Redox shuttle enhances nonthermal femtosecond two-photon self-doping of rGO-TiO2-: X photocatalysts under visible light

Peng Ran, Lan Jiang, Xin Li, Pei Zuo, Bo Li, Xiaojie Li, Xiaoyan Cheng, Jiatao Zhang, Yongfeng Lu

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Self-doped TiO2 has attracted intense attention in photocatalysis due to its improved solar absorption and superior activities. Here we propose an efficient femtosecond two-photon photosynthetic doping method to synthesize visible-active rGO-TiO2-x photocatalysts based on a redox shuttle mechanism. By employing ethanol molecules as the hole scavenger and GO/rGO nanosheets as the electron acceptor and transporter, the charge separation of photogenerated electron-hole pairs is substantially enhanced, suppressing the charge recombination. Consequently, oxygen vacancies and Ti3+ states are facilely introduced into the TiO2 lattice, resulting in a significantly reduced bandgap (1.62 eV). Meanwhile, benefitting from the nonthermal characteristics of a femtosecond laser in contrast to a conventional long-pulse laser, the average nanoparticle size, shape and lattice structures could be well maintained during the preparation process. The resultant rGO-TiO2-x nanocomposites exhibit superior photodegradation of methylene blue and bisphenol A under visible light. The proposed doping strategy presents a new and highly effective approach to tune the optical and electronic properties of semiconductor nanocrystals for environmental remediation and energy conversion.

Original languageEnglish (US)
Pages (from-to)16430-16438
Number of pages9
JournalJournal of Materials Chemistry A
Volume6
Issue number34
DOIs
StatePublished - 2018

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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