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Issue 56, 2016, Issue in Progress
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Large-scale synthesis of stable mesoporous black TiO2 nanosheets for efficient solar-driven photocatalytic hydrogen evolution via an earth-abundant low-cost biotemplate

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Abstract

Stable mesoporous black anatase TiO2 nanosheets (MBTNs) are synthesized via an earth-abundant low-cost biotemplate method combined with an ethanediamine encircling process, and subsequent high-temperature calcinations and surface hydrogenation. The MBTNs, which can be synthesized on a large scale with a low cost, are composed of Ti3+ in frameworks and surface disorders. In this case, the employment of ethanediamine encircling plays a vital role in fabricating the stable MBTNs, and not only favors high-temperature hydrogenation (600 °C), but also retains the mesoporous network as well as inhibiting the anatase-to-rutile phase transformation and grain growth. The resultant MBTNs possess a relatively high surface area of ∼74 m2 g−1, and large pore size and pore volume of ∼10 nm and 0.15 cm3 g−1, respectively. The MBTNs, with a narrow bandgap of ∼2.85 eV, can extend the photoresponse from the ultraviolet to visible light region, and exhibit an excellent solar-driven photocatalytic hydrogen evolution rate (∼165 μmol h−1 0.05 g−1), which is about twice as high as that of pristine mesoporous TiO2 nanosheets (∼82 μmol h−1 0.05 g−1). This efficient solar-driven photocatalytic hydrogen evolution is ascribed to the synergistic effects of the highly crystalline, ultrathin 2D mesoporous structure of Ti3+ in frameworks and surface disorders.

Graphical abstract: Large-scale synthesis of stable mesoporous black TiO2 nanosheets for efficient solar-driven photocatalytic hydrogen evolution via an earth-abundant low-cost biotemplate

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Publication details

The article was received on 14 Mar 2016, accepted on 11 May 2016 and first published on 12 May 2016


Article type: Paper
DOI: 10.1039/C6RA06751D
Citation: RSC Adv., 2016,6, 50506-50512
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    Large-scale synthesis of stable mesoporous black TiO2 nanosheets for efficient solar-driven photocatalytic hydrogen evolution via an earth-abundant low-cost biotemplate

    K. Zhang, W. Zhou, X. Zhang, Y. Qu, L. Wang, W. Hu, K. Pan, M. Li, Y. Xie, B. Jiang and G. Tian, RSC Adv., 2016, 6, 50506
    DOI: 10.1039/C6RA06751D

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