Hierarchical top-porous/bottom-tubular TiO 2 nanostructures decorated with Pd nanoparticles for efficient photoelectrocatalytic decomposition of synergistic pollutants

Zhonghai Zhang, Yanjie Yu, Peng Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

159 Citations (Scopus)

Abstract

In this paper, top-porous and bottom-tubular TiO 2 nanotubes (TiO 2 NTs) loaded with palladium nanoparticles (Pd/TiO 2 NTs) were fabricated as an electrode for an enhanced photoelectrocatalytic (PEC) activity toward organic dye decomposition. TiO 2 NTs with a unique hierarchical top-porous and bottom-tubular structure were prepared by a facile two-step anodization method and Pd nanoparticles were decorated onto the TiO 2 NTs via a photoreduction process. The PEC activity of Pd/TiO 2 NTs was investigated by decomposition of methylene blue (MB) and Rhodamine B (RhB). Because of formation Schottky junctions between TiO 2 and Pd, which significantly promoted the electron transfer and reduced the recombination of photogenerated electrons and holes, the Pd/TiO 2 NT electrode showed significantly higher PEC activities than TiO 2 NTs. Interestingly, an obvious synergy between two dyes was observed and corresponding mechanism based on facilitated transfer of electrons and holes as a result of a suitable energy level alignment was suggested. The findings of this work provide a fundamental insight not only into the fabrication but also utility of Schottky junctions for enhanced environmental remediation processes.

Original languageEnglish
Pages (from-to)990-996
Number of pages7
JournalACS Applied Materials and Interfaces
Volume4
Issue number2
DOIs
Publication statusPublished - 22 Feb 2012
Externally publishedYes

Keywords

  • Pd nanoparticles
  • photoelectrocatalysis
  • Schottsky junction
  • TiO nanotube

ASJC Scopus subject areas

  • Materials Science(all)

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