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Issue 34, 2018
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Redox shuttle enhances nonthermal femtosecond two-photon self-doping of rGO–TiO2−x photocatalysts under visible light

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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.

Graphical abstract: Redox shuttle enhances nonthermal femtosecond two-photon self-doping of rGO–TiO2−x photocatalysts under visible light

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Publication details

The article was received on 06 May 2018, accepted on 27 Jul 2018 and first published on 31 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA04198A
Citation: J. Mater. Chem. A, 2018,6, 16430-16438
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    Redox shuttle enhances nonthermal femtosecond two-photon self-doping of rGO–TiO2−x photocatalysts under visible light

    P. Ran, L. Jiang, X. Li, P. Zuo, B. Li, X. Li, X. Cheng, J. Zhang and Y. Lu, J. Mater. Chem. A, 2018, 6, 16430
    DOI: 10.1039/C8TA04198A

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