Optimization of photoelectrochemical water splitting performance on hierarchical TiO2 nanotube arrays

被引：310

作者：

Zhang, Zhonghai ^{[1
]}

Wang, Peng ^{[1
]}

机构：

[1] King Abdullah Univ Sci & Technol, Water Desalinat & Reuse Ctr, Chem & Life Sci & Engn Div, Thuwal 239556900, Saudi Arabia

来源：

ENERGY & ENVIRONMENTAL SCIENCE | 2012年 / 5卷 / 04期

关键词：

HYDROGEN GENERATION; NANOWIRE ARRAYS; THIN-FILMS; ANODIZATION; TITANIUM; CELLS;

D O I：

10.1039/c2ee03461a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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

引用

页码：6506 / 6512

页数：7

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