In recent years, tantalum oxynitride (TaON) semiconductor as one of the most efficient photocatalysts has been studied intensively owing to the appropriate potentials for overall solar water splitting. In this work, ZnS/CdS/-TaON composite photocatalysts with wide light response were successfully prepared by nitridation of Ta2O5 at 800 degrees C in a wet NH3 flowing and subsequently deposition CdS and ZnS quantum dots. The powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflection spectroscopy (DRS), N-2 adsorption-desorption isothermals, X-ray photoelectron spectroscopy (XPS), and so on. The photocatalytic property for hydrogen production was also studied. The results indicated that CdS and ZnS quantum dots with a diameter of 3-8nm were uniformly dispersed on the surface of -TaON, which enlarged the spectral response of the ZnS/CdS/-TaON photocatalysts. And the optimized H-2 evolution rate of ZnS/CdS/-TaON composite (839.6molh(-1)g(-1)) is about 14 times higher than that of CdS/-TaON in the absence of any noble-metal cocatalyst and 47 times higher than that of Pt loaded -TaON sample. The enhanced photocatalytic activity is attributed to the higher separation efficiency of electrons and holes with the heterogeneous junction between ZnS, CdS, and -TaON. Besides, the presence of -TaON and ZnS also prevent the photocorrosion of CdS. The results provide a new insight for developing the TaON-based nanocomposite photocatalysts with enhanced stability and excellent photocatalytic H-2 production activity. [GRAPHICS] . HighlightsZnS/CdS/-TaON nanocomposite photocatalysts had been successfully fabricated though deposition of CdS and ZnS quantum dots over -TaON nanoparticles.CdS and ZnS/CdS significantly improve the photocatalytic activity of -TaON.The optimized H2 evolution rate of ZnS/CdS/-TaON composite is about 14 times higher than that of CdS/-TaON in the absence of any noble metal cocatalyst and 47 times higher than that of Pt loaded -TaON sample.The band structures and the possible transfer mechanism were proposed.
机构:
Xi An Jiao Tong Univ, Int Res Ctr Renewable Energy, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R ChinaXi An Jiao Tong Univ, Int Res Ctr Renewable Energy, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China
Su, Jinzhan
Zhang, Tao
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Xi An Jiao Tong Univ, Int Res Ctr Renewable Energy, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R ChinaXi An Jiao Tong Univ, Int Res Ctr Renewable Energy, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China
Zhang, Tao
Wang, Lu
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Xi An Jiao Tong Univ, Int Res Ctr Renewable Energy, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R ChinaXi An Jiao Tong Univ, Int Res Ctr Renewable Energy, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China
Wang, Lu
Shi, Jinwen
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Xi An Jiao Tong Univ, Int Res Ctr Renewable Energy, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R ChinaXi An Jiao Tong Univ, Int Res Ctr Renewable Energy, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China
Shi, Jinwen
Chen, Yubin
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Xi An Jiao Tong Univ, Int Res Ctr Renewable Energy, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R ChinaXi An Jiao Tong Univ, Int Res Ctr Renewable Energy, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China
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Yogi Vemana Univ, Dept Mat Sci & Nanotechnol, Ncmocatalysis & Solar Fuels Res Lab, Kadapa 516003, Andhra Pradesh, IndiaYogi Vemana Univ, Dept Mat Sci & Nanotechnol, Ncmocatalysis & Solar Fuels Res Lab, Kadapa 516003, Andhra Pradesh, India
Reddy, N. Lakshmana
Rao, V. Navakoteswara
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Yogi Vemana Univ, Dept Mat Sci & Nanotechnol, Ncmocatalysis & Solar Fuels Res Lab, Kadapa 516003, Andhra Pradesh, IndiaYogi Vemana Univ, Dept Mat Sci & Nanotechnol, Ncmocatalysis & Solar Fuels Res Lab, Kadapa 516003, Andhra Pradesh, India
Rao, V. Navakoteswara
Kumari, M. Mamatha
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Yogi Vemana Univ, Dept Mat Sci & Nanotechnol, Ncmocatalysis & Solar Fuels Res Lab, Kadapa 516003, Andhra Pradesh, IndiaYogi Vemana Univ, Dept Mat Sci & Nanotechnol, Ncmocatalysis & Solar Fuels Res Lab, Kadapa 516003, Andhra Pradesh, India
Kumari, M. Mamatha
Ravi, P.
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CSIR, CECRI, Cent Electrochem Res Inst, Funct Mat Div, Karaikkudi 630003, Tamil Nadu, IndiaYogi Vemana Univ, Dept Mat Sci & Nanotechnol, Ncmocatalysis & Solar Fuels Res Lab, Kadapa 516003, Andhra Pradesh, India
Ravi, P.
Sathish, M.
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CSIR, CECRI, Cent Electrochem Res Inst, Funct Mat Div, Karaikkudi 630003, Tamil Nadu, IndiaYogi Vemana Univ, Dept Mat Sci & Nanotechnol, Ncmocatalysis & Solar Fuels Res Lab, Kadapa 516003, Andhra Pradesh, India
Sathish, M.
Shankar, M. V.
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Yogi Vemana Univ, Dept Mat Sci & Nanotechnol, Ncmocatalysis & Solar Fuels Res Lab, Kadapa 516003, Andhra Pradesh, IndiaYogi Vemana Univ, Dept Mat Sci & Nanotechnol, Ncmocatalysis & Solar Fuels Res Lab, Kadapa 516003, Andhra Pradesh, India
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Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R ChinaCent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China
Huang, Sheng
Lin, Yu
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Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R ChinaCent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China
Lin, Yu
Yang, Jianhua
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Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R ChinaCent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China
Yang, Jianhua
Li, Xiangru
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Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R ChinaCent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China
Li, Xiangru
Zhang, Jun
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Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R ChinaCent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China
Zhang, Jun
Yu, Jiaguo
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Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R ChinaCent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China
Yu, Jiaguo
Shi, Honglong
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Minzu Univ China, Sch Sci, Beijing 100081, Peoples R ChinaCent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China
Shi, Honglong
Wang, Wenzhong
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Minzu Univ China, Sch Sci, Beijing 100081, Peoples R ChinaCent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China
Wang, Wenzhong
Yu, Ying
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Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R ChinaCent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China