Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (10): 2545-2554.doi: 10.3866/PKU.WHXB201606161

• ARTICLE • Previous Articles     Next Articles

Controlled Synthesis and Supercapacitive Performance of Heterostructured MnO2/H-TiO2 Nanotube Arrays

Juan XU1,3,Jia-Qin LIU2,3,*(),Jing-Wei LI2,Yan WANG3,4,Jun Lü3,4,Yu-Cheng WU3,4,*()   

  1. 1 School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, P. R. China
    2 Institute of Industry & Equipment Technology, Hefei University of Technology, Hefei 230009, P. R. China
    3 Key Laboratory of Advanced Functional Materials and Devices, Hefei 230009, P. R. China
    4 School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, P. R. China
  • Received:2016-04-12 Published:2016-09-30
  • Contact: Jia-Qin LIU,Yu-Cheng WU E-mail:jqliu@hfut.edu.cn;ycwu@hfut.edu.cn
  • Supported by:
    The project was supported by the National Natural Science Foundation of China(51402078);Natural Science Foundation of Anhui Province, China(1408085QE85);and Young Scholar Enhancement Foundation (Plan B) of HFUT, China(JZ2016HGTB0711)

Abstract:

This study used the target-controlled anodizing process for the controllable fabrication of TiO2 nanotube arrays (TiO2 NTAs) film substrate with large specific surface area and well-separated nanotubes. After annealing crystallization, TiO2 NTAs were successively functional modified by electrochemical hydrogenation and sequential chemical bath deposition of high specific capacitance MnO2 nanoparticles onto both the outer and inner surfaces of the nanotubes, thus constructing the heterostructured MnO2/H-TiO2 NTAs electrode. The as-prepared samples were fully characterized by field emission scanning electron microscopy (FESEM), highresolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy. The supercapacitive performance and stability of the resulting samples were systematically evaluated using electrochemical workstation. The results from the current study revealed that conductivity and electrochemical properties of H-TiO2 NTAs were dramatically enhanced through electrochemical hydrogenation and the specific capacitance of H-TiO2 NTAs could achieve 7.5 mF·cm-2 at current density of 0.2 mA·cm-2, which is almost 75 times the performance of TiO2 NTAs (0.1 mF·cm-2). Furthermore, the specific capacitance of MnO2/H-TiO2 NTAs-2 could achieve 481.26 F·g-1 at a current density of 3 mA·mg-1 as well as outstanding long-term cycling stability with only 11% reduction of initial specific capacitance at a current density of 5 mA·mg-1 after 1000 cycles.

Key words: TiO2 nanotube array, Hydrogenation, MnO2, Electrochemistry, Supercapacitive performance

MSC2000: 

  • O646