中国物理B ›› 2022, Vol. 31 ›› Issue (5): 58201-058201.doi: 10.1088/1674-1056/ac474a

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Photoelectrochemical activity of ZnO:Ag/rGO photo-anodes synthesized by two-steps sol-gel method

D Ben Jemia1,2, M Karyaoui1,†, M A Wederni3, A Bardaoui1, M V Martinez-Huerta4, M Amlouk5, and R Chtourou1   

  1. 1 Laboratory of Nanomaterials and Renewable Energy Systems LANSER, Research and Technology Center of Energy, Borj-Cedria Science and Technology Park, BP 95, 2050 Hammam-Lif, Tunisia;
    2 Faculty of Science of Tunis, University of Tunis El Manar, Tunisia;
    3 Laboratory of Physics of Materials and Nanomaterials Applied to the Environment (LaPhyMNE), Faculty of Sciences of Gabes, Cité Erriadh, University of Gabès, 6079 Gabes, Tunisia;
    4 lnstitute of Catalysis and Petrochemistry, CSIC, in Madrid, Spain;
    5 Laboratory of Nanomaterials, Nanotechnology and Energy (L2NE), University of Tunis El Manar, Tunisia
  • 收稿日期:2021-05-20 修回日期:2021-11-29 发布日期:2022-04-29
  • 通讯作者: M Karyaoui,E-mail:karyaoui@gmail.com E-mail:karyaoui@gmail.com
  • 基金资助:
    This work is funded by Tunisian Ministry of Higher Education and Scientific Research through the budget allowed to the implied Tunisian labs.

Photoelectrochemical activity of ZnO:Ag/rGO photo-anodes synthesized by two-steps sol-gel method

D Ben Jemia1,2, M Karyaoui1,†, M A Wederni3, A Bardaoui1, M V Martinez-Huerta4, M Amlouk5, and R Chtourou1   

  1. 1 Laboratory of Nanomaterials and Renewable Energy Systems LANSER, Research and Technology Center of Energy, Borj-Cedria Science and Technology Park, BP 95, 2050 Hammam-Lif, Tunisia;
    2 Faculty of Science of Tunis, University of Tunis El Manar, Tunisia;
    3 Laboratory of Physics of Materials and Nanomaterials Applied to the Environment (LaPhyMNE), Faculty of Sciences of Gabes, Cité Erriadh, University of Gabès, 6079 Gabes, Tunisia;
    4 lnstitute of Catalysis and Petrochemistry, CSIC, in Madrid, Spain;
    5 Laboratory of Nanomaterials, Nanotechnology and Energy (L2NE), University of Tunis El Manar, Tunisia
  • Received:2021-05-20 Revised:2021-11-29 Published:2022-04-29
  • Contact: M Karyaoui,E-mail:karyaoui@gmail.com E-mail:karyaoui@gmail.com
  • About author:2021-12-31
  • Supported by:
    This work is funded by Tunisian Ministry of Higher Education and Scientific Research through the budget allowed to the implied Tunisian labs.

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摘要： This work investigated the influence of silver plasmon and reduced graphene oxide (rGO) on the photoelectrochemical performance (PEC) of ZnO thin films synthesized by the sol-gel method. The physicochemical properties of the obtained photo-anodes were systematically studied by using several characterization techniques. The x-ray diffraction analysis showed that all samples presented hexagonal wurtzite structure with a polycrystalline nature. Raman and energy dispersive x-ray (EDX) studies confirmed the existence of both Ag and rGO in ZnO:Ag/rGO thin films. The estimated grain size obtained from scanning electron microscopy (SEM) analysis decreased with Ag doping, then increased to a maximum value after rGO addition. The UV-vis transmission spectra of the as-prepared ZnO:Ag and ZnO:Ag/rGO thin films have shown a reduction in the visible range with a redshift at the absorption edges. The bandgaps were estimated to be around 3.17 eV, 2.7 eV, and 2.52 eV for ZnO, ZnO:Ag, and ZnO:Ag/rGO, respectively. Moreover, the electrical measurements revealed that the charge exchange processes were enhanced at the ZnO:Ag/rGO/electrolyte interface, accompanied by an increase in the (PEC) performance compared to ZnO and ZnO:Ag photo-anodes. Consequently, the photocurrent density of ZnO:Ag/rGO (0.2 mA·cm-2) was around 4 and 2.22 times higher than photo-anodes based on undoped ZnO (0.05 mA·cm-2) and ZnO:Ag (0.09 mA·cm-2), respectively. Finally, from the flat band potential and donor density, deduced from the Mott-Schottky, it was clear that all the samples were n-type semiconductors with the highest carrier density for the ZnO:Ag/rGO photo-anode.

关键词: zinc oxide, reduced graphene oxide, silver doping, sol-gel, photoelectrochemical performance

Abstract: This work investigated the influence of silver plasmon and reduced graphene oxide (rGO) on the photoelectrochemical performance (PEC) of ZnO thin films synthesized by the sol-gel method. The physicochemical properties of the obtained photo-anodes were systematically studied by using several characterization techniques. The x-ray diffraction analysis showed that all samples presented hexagonal wurtzite structure with a polycrystalline nature. Raman and energy dispersive x-ray (EDX) studies confirmed the existence of both Ag and rGO in ZnO:Ag/rGO thin films. The estimated grain size obtained from scanning electron microscopy (SEM) analysis decreased with Ag doping, then increased to a maximum value after rGO addition. The UV-vis transmission spectra of the as-prepared ZnO:Ag and ZnO:Ag/rGO thin films have shown a reduction in the visible range with a redshift at the absorption edges. The bandgaps were estimated to be around 3.17 eV, 2.7 eV, and 2.52 eV for ZnO, ZnO:Ag, and ZnO:Ag/rGO, respectively. Moreover, the electrical measurements revealed that the charge exchange processes were enhanced at the ZnO:Ag/rGO/electrolyte interface, accompanied by an increase in the (PEC) performance compared to ZnO and ZnO:Ag photo-anodes. Consequently, the photocurrent density of ZnO:Ag/rGO (0.2 mA·cm-2) was around 4 and 2.22 times higher than photo-anodes based on undoped ZnO (0.05 mA·cm-2) and ZnO:Ag (0.09 mA·cm-2), respectively. Finally, from the flat band potential and donor density, deduced from the Mott-Schottky, it was clear that all the samples were n-type semiconductors with the highest carrier density for the ZnO:Ag/rGO photo-anode.

Key words: zinc oxide, reduced graphene oxide, silver doping, sol-gel, photoelectrochemical performance

中图分类号:  (Electrochemical engineering)

  • 82.47.Wx
77.55.hf (ZnO) 68.65.Pq (Graphene films) 72.80.Vp (Electronic transport in graphene)