Preparation of RuO2/ZrO2/TaON Composite Photocatalyst and Its Photocatalytic Properties for Water Splitting Hydrogen Evolution

doi:10.15541/jim20150091

Abstract

Abstract:

ZrO₂/Ta₂O₅ composite oxide powders in a fine particle size were prepared by the controlled hydrolysis method, and subsequently nitrided in a flowing ammonia at a flow rate of 90 mL/min at 850℃ for 10 h, to form ZrO₂/TaON. Then, RuO₂ co-catalyst was immobilized on the ZrO₂/TaON via an impregnation method. The samples were characterized with XRD, SEM, TEM and UV-Vis diffuse reflectance spectroscope. Both ZrO₂ and RuO₂ were in a crystallite size of ca. 10 nm, while TaON was in a crystallite size of ca. 25 nm, and composite photocatalysts absorbed the visible light at wavelength less than 500 nm. The introducing of ZrO₂ reduced the defect density of TaON and increased the specific surface area of TaON. The photocatalytic efficiency of composite photocatalysts was quantitatively evaluated via determining the photo-current density as well as in the water splitting hydrogen evolution reaction. The sample with a RuO₂ loading of 2.0wt% showed the photocurrent of 0.6 mA/cm² at a bias voltage of 0.6 V, and H₂ evolution rate as high as 6.0 μmol/h under a Xe lamp irradiation.

Key words: water splitting, hydrogen evolution, photocatalysis, RuO2/ZrO2/TaON, visible light

CLC Number:

TB321

GUO Dong-Xue, ZHANG Qing-Hong, WANG Hong-Zhi, LI Yao-Gang, CAO Guang-Xiu. Preparation of RuO₂/ZrO₂/TaON Composite Photocatalyst and Its Photocatalytic Properties for Water Splitting Hydrogen Evolution[J]. Journal of Inorganic Materials, 2015, 30(10): 1025-1030.

Figures/Tables 7

Fig. 1 XRD pattern of ZrO2/TaON nitrided at 850℃ for 10 h in a flowing NH3 of 90 mL/min

Fig. 2 UV-Vis diffuse reflectance spectra of TaON and ZrO2/ TaON

Fig. 3 FE-SEM images of Ta2O5 (a), ZrO2/TaON (b) and enlarged image (c) of rectangle area in (b)

Fig. 4 TEM (a) and HRTEM (b) images of ZrO2/TaON

Fig. 5 TEM and HRTEM images of RuO2/ZrO2/TaON with different RuO2 loadings (a) 1.0wt%; (b) 1.0wt%; (c) 2.0wt%; (d) 3.0wt%

Fig. 6 Photocurrent densities under visible light irradiation of ZrO2/TaON (a) and RuO2/ZrO2/TaON photoanodes with different RuO2 loadings, 1.0wt% (b), 2.0wt% (c) and 3.0wt%(d)

Fig. 7 Hydrogen production rates over photocatalysts ZrO2/ TaON (a) and RuO2/ZrO2/TaON with RuO2 loadings of 1.0wt% (b), 2.0wt% (c), 3.0wt% (d), and oxygen production rates over photocatalyst ZrO2/TaON with RuO2 loading of 3.0wt% (e)

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Preparation of RuO₂/ZrO₂/TaON Composite Photocatalyst and Its Photocatalytic Properties for Water Splitting Hydrogen Evolution

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