1. Growth of polyaniline on TiO2 tetragonal prism arrays as electrode materials for supercapacitor.
- Author
-
Chen, Shaoyun, Liu, Ben, Zhang, Xingying, Chen, Fang, Shi, Hong, Hu, Chenglong, and Chen, Jian
- Subjects
- *
SUPERCAPACITOR electrodes , *DEIONIZATION of water , *ENERGY storage - Abstract
Abstract In this study, the method of hydrothermal synthesis is introduced to prepare the titanium dioxide (i.e.,TiO 2) tetragonal prism array on the conducting plane of fluorine-doped tin oxide (i.e., FTO), and then the polyaniline (i.e., PANI) is coated on the surface of TiO 2 array by normal chemical oxidation to form the PANI/TiO 2 shell/core nanoarray. The array architecture of PANI/TiO 2 composite is further confirmed by SEM, XPS, XRD, UV–vis and Raman spectroscopy. The regular array structure of PANI/TiO 2 can reduce the resistance of ionic diffuse and charge transfer via optimizing the ionic diffusion to obtain a lower impedance and higher specific capacitance. Compared with the individual component (PANI or TiO 2), the PANI/TiO 2 /FTO electrode possesses a higher specific capacitance as the supercapacitor electrode material. The maximum specific capacitances of 633 F/g at the rate of 10 mV/s and 781 F/g at the current density of 1 A/g are obtained in the PANI/TiO 2 /FTO electrode and it is superior or close to individual PANI or PANI-based materials. In addition, the TiO 2 array can undertake some mechanical deformation in the redox process without destroying the electrode material to enhance the cyclic stability of PANI/TiO 2 /FTO electrode. The capacitance retention of PANI/TiO 2 /FTO electrode keeps 75% of its initial value which is higher than that of the PANI/FTO electrode (65%) after 2000 cycles. Therefore, such array architecture composite can be promisingly used as the electrode material for electrochemical capacitive energy storage. Graphical abstract The array architecture of PANI/TiO 2 shell/core composite was successful prepared onto the conducting plane of ITO. The PANI/TiO 2 shell/core array can reduce the resistance of ionic diffuse and charge transfer via optimizing the ionic diffusion to obtain lower impedance and a higher specific capacitance. The maximum specific capacitance of 633 F/g at rate of 10 mV/s and 781 F/g at 1 A/g are obtained in the PAN/TiO 2 /FTO electrode and it is superior or close to individual PANI or PANI-based materials. Image 10723 Highlights • The PANI/TiO 2 shell/core array was successful prepared onto the conducting plane of the ITO. • The specific capacitance of 781 F/g was obtained when PANI/TiO 2 acted as the electrode. • The cycling stability with capacitance retentions of 75% after 2000 cycles. • The PAN/TiO 2 shell/core array can reduce the resistance of ionic diffuse and charge transfer. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF