Optimization of photoelectrochemical water splitting performance on hierarchical TiO2 nanotube arrays

Zhonghai Zhang, Peng Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

260 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 languageEnglish
Pages (from-to)6506-6512
Number of pages7
JournalEnergy and Environmental Science
Volume5
Issue number4
DOIs
Publication statusPublished - Apr 2012
Externally publishedYes

ASJC Scopus subject areas

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

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