Surface Characteristic Effect of Ag/TiO2 Nanoarray Composite Structure on Supercapacitor Electrode Properties

Jie Cui; Lin Cao; Dahai Zeng; Xiaojian Wang; Wei Li; Zhidan Lin; Peng Zhang

doi:10.1155/2018/2464981

Surface Characteristic Effect of Ag/TiO₂ Nanoarray Composite Structure on Supercapacitor Electrode Properties

Scanning. 2018 Jul 24:2018:2464981. doi: 10.1155/2018/2464981. eCollection 2018.

Authors

Jie Cui¹, Lin Cao², Dahai Zeng², Xiaojian Wang², Wei Li², Zhidan Lin², Peng Zhang²

Affiliations

¹ Analytical and Testing Center of SCUT, South China University of Technology, Guangzhou 510640, China.
² Institute of Advanced Wear & Corrosion Resistant and Functional Materials, Jinan University, Guangzhou 510632, China.

Abstract

Ag-ion-modified titanium nanotube (Ag/TiO₂-NT) arrays were designed and fabricated as the electrode material of supercapacitors for electrochemical energy storage. TiO₂ nanotube (NT) arrays were prepared by electrochemical anodic oxidation and then treated by Ag metal vapor vacuum arc (MEVVA) implantation. The Ag amount was controlled via adjusting ion implantation parameters. The morphology, crystallinity, and electrochemistry properties of as-obtained Ag/TiO₂-NT electrodes were distinguished based on various characterizations. Compared with different doses of Ag/TiO₂-NTs, the electrode with the dose of 5.0 × 10¹⁷ ions·cm^-2 exhibited much higher electrode capacity and greatly enhanced activity in comparison to the pure TiO₂-NTs. The modified electrode showed a high capacitance of 9324.6 mF·cm^-3 (86.9 mF·g, 1.2 mF·cm^-2), energy density of 82.8 μWh·cm^-3 (0.8 μWh·g, 0.0103 μWh·cm^-2), and power density of 161.0 mW·cm^-3 (150.4 μW·g, 2.00 μW·cm^-2) at the current density of 0.05 mA. Therefore, Ag/TiO₂-NTs could act as a feasible electrode material of supercapacitors.