Optimization of photoelectrochemical water splitting performance on hierarchical TiO2 nanotube arrays

Zhonghai Zhang; Peng Wang

doi:10.1039/c2ee03461a

Optimization of photoelectrochemical water splitting performance on hierarchical TiO₂ nanotube arrays

Zhonghai Zhang
, Peng Wang^*

^*Corresponding author for this work

King Abdullah University of Science and Technology

Research output: Contribution to journal › Article › peer-review

326 Scopus citations

Abstract

In this paper, we show that by varying the voltages during two-step anodization the morphology of the hierarchical top-layer/bottom-tube TiO ₂ (TiO₂ 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 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.

Original language	English
Pages (from-to)	6506-6512
Number of pages	7
Journal	Energy and Environmental Science
Volume	5
Issue number	4
DOIs	https://doi.org/10.1039/c2ee03461a
State	Published - Apr 2012
Externally published	Yes

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title = "Optimization of photoelectrochemical water splitting performance on hierarchical TiO2 nanotube arrays",

abstract = "In this paper, we show that by varying the voltages during two-step anodization the morphology of the hierarchical top-layer/bottom-tube TiO 2 (TiO2 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 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.",

author = "Zhonghai Zhang and Peng Wang",

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doi = "10.1039/c2ee03461a",

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AB - In this paper, we show that by varying the voltages during two-step anodization the morphology of the hierarchical top-layer/bottom-tube TiO 2 (TiO2 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 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.

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DO - 10.1039/c2ee03461a

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EP - 6512

JO - Energy and Environmental Science

JF - Energy and Environmental Science

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ER -

Optimization of photoelectrochemical water splitting performance on hierarchical TiO₂ nanotube arrays

Abstract

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