Optimization of photoelectrochemical water splitting performance on hierarchical TiO 2 nanotube arrays
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
Water Desalination and Reuse Research Center (WDRC)
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AbstractIn this paper, we show that by varying the voltages during two-step anodization the morphology of the hierarchical top-layer/bottom-tube TiO 2 (TiO 2 NTs) can be finely tuned between nanoring/nanotube, nanopore/nanotube, and nanohole-nanocave/nanotube morphologies. This allows us to optimize the photoelectrochemical (PEC) water splitting performance on the hierarchical TiO 2 NTs. The optimized photocurrent density and photoconversion efficiency in this study, occurring on the nanopore/nanotube TiO 2 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 TiO 2 materials under illumination of AM 1.5G. Our findings contribute to further improvement of the energy conversion efficiency of TiO 2-based devices.
CitationZhang Z, Wang P (2012) Optimization of photoelectrochemical water splitting performance on hierarchical TiO2 nanotube arrays. Energy & Environmental Science 5: 6506. doi:10.1039/c2ee03461a.
PublisherRoyal Society of Chemistry (RSC)
JournalEnergy & Environmental Science
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