CIESC Journal ›› 2020, Vol. 71 ›› Issue (10): 4663-4673.doi: 10.11949/0438-1157.20191292

• Catalysis, kinetics and reactors • Previous Articles     Next Articles

Study on diffusion-reaction coupled strengthening mechanism based on electrosynthesis of titanium dioxide nanotube array

Huang ZHOU(),Yu CHANG,Xing FAN,Nannan ZHANG(),Changyuan TAO   

  1. School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
  • Received:2019-10-30 Revised:2020-03-09 Online:2020-10-05 Published:2020-03-18
  • Contact: Nannan ZHANG E-mail:zhouhuang2019@163.com;zhangnn@cqu.edu.cn

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Abstract:

As an excellent semiconductor material, the TiO2 is widely used in the areas of photocatalysis, solar cells, and biomedical devices. Various technologies have been established to prepare TiO2 nanotube array. These technologies mainly include numerous hydrothermal methods, template method, sol-gel method, and anodic oxidation method. Among them, the anodic oxidation method attracts much attention because of its highly ordered, uniform distribution and variable structure control. At present, the modified preparation of TiO2 nanotube array is still studied by researchers. However, basic study on the kinetic mechanism of the growth process of nanotube array is rare. Herein, we proposed the diffusion-reaction coupled strengthening mechanism based on the electrosynthesis of titanium dioxide nanotube array. Furthermore, the evolution of TiO2 nanotube array with electrolysis time was investigated, and the nonlinear dynamic mechanism of TiO2 nanotube array structure growth process was discussed in combination with SEM and electrochemical impedance analysis. It was found that the formation of TiO2 nanotube array was a self-organization behavior in the diffusion-reaction coupling process of oligomer hydroxyl titanium intermediates. Moreover, the reaction kinetics mechanism was established by analyzing the electrochemical growth mechanism, and its linear stability was analyzed. Besides, the parameter threshold space formed by the ordered structure in TiO2 nanotube array and the accompanying electrochemical oscillation were explained, and its evolution process was also discussed. After optimization, TiO2 nanotube array with ordered structure was prepared. It revealed the internal mechanism of diffusion-reaction coupling in the electrosynthesis of TiO2 nanotube array. In addition, the nonlinear dynamic mechanism proposed in this paper exists widely in the electrodissolution process of various metals, which has a significant influence on the structure formation of products and the power consumption of reaction process. This also provides a theoretical basis for strengthening the batch electrosynthesis process of new nanomaterials.

Key words: titanium dioxide nanotube array, nanostructure, nonlinear kinetics, chemical reaction, electrochemical oscillation, linear stability analysis

CLC Number: 

  • TQ 134.1

Fig.1

Plot of current vs time in growth process of TiO2 nanotubes by anodization on surface of Ti electrode(a) and SEM images [(b)—(e)] of TiO2 nanotube arrays at stage(1)—(4) in Fig.1(a), respectively"

Fig.2

Plot of current vs time(a) and the SEM images [(b)—(e)] in the growth process of TiO2 nanotubes by anodization under different voltage"

Fig.3

Effect of F- concentration on the growth of TiO2 nanotubes"

Fig.4

Plot of current vs. time during growth of TiO2 nanotube arrays for varying water concentration"

Fig.5

The effects of H2O content on the growth of TiO2 nanotubes"

Fig.6

Δ0, Tr0 change with Z, Y0 respectively (k4k3 = 0.9, k1 = 0.01, k6 = 0.5)"

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