Electrochemically Doped and Hydrogen Peroxide-Treated TiO2 Nanotube Arrays as an Electrode for Supercapacitor with Excellent Cycling Stability

• Published in: Journal of the Electrochemical Society Vol. 166; no. 10; pp. A1944 - A1949
• Main Authors: Cao, Shikai, Wu, Lizhen, Huang, Wenqiang, Zhu, Xufei, Shen, Xiaoping, Song, Ye
• Format: Journal Article
• Language: English
• Published: The Electrochemical Society 2019
• ISSN: 1945-7111
• DOI: 10.1149/2.0841910jes

Ordered anodic TiO2 nanotube arrays hold great potential as electrode materials for high-performance supercapacitors. However, their poor cycle stability restricts practical applications. Here we develop a simple and successful strategy to improve their cycle stability. The TiO2 nanotube arrays are electrochemically doped in a basic solution, followed by soaking them in a hydrogen peroxide solution for a short time. The as-prepared TiO2 nanotube arrays possess a core-shell structure with an amorphous surface layer of 2-3 nm thickness. The supercapacitors made by the as-prepared TiO2 nanotube arrays exhibit an excellent cycling stability with a capacitance retention of 94.1% after 10000 cycles. The presented results make TiO2 an attractive candidate as electrode materials in high-performance supercapacitors.