A Mathematical Model for the Growth of Anodic TiO2 Nanotubes under Higher Current Density. Issue 13 (1st January 2017)

• Record Type: Journal Article
• Authors: Zhao, Siwei; Lu, Sitong; Cui, Huimin; Yu, Dongliang; Zhang, Shaoyu; Kong, Jianshou; Zhu, Xufei
• Is Part Of: Journal of the Electrochemical Society. Volume 164:Issue 13(2017)
• Page Start: E401
• Page End: E407
• Publication Date: 2017-01-01
• Subjects: Anodization -- Mathematical model -- TiO2 nanotubes; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.1131713jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The mechanism of titanium anodization is unclear yet. The total current includes ionic and electronic currents. The ionic current drives oxide film growth and the electronic current causes oxygen bubble emission. Based on a former derivation, a mathematical model of voltage-time transient curves during galvanostatic anodizing under higher current densities (>10 mA/cm 2 ) was developed. The high-current model shares the same mechanism of oxide formation with the former low-current model, but the calculation of electric field is different. The results show high accuracy of fitted curves, and prove the linear correlation between nanotube length and ionic current. The two models vary in the applicable ranges, because the relation between ionic currents and electric field is different under high and low field.