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

4 Citations (Scopus)

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 - Jan 1 2018

Fingerprint

Photocatalysts
Photons
Doping (additives)
Electrons
Photocatalysis
Nanosheets
Methylene Blue
Photodegradation
Oxygen vacancies
Ultrashort pulses
Energy conversion
Electronic properties
Nanocrystals
Laser pulses
Nanocomposites
Energy gap
Ethanol
Optical properties
Semiconductor materials
Nanoparticles

ASJC Scopus subject areas

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

Cite this

Redox shuttle enhances nonthermal femtosecond two-photon self-doping of rGO-TiO2-: X photocatalysts under visible light. / Ran, Peng; Jiang, Lan; Li, Xin; Zuo, Pei; Li, Bo; Li, Xiaojie; Cheng, Xiaoyan; Zhang, Jiatao; Lu, Yongfeng.

In: Journal of Materials Chemistry A, Vol. 6, No. 34, 01.01.2018, p. 16430-16438.

Research output: Contribution to journalArticle

Ran, Peng ; Jiang, Lan ; Li, Xin ; Zuo, Pei ; Li, Bo ; Li, Xiaojie ; Cheng, Xiaoyan ; Zhang, Jiatao ; Lu, Yongfeng. / Redox shuttle enhances nonthermal femtosecond two-photon self-doping of rGO-TiO2-: X photocatalysts under visible light. In: Journal of Materials Chemistry A. 2018 ; Vol. 6, No. 34. pp. 16430-16438.
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