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Hydrothermal synthesis of rutile/anatase TiO2 mixed crystal from potassium titanyl oxalate: crystal structure and formation mechanism

Abstract

Nowadays, rutile TiO2 or anatase TiO2 has been prepared from titanium oxalate, but there are few reports on the rutile/anatase TiO2 mixed crystal. In this work, with potassium titanyl oxalate as titanium source, the titanium oxalate [Ti2O3(H2O)2(C2O4)·H2O] has been prepared by one-step hydrothermal method at 120°C. When the temperature was raised to 150°C, the durian-shaped rutile/anatase TiO2 mixed crystal had been obtained, with anatase phase about 42.5%. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope(TEM), thermal gravity analysis (TG) and differential thermal analysis (DTA). The crystal structures of the products were simulated and the formation mechanism of the products was discussed. Photocurrent densities of 19.47μA/cm2 were obtained under the illumination of rutile/anatase TiO2 mixed crystal photoelectrodes. The nanostructure of rutile/anatase TiO2 mixed crystal is formed by epitaxial growth of titanium oxalate along specific surfaces, and all crystal structures and the connection mode of TiO6 octahedron are similar.

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Publication details

The article was received on 01 Mar 2018, accepted on 14 May 2018 and first published on 15 May 2018


Article type: Paper
DOI: 10.1039/C8CE00330K
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Hydrothermal synthesis of rutile/anatase TiO2 mixed crystal from potassium titanyl oxalate: crystal structure and formation mechanism

    K. Hu, L. E, D. Zhao, C. Hu, J. Cui, L. Lai, Q. Xiong and Z. Liu, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00330K

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