In this presentation, we show by varying voltages  in two-step anodization the morphology of the hierarchical top-layer/bottom-tube TiO2 (TiO2 NTs)  can be finely tuned among nanoring/nanotube, nanopore/nanotube, and nanohole-nanocave/nanotube, which allows us to optimize the photoelectrochemical (PEC) water splitting performance on these hierarchical TiO2 NTs. The optimized photocurrent density and photoconversion efficiency in this study, occurring on the nanopore/nanotube TiO2 NTs, were 1.59 mA cm-2 at 1.23 V vs RHE and 0.84% respectively, which are the highest values ever reported on pristine TiO2 materials under illumination of AM 1.5G. Our findings contribute to further improvement of the energy conversion efficiency of TiO2-based devices.

Optimization of photoelectrochemical water splitting performance on hierarchical TiO<sub>2</sub> nanotube arrays

244th National Meeting (2012)

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Optimization of photoelectrochemical water splitting performance on hierarchical TiO2 nanotube arrays

Optimization of photoelectrochemical water splitting performance on hierarchical TiO₂ nanotube arrays