Citation: HUANG Ye, LIU Yu-Yang, LI Wen-Zhang, CHEN Qi-Yuan. Effects of Calcination Temperature on Morphologies and Photoelectrochemical Properties of Anodized WO₃ Nanoporous Films[J]. Acta Physico-Chimica Sinica, ;2012, 28(04): 865-870. doi: 10.3866/PKU.WHXB201202152 shu

Effects of Calcination Temperature on Morphologies and Photoelectrochemical Properties of Anodized WO₃ Nanoporous Films

1.
Key Laboratory of Resources Chemistry of Nonferrous Metals Ministry of Education, School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China

Received Date: 2 December 2011
Available Online: 15 February 2012
Fund Project: 国家高技术研究发展计划项目(863) (2011AA050528) (863) (2011AA050528)国家自然科学基金(51072232, 21171175)资助 (51072232, 21171175)

Visible-light-responsive WO₃ porous films were synthesized via step-voltage anodization in NH₄F/(NH₄)₂SO₄ solution and calcined at various temperatures. The crystalline phase and surface morphology were characterized using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The as-anodized nanoporous films converted to a monoclinic phase with preferential orientation in the (020) planes, and the pore diameters of the films calcined below 450 °C were estimated to be in the region of 50-100 nm. The photocatalytic activity was evaluated via photodegradation of methyl orange. The film calcined at 450 °C showed the highest photocatalytic activity. Photoelectrochemical measurements showed that the incident photon-to-current conversion efficiency (IPCE) values of the film calcined at 450 ° C were 87.4% at 340 nm and 22.1% at 400 nm. Under visible light (λ ≥400 nm), the photocurrent density in 0.5 mol·L^-1 H₂SO₄ solution at 1.2 V (vs Ag/AgCl (KCl saturated)) was 5.11 mA·cm^-2. Electrochemical impedance spectroscopy (EIS) measurements showed that the film calcined at 450 °C exhibited the smallest interface charge transfer resistance and optimal electroconductivity. Perfect crystallinity, high porosity and low resistance can therefore be obtained by controlling the calcination temperature. A large surface area and a porous structure are important factors in affecting photocatalytic activity.
- Tungsten oxide porous film,
- Photoelectrochemical property,
- Photodegradation,
- Incident photon-to-current conversion efficiency
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Effects of Calcination Temperature on Morphologies and Photoelectrochemical Properties of Anodized WO3 Nanoporous Films

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通讯作者: 陈斌, bchen63@163.com

Effects of Calcination Temperature on Morphologies and Photoelectrochemical Properties of Anodized WO₃ Nanoporous Films