Studies into the Yb-doping effects on photoelectrochemical properties of WO3 photocatalysts

Siao Li Liew; Gomathy Sandhya Subramanian; Chin Seng Chua; He-Kuan Luo

doi:10.1039/C5RA26254B

Studies into the Yb-doping effects on photoelectrochemical properties of WO₃ photocatalysts

Siao Li Liew,*^a Gomathy Sandhya Subramanian,^a Chin Seng Chua^a and He-Kuan Luo*^a

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* Corresponding authors

^a Institute of Materials Research and Engineering, Agency for Science, Technology and Research, 2 Fusionopolis Way, #08-03, Innovis, Singapore 138634
E-mail: sl-liew@imre.a-star.edu.sg, luoh@imre.a-star.edu.sg

Abstract

Yb-doped WO₃ photocatalysts were prepared by co-sputtering Yb and WO₃ on FTO glass and then sintering at elevated temperatures in air. At sintering temperatures between 450 and 550 °C, the photocurrent densities of Yb-doped WO₃ photocatalysts were higher and more stable than those of pristine WO₃ photocatalysts. The Yb-doping effects on the photoelectrochemical properties were investigated using Raman, transient absorption and electrochemical impedance spectroscopies. Compared to pristine WO₃ photocatalysts, Yb-doped photocatalysts sintered at up to 550 °C consist of sub-stoichiometric WO_3−x due to the substitution of W⁶⁺ cations with Yb³⁺ dopants, displaying shorter electron–hole recombination times and higher levels of donor densities.

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Publication details

The article was received on 28 Jan 2016, accepted on 04 Feb 2016 and first published on 05 Feb 2016

Article type: Paper

DOI: 10.1039/C5RA26254B

Author version available: Download Author version (PDF)

Citation: RSC Adv., 2016,6, 19452-19458

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Studies into the Yb-doping effects on photoelectrochemical properties of WO₃ photocatalysts

S. L. Liew, G. S. Subramanian, C. Seng Chua and H. Luo, RSC Adv., 2016, 6, 19452
DOI: 10.1039/C5RA26254B
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Studies into the Yb-doping effects on photoelectrochemical properties of WO₃ photocatalysts

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Studies into the Yb-doping effects on photoelectrochemical properties of WO₃ photocatalysts

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