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

Research output: Journal article publication › Journal article › Academic research › peer-review

314 Citations (Scopus)

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
Publication status	Published - Apr 2012
Externally published	Yes

ASJC Scopus subject areas

Environmental Chemistry
Renewable Energy, Sustainability and the Environment
Nuclear Energy and Engineering
Pollution

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

More information

10.1039/c2ee03461a

Cite this

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