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Research Article

Rapidly and mildly transferring anatase phase of graphene-activated TiO2 to rutile with elevated Schottky barrier: Facilitating interfacial hot electron injection for Vis–NIR driven photocatalysis

Weiyao Hu1Qiyuan Li1Dong Xu1Guangyao Zhai1Shinan Zhang1Dong Li2Xiaoxiao He2Jinping Jia1Jiesheng Chen1Xinhao Li1( )
School of Chemistry and Chemical Engineering, Environmental Science and Engineering, and Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai 200240, China
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
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Graphical Abstract

We developed a mild but fast phase transfer method for the synthesis of graphene/rutile heterojunctions to promote the hot electron injected at the interface and final H2O2 production under visible–near infrared ray (Vis–NIR) light irradiation.

Abstract

Visible and even infrared (IR) light-initiated hot electrons of graphene (Gr) catalysts are a promising driven power for green, safe, and sustainable H2O2 synthesis and organic synthesis without the limitation of bandgap-dominated narrow light absorption to visible light confronted by conventional photocatalyst. However, the life time of photogenerated hot electrons is too short to be efficiently used for various photocatalytic reactions. Here, we proposed a straightforward method to prolong the lifetime of photogenerated hot electrons from graphene by tuning the Schottky barrier at Gr/rutile interface to facilitate the hot electron injection. The rational design of Gr-coated TiO2 heterojunctions with interface synergy-induced decrease in the formation energy of the rutile phase makes the phase transfer of TiO2 support proceed smoothly and rapidly via ball milling. The optimized Gr/rutile dyad could provide a H2O2 yield of 1.05 mM·g−1·h−1 under visible light irradiation (λ ≥ 400 nm), which is 30 times of the state-of-the-art noble-metal-free titanium oxide-based photocatalyst, and even achieves a H2O2 yield of 0.39 mM·g−1·h−1 on photoexcitation by near-infrared-region light (~ 800 nm).

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Nano Research
Pages 10142-10147
Cite this article:
Hu W, Li Q, Xu D, et al. Rapidly and mildly transferring anatase phase of graphene-activated TiO2 to rutile with elevated Schottky barrier: Facilitating interfacial hot electron injection for Vis–NIR driven photocatalysis. Nano Research, 2022, 15(12): 10142-10147. https://doi.org/10.1007/s12274-022-4624-8
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Received: 04 May 2022
Revised: 01 June 2022
Accepted: 01 June 2022
Published: 25 June 2022
© Tsinghua University Press 2022
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