Citation: XIE Fangxia, HE Xueming, LYU Yanming, YU Jinghu, WU Meiping. Electrochemical Behavior of Tantalum Pentachloride in 1-Butyl-3-methylimidazolium Hexafluorophosphate Ionic Liquid[J]. Chinese Journal of Applied Chemistry, ;2016, 33(9): 1093-1098. doi: 10.11944/j.issn.1000-0518.2016.09.150408 shu

Electrochemical Behavior of Tantalum Pentachloride in 1-Butyl-3-methylimidazolium Hexafluorophosphate Ionic Liquid

1.
Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, School of Mechanical Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China

Corresponding author: XIE Fangxia,
Received Date: 23 November 2015
Available Online: 18 February 2016
Fund Project:

The electrochemical behavior of 0.25 mol/L tantalum pentachloride is investigated in 1-butyl-3-methylimidazolium hexafluorophosphate([Bmim]PF₆) by cyclic voltammetry. The results show that the electrodeposition process of tantalum is a two-step irreversible electrode reaction by diffusion control. Tantalum(Ⅴ) is first reduced to tantalum(Ⅲ), and tantalum(Ⅲ) is further reduced to tantalum metal and tantalum subchloride. The cathodic transfer coefficients of Ta(Ⅴ)/Ta(Ⅲ) and Ta(Ⅲ)/Ta are 0.155 and 0.406, respectively. The diffusion coefficient of Ta(Ⅴ) is 1.629×10^-9 cm²/s. The electrodeposition of tantalum on platinum substrate from TaCl₅-[Bmim]PF₆ is performed using the potentiostatic method at 100℃ and -1.25 V.SEM and EDS analysis results indicate that the electrodeposits are mixtures of tantalum metal and tantalum subchiloride.
- tantalum pentachloride,
- ionic liquid,
- electrochemistry,
- electrodeposition
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沈阳化工大学材料科学与工程学院沈阳 110142