the characteristics and efficacy of TiO2 nanotubes, offering critical insights for the systematic design and optimization of effective photoanodes for sustainable hydrogen production via solar water splitting.