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Journal of Electrochemistry ›› 2020, Vol. 26 ›› Issue (6): 844-849.  doi: 10.13208/j.electrochem.200211

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Preparations and Photoelectrochemical Performances of RGO-TiO2 Nanotubes Arrays

ZHANG Ze-Yang1, SUN Lan1,2,*(), LIN Chang-Jian1   

  1. 1. State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
    2. Shenzhen Research Institute of Xiamen University, Shenzhen 518057, Guangdong, China
  • Received:2020-02-11 Revised:2020-03-27 Online:2020-12-28 Published:2021-01-26
  • Contact: SUN Lan E-mail:sunlan@xmu.edu.cn


Decorating TiO2 nanotube arrays with RGO to improve the photocatalytic activity of TiO2 nanotube arrays has been reported. For the reported RGO-TiO2 nanotube arrays, TiO2 nanotube arrays were prepared by anodizing the high-purity Ti foil in an organic electrolyte for multiple-step treatments, while RGO were deposited on TiO2 nanotube arrays by using cyclic voltammetry or other electrical reduction methods. To enhance the reduction degree and the coverage of RGO on the resultant RGO-TiO2 nanotube arrays, in this work, the one-step electrochemical anodization in hydrofluoric acid was used to fabricate TiO2 nanotube arrays with different wall thicknesses by adjusting the distance between the cathode and anode. RGO were loaded on the surface of TiO2 nanotube arrays by pulse electroreduction deposition. When the distances between the cathode and anode were 4 and 0.5 cm, respectively, the corresponding wall thicknesses of the as-prepared TiO2 nanotubes were 8 and 14 nm, respectively. Compared with the RGO loaded on the thin-walled TiO2 nanotube arrays, the RGO loaded on the thick-walled TiO2 nanotube arrays were fully reduced and the RGO coverage was greatly improved. X-ray photoelectron spectroscopy demonstrated that the reduction degree of RGO loaded on the thick-walled TiO2 nanotube arrays was higher than that of RGO loaded on the thin-walled TiO2 nanotube arrays with the decrease of the oxygen content. UV-vis diffuse reflectance spectroscopy showed that the band gap of RGO-TiO2 nanotube arrays became narrower than that of TiO2 nanotube arrays due to the loading of RGO. The photocurrent measurements displayed that the photocurrent density of the RGO loaded thick-walled TiO2 nanotube arrays was significantly increased accordingly, showing good light absorption properties, but also lower charge transfer resistance. The method and results presented in this work would lay a good foundation for the practical photoelectrochemical catalysis application of RGO-TiO2 nanotube arrays.

Key words: TiO2 nanotube array, reduced graphene oxide, photoelectrochemical performance

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