Passivated n-p co-doping of niobium and nitrogen into self-organized TiO2 nanotube arrays for enhanced visible light photocatalytic performance

Zhengchao Xu, Weiyi Yang, Qi Li, Shian Gao, Jian Ku Shang

Research output: Contribution to journalArticlepeer-review

Abstract

Passivated n-p co-doping of niobium and nitrogen was successfully incorporated into self-organized TiO2 nanotube arrays by anodizing Ti-Nb alloys, followed with the heat treatment in a flow of ammonia gas. Nb was doped into TiO2 nanotube arrays during the anodization by substituting Ti4+ with Nb5+, while N was doped into TiO2 nanotube arrays during the heat treatment by substituting O2- with N3-. Since Nb in TiO2 enhanced the adsorption of NH3 molecules onto the nanotube arrays, Nb doping was found to promote the subsequent N doping into the anatase lattice. As predicted by first-principles band structure calculations, Nb/N co-doped titanium oxide nanotube arrays demonstrated a largely enhanced visible light response and visible light photocatalytic performance on the degradation of methylene blue, compared to TiO2 nanotube arrays or TiO2 nanotube arrays with either dopant. The passivated n-p co-doping approach may also be applied to other material systems and promise a wide range of technical applications.

Original languageEnglish (US)
Pages (from-to)343-352
Number of pages10
JournalApplied Catalysis B: Environmental
Volume144
DOIs
StatePublished - Jan 2014

Keywords

  • Enhanced visible light photocatalytic performance
  • Niobium
  • Nitrogen
  • Passivated n-p co-doping

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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