Optimization of photoelectrochemical water splitting performance on hierarchical TiO 2 nanotube arrays

Zhonghai Zhang, Peng Wang

Research output: Contribution to journalArticlepeer-review

260 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 (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.
Original languageEnglish (US)
Pages (from-to)6506
JournalEnergy & Environmental Science
Volume5
Issue number4
DOIs
StatePublished - Feb 10 2012

ASJC Scopus subject areas

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

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