Citation: Kayla J. Pyper, Taylor C. Evans, Bart M. Bartlett. Synthesis of α-SnWO₄ thin-film electrodes by hydrothermal conversion from crystalline WO₃[J]. Chinese Chemical Letters, ;2015, 26(4): 474-478. doi: 10.1016/j.cclet.2015.01.027 shu

Synthesis of α-SnWO₄ thin-film electrodes by hydrothermal conversion from crystalline WO₃

1.
Department of Chemistry University of Michigan, Ann Arbor, MI 48109-1055, USA

Corresponding author: Bart M. Bartlett,
Received Date: 22 December 2014
Available Online: 16 January 2015
Fund Project: This work was supported by a grant from a National Science Foundation (No. DMR-1253347). We thank the University of Michigan Department of Chemistry for a Research Excellence Fellowship awarded to K.J.P. and for summer undergraduate support awarded to T.C.E. (No. DMR-1253347)

Thin film electrodes of the orthorhombic form of tin tungstate (α-SnWO₄) were prepared using a hydrothermal method to convert thin films of WO₃ in aqueous SnCl₂. The pH dependence of the growth mechanism was identified by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The XRD patterns show complete conversion of WO₃(s) to SnWO₄(s) at pH 1, 4, and 7. SEM images reveal a morphology change from sponge-like platelets to sharp nanowires as the pH increases from 1 to 7. The α-SnWO₄ thin films were reddish brown in color, and display an indirect band gap of 1.9 eV by diffuse reflectance UV-vis spectroscopy. α-SnWO₄ is therefore solar-responsive, and a chopped light linear sweep voltammogram recorded under 100 mW/cm² AM1.5 simulated solar illumination in a pH 5 0.1 mol/L KP_i buffer show a visible light response for photoelectrochemical water oxidation, producing 32 mA/cm² at 1.23 V vs. RHE.
- Alpha tin tungstate,
- Hydrothermal conversion,
- Microstructure,
- Hydrothermal method
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Synthesis of α-SnWO4 thin-film electrodes by hydrothermal conversion from crystalline WO3

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通讯作者: 陈斌, bchen63@163.com

Synthesis of α-SnWO₄ thin-film electrodes by hydrothermal conversion from crystalline WO₃