Preparation of ternary Cr2O3–SiC–TiO2 composites for the photocatalytic production of hydrogen--颗粒学报PARTICUOLOGY

Zhang, Y., Xu, Y., Li, T., & Wang, Y. (2012). Preparation of ternary Cr2O3–SiC–TiO2 composites for the photocatalytic production of hydrogen. Particuology, 10(1), 46–50. https://doi.org/10.1016/j.partic.2011.08.001

Preparation of ternary Cr₂O₃–SiC–TiO₂ composites for the photocatalytic production of hydrogen

Yaojun Zhang ^{a b *}, Yong Xu ^{a b}, Tuo Li ^b, Yachao Wang ^{a b}

a School of Material Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
b State Key Laboratory of Architecture Science and Technology in West China (XAUAT), Xi’an University of Architecture and Technology, Xi’an 710055, China

10.1016/j.partic.2011.08.001

Volume 10, Issue 1, February 2012, Pages 46-50

Received 16 May 2011, Revised 3 August 2011, Accepted 25 August 2011, Available online 15 December 2011.

E-mail: yaojzhang@yahoo.com.cn

Highlights

Abstract

Novel ternary Cr₂O₃–SiC–TiO₂ composites were synthesized by implanting Cr³⁺ into SiC–TiO₂ via sol–gel and impregnation approaches. The results from X-ray diffraction, scanning electron microscopy and transmission electron microscopy show that the Cr³⁺ species were doped onto the surface of the SiC–TiO₂ carrier. The diffuse reflectance ultraviolet–visible absorption spectra revealed that the absorption edges of the ternary Cr₂O₃–SiC–TiO₂ composites were gradually shifted red with increasing chromium content. The luminescence intensities of the composites decreased with increasing doped Cr³⁺ content due to the reduction in the number of recombination sites of electron–hole pairs. The ternary Cr₂O₃–SiC–TiO₂ composites showed high hydrogen-producing activities, which probably results from the formation of donor levels of the Cr³⁺ species in the forbidden band of the SiC semiconductor.

Graphical abstract

Keywords

Ternary composites; Photocatalysis; Hydrogen production; Chromium species

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