Highly Crystalline Mesoporous TiO2(B) Nanofibers

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State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China
Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China
*(K.-Y.C.) E-mail: [email protected]. Tel: +852-2859-7917.
*(X.L.) E-mail: [email protected]. Tel: +86-25-8358-8063.
Cite this: J. Phys. Chem. C 2014, 118, 6, 3049–3055
Publication Date (Web):January 13, 2014
https://doi.org/10.1021/jp408112z
Copyright © 2014 American Chemical Society
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Abstract

Efforts are being made to improve crystalline properties of the skeletons of mesoporous TiO2. On the basis of the unique crystal structures and versatile phase evolution of K2Ti2O5, we obtain mesoporous TiO2(B) nanofibers (M-NFs) with highly crystalline and high-energy facets exposed skeletons via a cheap and scalable route. Verified by X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and N2 adsorption, these special structures come from layered structure of K2Ti2O5 and subsequent interlayer splitting and exfoliating and intralayer topotactic transformation. Because of their well-organized frameworks and high surface area, M-NFs exhibit efficient photogenerated charge transportation and hydrogen production, showing better charge mobility along one-dimensional and highly crystalline skeletons than irregularly shaped polycrystalline counterpart and more accessible reactive sites due to larger surface area than single crystal nonporous counterpart.

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Summarized structural evolution and mechanism, statistic size distribution of crystallites in ion-exchanged titanate and calcinated TiO2 from SEM images, XRD pattern and SEM image of TiO2(B) from K2Ti4O9. This material is available free of charge via the Internet at http://pubs.acs.org.

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